Challenges and Benefits of Standardising Early Warning Systems: A Case Study of New Zealand’s Volcanic Alert Level System
Volcano early warning systems are used globally to communicate volcano-related information to diverse stakeholders ranging from specific user groups to the general public, or both. Within the framework of a volcano early warning system, Volcano Alert Level (VAL) systems are commonly used as a simple communication tool to inform society about the status of activity at a specific volcano. Establishing a VAL system that is effective for multiple volcanoes can be challenging, given that each volcano has specific behavioural characteristics. New Zealand has a wide range of volcano types and geological settings, including rhyolitic calderas capable of very large eruptions (>500 km3) and frequent unrest episodes, explosive andesitic stratovolcanoes, and effusive basaltic eruptions at both caldera and volcanic field settings. There is also a range in eruption frequency, requiring the VAL system to be used for both frequently active ‘open-vent’ volcanoes, and reawakening ‘closed-vent’ volcanoes. Furthermore, New Zealand’s volcanoes are situated in a variety of risk settings ranging from the Auckland Volcanic Field, which lies beneath a city of 1.4 million people; to Mt. Ruapehu, the location of popular ski fields that are occasionally impacted by ballistics and lahars, and produces tephra that falls in distant cities. These wide-ranging characteristics and their impact on society provide opportunities to learn from New Zealand’s experience with VAL systems, and the adoption of a standardised single VAL system for all of New Zealand’s volcanoes following a review in 2014. This chapter outlines the results of qualitative research conducted in 2010–2014 with key stakeholders and scientists, including from the volcano observatory at GNS Science, to ensure that the resulting standardised VAL system is an effective communication tool. A number of difficulties were faced in revising the VAL system so that it remains effective for all of the volcanic settings that exist in New Zealand. If warning products are standardised too much, end-user decision making and action can be limited when unusual situations occur, e.g., there may be loss of specific relevance in the alert message. Specific decision-making should be based on more specific parameters than the VAL alone, however wider VAL system standardisation can increase credibility, a known requirement for effective warning, by ensuring that warning sources are clear, trusted and widely understood. With a credible source, user groups are less likely to look for alternatives or confirmation, leading to faster action. Here we consider volcanic warnings within the wider concept of end-to-end multi-hazard early warning systems including detection, evaluation, notification, decision-making and action elements (based on Carsell et al. 2004).
KeywordsVolcanic Alert Level Early warning system Standardisation New Zealand
1 Early Warning Systems and Standardisation
An Early Warning System (EWS) can be defined as a system designed to provide “hazard monitoring, forecasting and prediction, disaster risk assessment, communication and preparedness activities, systems and processes that enables individuals, communities, governments, businesses and others to take timely action to reduce disaster risks in advance of hazardous events” (UN 2003). They are recognized as “a means of getting information about an impending emergency, communicating that information to those that need it, and facilitating good decisions and timely response by people in danger” (Mileti and Sorensen 1990, p. 2–1). Essentially EWSs facilitate the provision of timely warnings to minimize loss of life and to reduce economic and social impact on vulnerable populations (Garcia and Fearnley 2012).
The operation of an EWS presents numerous challenges due to variations in: scale (global, national, regional, local); temporality (rapid onset, slow onset, frequent, infrequent); function (safety, property, environment); and hazard (e.g., weather, climate, geohazards). A Volcano Alert Level (VAL) system is a communication tool within a volcano EWS, which simplifies the communication of volcanologists’ interpretation of data (Newhall 2000). The VAL system is disseminated with supporting information that provides more specific details and local context to enable responding agencies, the public, and other stakeholders to make informed decisions (Fearnley 2011; Potter et al. 2014). The levels can be labelled using words, numbers, colours, and/or symbols, and summarise information from ‘background’ activity (no unrest), through to the highest level of activity (usually a large eruption) (Newhall 2000; Fearnley 2011).
Volcano observatories play a key role in the management and assignment of alert levels for volcanoes. However, with over 80 volcano observatories around the world, it is understandable that VAL systems operate in very different ways. Some provide only scientific advice on what a volcano is doing, others forecast activity, and others provide guidance on what vulnerable populations should do. There is a growing discussion globally around the role of VAL systems and whether they should be standardised, either nationally and/or internationally.
In 1989, the member states of the United Nations declared the period from 1990 to the year 2000 to be the International Decade for Natural Disaster Reduction (IDNDR) to focus attention on reducing loss of life, and social and economic disruption caused by natural disasters. Of fundamental importance was the recognition in 1991 of early warnings as a key objective of disaster reduction practices (Maskrey 1997). The United Nations has called for more effective procedures via standardisation and the application of new technologies and enhanced scientific understanding (United Nations 2006) but few hazards have an EWS operating beyond a national or regional scale. The most successful example is the Pacific Tsunami Warning Centre (PTWC), established in Hawaii in 1949. Until recently, PTWC provided Warning and Watch alert level services for numerous Pacific nations and beyond, but currently they provide nations with threat level information (e.g., wave amplitude forecasts), which the countries then use in-house to develop and disseminate specific tsunami alert levels (i.e., Warning, Watch).
The International Civil Aviation Organization (ICAO) Aviation Colour Code for volcanic activity (ICAO 2004)
ICAO Colour Code
Status of activity of volcano
Volcano is in normal, non-eruptive state
Or, after a change from a higher alert level:
Volcanic activity considered to have ceased, and volcano reverted to its normal, non-eruptive state
Volcano is experiencing signs of elevated unrest above known background levels
Or, after a change from a higher alert level:
Volcanic activity has decreased significantly but continues to be closely monitored for possible renewed increase
Volcano is exhibiting heightened unrest with increased likelihood of eruption. Or, volcanic eruption is underway with no or minor ash emission [specify ash-plume height if possible]
Eruption is forecasted to be imminent with significant emission of ash into the atmosphere likely
Or, eruption is underway with significant emission of ash into the atmosphere [specify ash-plume height if possible]
Numerous volcano observatories across the world are now implementing the ACC, and many of these are questioning the adoption of other VAL systems for ground-based hazards and reviewing their volcano early warning systems. This includes reviewing the effectiveness of VAL issuances, as Winson et al. (2014, p. 12) invite “countries to perform their own self-evaluation and weigh the cost of a higher number of alerts against the benefit of a higher accuracy in VAL issuances and to decide how to proceed accordingly with their own local populations”.
simplicity through application of common language, frameworks and understanding;
clarity for emergency responders;
reduced workload for monitoring and emergency management agencies, including education and outreach;
interoperability of equipment and systems across hazards, and across agencies, countries or internationally.
Warning messages with specific language and approaches can benefit from standardisation. In doing so, it is advisable to publish and make accessible the definitions of technical volcanic terms, and of the words ‘risk’ and ‘hazard’ as used by the scientists. This is to ensure local users understand the intention behind the scientist’s use of the terms. For example, calculation of ‘hazard’ can be based on previous events, deterministic and/or probabilistic approaches, and should be described. In addition, the communication of likelihood/probability can also be a point of confusion; ideally numeric values should be mapped against qualitative descriptions and both presented together (e.g., Doyle and Potter 2016). Standardisation can also increase credibility, a known requirement for effective warning, by producing warnings that are clear, and from a trusted source. With a credible source user groups are less likely to look for alternatives or confirmation, leading to faster action. However, end-user decision making and action can be limited in terms of contingent-specific-needs if warning products are standardised too much (e.g., depending on a user’s ability to read different types of maps (Haynes et al. 2007); or loss of meaning or relevance in the warning within a local context).
Technical: Equipment type, deployment (distribution/location/density), telemetry (radio, wire, internet etc.), visualization (software packages) and analysis all receive some level of standardisation through manufacturing standards, detection limits, and international scientific best practice.
Analytical tools: Analysis may be further structured through statistical approaches such as expert elicitation, Bayesian event trees or Bayesian belief networks.
Warning tools: Notification may be standardised through message content (e.g., standard messages, terminology, alert level criteria), packaging (e.g., bulletins, alert levels, maps) and delivery channels (e.g., phone, internet, siren). Some standards lend interoperability, such as a Common Alerting Protocol.
Response: Decision-making and action by the end-user can be standardised to some extent through communication and education approaches and message content.
the realities of varied volcanic systems, each being geophysically unique when examined in detail. The diversity and uncertain nature of numerous hazards that can occur at different temporal and spatial scales require specific EWSs to be developed.
varied end-users with different needs and perspectives for their decision-making, in terms of the level of volcanic activity, and timing thresholds for response actions.
multiple local social and cultural contexts and constraints, which presents challenges in relation to the applicability and responsiveness of EWSs to local knowledge and context.
Scientific Alert Level table introduced in 1994 (sourced from Annexe C from the CDEM Plan)
Abnormal seismic, hydrothermal or other signatures
Initial sign of volcano reawakening.
No eruption imminent.
Possible minor activity
Increase in seismic, hydrothermal and other unrest indicators. Increase from usual background weak eruptions
Indicators of intrusion process or significant change in on-going eruptive activity
Relatively high and increasing unrest shown by all indicators.
Commencement of minor eruptive activity at reawakening vent(s) or increased vigour of on-going activity
If increasing trends continue there is a real possibility of hazardous eruptive activity
Rapid acceleration of unrest indicators. Established magmatic activity at reawakening vents or significant change to on-going activity
Hazardous volcanic eruption is now imminent
Hazardous volcanic eruption in progress
Destruction within the Permanent Danger Zone (red zone) and significant risk over wider areas
This chapter focuses on the standardisation of VAL systems using the case study of New Zealand in the revision of the VAL system in 2014, to explore the benefits and challenges in implementing a nationally standardised VAL system. Reflections upon its success will help inform others as to why the devised national alert level in New Zealand is best placed for their nation, and why perhaps an international level of standardisation for VAL systems is still something that is unadvisable, and unfeasible.
1.1 Overview of New Zealand’s Volcanic Risk Setting
New Zealand has a range of volcanic risk settings that creates a challenge in effectively communicating scientific information to stakeholders, including the public. In terms of hazard, the volcanoes have large differences in the potential eruption styles and magnitudes of eruptions, reflected by variations in magma chemistry. The past frequency of eruptions and the date of the most recent eruption also vary considerably between them, which contributes towards a range in the likelihood element of the risk equation. The exposure and vulnerability of communities to unrest and eruptions also differs, with some volcanoes (such as Ruapehu, Ngauruhoe, and Tongariro) situated in a largely unpopulated National Park; and others are islands in the Pacific Ocean with few permanent residents (such as Raoul Island in the Kermadecs). Other volcanoes, such as Auckland Volcanic Field, Taupo Volcanic Centre, Okataina Volcanic Centre and Rotorua Caldera volcano, are in close proximity to cities. A few of the volcanoes receive tens of thousands of visitors each year, and are used commercially by tourist operators (including Whakaari/White Island). Others, such as Taranaki volcano, are surrounded by fertile agricultural land and are near important national infrastructure. Each of these elements of risk (hazard characteristics, likelihood, exposure and vulnerability) influence the type of communication and information required, as the local context needs to be considered.
There are eight areas of known caldera collapse in the central TVZ (Fig. 1), which itself can be considered to be a caldera system similar to Yellowstone in the USA. Although calderas are usually formed in occasional very large eruptions, their magma system can also be the source of many smaller eruptions. The calderas in the TVZ have erupted almost exclusively rhyolitic material in at least 25 caldera-forming eruptions in the last 1.6 million years (Wilson et al. 1984, 2009). Only <0.1% of the volume of deposits in all of the TVZ are from basaltic eruptions (Wilson et al. 1995). The caldera volcanoes have a large range in past eruption magnitudes. For example, the TVZ’s most-recent caldera collapse took place at Taupo Volcanic Centre (TVC) in 232 ± 5 AD, erupting 35 km3 of magma (Wilson 1993; Davy and Caldwell 1998; Self 2006; Hogg et al. 2012). This devastated a significant portion of the central North Island in widespread pyroclastic density currents (Wilson and Walker 1985). However, 26 of the 29 eruptions at TVC in the past 26,000 years (since the last supervolcano eruption) have been much smaller than the most recent eruption (Wilson et al. 2009). Therefore, it is unknown whether future eruptions at TVC will be relatively small, as has been the case most frequently, or devastatingly large, as was the case with the most recent eruption. An additional challenge is managing caldera unrest, which can cause social and economic impacts, without a resulting eruption (Potter et al. 2012, 2015).
The north-eastern extremity of the TVZ contains White Island (Whakaari), a privately owned andesitic stratovolcano located 50 km from the Bay of Plenty coastline. It is currently New Zealand’s most frequently active volcano, and a popular tourist destination with approximately 25,000 tourists and tourist operators visiting the island per year. Frequent eruptive sequences have been documented since written records began in 1826 (Nairn et al. 1991), with the most recent eruptions occurring in 2016. New Zealand is also responsible for a number of other island volcanoes, including Mayor Island in the Bay of Plenty, and Raoul and Macauley Calderas in the Kermadec Island chain, 750–1000 km northeast of New Zealand. These islands have very few visitors or residents. About 30 submarine volcanoes are also known in the Kermadec area and some exhibit eruptive activity. Due to the lack of monitoring data, a VAL is not allocated to them.
Taranaki Volcano is a stratovolcano located in the west of the North Island, outside of the TVZ. It is thought to have last erupted in 1755 AD (Druce 1966), but it may have subsequently extruded lava, forming a dome after this date (Platz 2007). It is capable of fairly large eruptions, and has a history of sector collapse (e.g., Neall 2003). Taranaki Volcano is surrounded by productive agricultural land and is in a major hydrocarbon (gas and oil) production region. There is a regional population of just over 100,000 people, most of whom live in the city of New Plymouth.
The intraplate Puhipuhi-Whangarei Volcanic Field (PWVF), the Kaikohe-Bay of Islands Volcanic Field (KBOIVF) and Auckland Volcanic Field (AVF) are in northern New Zealand (Fig. 1). PWVF is thought to have been active as recently as 0.26 Ma, while dating of the KBOIVF indicates an eruption occurred at about 0.05 Ma (Smith et al. 1993), or perhaps as recently as in 200–500 AD (Kear and Thompson 1964). AVF has had many eruptions from at least 53 basaltic vents, most recently about 600 years ago (e.g., Needham et al. 2011). Auckland city hosts a third of New Zealand’s population with 1.4 million residents, and is sited directly on top of AVF.
Eruptions from most of New Zealand’s volcanoes are likely to impact infrastructure of national importance, including many State Highways and road networks, electricity lines and power stations, train lines, water supplies, and sewage facilities (Wilson et al. 2012). Additionally, industries important to the local, regional, and national economies may be threatened during future eruptions, including the tourism, agricultural, forestry, and hydrocarbon industries.
1.2 Communication of Volcano-Related Information in New Zealand
In New Zealand, GNS Science is the agency appointed by the Government to provide scientific advice to local, regional, and central government organisations for geological hazards, as stated in the Guide to the National Civil Defence Emergency Management (CDEM) Plan (MCDEM 2015a) and a Memorandum of Understanding with the Ministry of Civil Defence and Emergency Management (MCDEM)(GNS Science, The Ministry of Civil Defence and Emergency Management 2015). The MOU outlines the obligations of GNS Science for geohazard warnings, whereas the Guide to the CDEM Plan is to assist New Zealand agencies to achieve the objectives of the National CDEM Plan (MCDEM 2015b). New Zealand’s volcanoes are today monitored by GNS Science through the GeoNet project (Scott and Travers 2009), funded primarily by the New Zealand Earthquake Commission (EQC).
Volcano-related information is communicated to stakeholders, including the public, in a variety of formats before, during, and after volcanic crises. The primary tool used is the Volcano Alert Bulletin (VAB), supported by web page information on GeoNet News,3 blogs, news items and social media tools (Facebook, twitter). Volcano hazard and status information is also presented by scientists during meetings, conferences, workshops, and public lectures; websites; in scientific and non-scientific publications; and via the media. Smartphone app push alerts, emails, faxes, pager alerts, and text messages provide one-way information to registered end-users during crises or changes in volcanic activity. Volcanic ash impact posters (a product of the Volcanic Impact Study Group, commissioned by the Auckland Lifelines Group) provide accessible information for critical infrastructure stakeholders (Wilson et al. 2014). Social media and ‘ask an expert’ interactive online sessions allow questions to be asked by the public and answered by scientists in real-time. Informal conversations during meetings, workshops, or by telephone provide end-users with more specific information from volcanologists, with the opportunity for two-way communication. An example of this is during Volcanic Advisory Group meetings, which are attended by key stakeholders and volcanologists to discuss volcano- and response-related information (Doyle et al. 2011). Long-term hazard maps have been created for some of the more active volcanoes, based on geological evidence of past eruptions (Neall and Alloway 1996; Scott and Nairn 1998). Event-specific hazard maps are created during unrest depending on the situation, likely vent location, and the style and magnitude of the potential eruption, etc. Event-specific hazard maps were created prior to and after the Tongariro eruption in 2012 (Leonard et al. 2014).
New Zealand’s VAAC, based at the Meteorological Service of New Zealand Ltd. (MetService) office in Wellington, is designated by the International Airways Volcano Watch system to communicate ash information for a large section of the southwest Pacific, including New Zealand’s active volcanoes (Lechner 2012). MetService issues Volcanic Ash Advisories in a text and graphic form, and disseminates a Significant Meteorological Information (SIGMET) message, while Airways Corporation issue Notice to Airmen (NOTAM), which draws attention to volcanic ash hazards within the NZ VAAC area. These globally standardised messages are also issued when New Zealand’s VAL changes, prompting restrictions to local air space. After consultation with GNS Science for NZ volcanoes, Volcanic Ash Advisories are communicated by the VAAC to MCDEM, in addition to being provided to international aviation agencies and meteorological communities (MCDEM 2015a). Volcanic Ash Advisories from MetService forecast the distribution of volcanic ash in the atmosphere for the purpose of aviation safety, whereas GNS Science issues ashfall prediction maps as a VAB, relating to the distribution and thickness of tephra deposits at ground level. In addition to these systems, GNS Science issues Volcano Observatory Notices for Aviation (VONA) to the VAAC to report on ground-based volcanic activity whenever they change the Aviation Colour Code (ACC; Table 1). The ACC is used by the Civil Aviation Authority of New Zealand to alert the aviation industry to changes in the status of volcanoes within the designated coverage area (Lechner 2012).
1.3 New Zealand’s Past VAL Systems
In New Zealand, scientists at GNS Science determine the VAL as mandated in the Guide to the National CDEM Plan (MCDEM 2015a), with consideration of monitoring data and using their experience and knowledge. When decisions need to be made rapidly (e.g., if an eruption has taken place), the Volcano Duty Officer can make the VAL decision alone. GNS Science, through GeoNet, communicates this information to MCDEM using Volcanic Alert Bulletins. MCDEM forwards this information on to local authorities and CDEM Groups through the National Warning System. GNS Science also disseminates this information to other agencies, the public, and the media (Scott and Travers 2009).
New Zealand’s first VAL system (known as the ‘Scientific Alert Level’ or SAL table; Table 2) was introduced in 1994. It was designed by local volcanologists, and included descriptions for different levels of activity for several types of volcanoes, sometimes within a single level of the table. For example, some levels included descriptions for both unrest and eruptions. Later this was to cause confusion as people were not sure which description the assigned VAL referred to.
New Zealand’s VALS used between 1995 and 2014. Reproduced from the MCDEM (2006) Guide to the National CDEM Plan, prior to its 2014 revision
The division of the VAL system based on eruptive activity was deemed to be beneficial during the creation of this system because the outcome of unrest was perceived to be more uncertain for reawakening volcanoes than frequently active volcanoes due to no eruptions being witnessed (except for the 1886 eruption at Okataina). Similarly, calderas (which were predominantly in the reawakening volcanoes group) were seen as more likely to exhibit unrest without resulting in an eruption than stratovolcanoes. Many scientists have the perception that end-users, who are more familiar with stratovolcano eruptions, think unrest will predominantly result in an eruption (Potter 2014). Thus, by separating reawakening volcanoes from frequently active volcanoes, it is implied that the volcanoes behave differently, and that unrest at reawakening volcanoes may not result in an eruption. An additional level of heightened unrest was inserted into the reawakening system to help reinforce this meaning.
2 Reviewing New Zealand’s VAL Systems
2.1 Standardising Multiple Systems into One for All Volcanoes
Complicated a system that was intended to be a simple communication tool.
May cause confusion in the future if two volcanoes exhibiting different levels of surface activity were allocated the same VAL system.
May cause confusion because as reawakening volcanoes become more active they may switch sides to become frequently active (and vice versa). This was the case in 2006 when an eruption occurred at Raoul Island.
Type (such as volcanic fields vs. calderas vs. stratovolcanoes)
Potential size of eruption (however even the most explosive volcanoes predominantly have small eruption sizes)
Tectonic setting (intraplate vs. subduction zone)
Typical risk from an eruption (e.g., Auckland Volcanic Field vs. Raoul Island)
Geographical region (or existing Volcanic Advisory Group).
One VAL system for each volcano was also considered, with the perceived benefit of being locally appropriate. However, this would result in at least 15 systems in New Zealand, most of which require a response by the same group of stakeholders and scientists due to the relatively small population size and land area, and having only one volcano observatory (at GNS Science near the township of Taupo). It is more likely that having multiple systems in this situation will lead to confusion and mismanagement than in a larger country where separate groups of people are responding to the same, familiar volcano over time. Many participants specifically stated that they would not want the over-complication of having too many VAL systems.
The division of volcanoes into separate VAL systems should be considered very carefully. The need for the VAL system to be used as a simple communication tool very likely outweighs any benefits of multiple tailored and more detailed VAL system. For these reasons, the revised VAL system was designed to be used for all of New Zealand’s volcanoes, regardless of factors such as the type, setting, frequency of eruptions, or typical eruption style.
Scientists were most knowledgeable and “comfortable” in determining the severity of phenomena, as opposed to considering other elements of risk. This would lead to less uncertainty and shorter warning times.
The severity of phenomena was seen as the first step in communication, and as being more relevant for a wider range of stakeholders. Interpretation and forecasting information can subsequently be tailored to various audiences, environments, and situations in other communication products.
The phenomenon-based system helps me understand what is going on and the relative severity of the event. The hazard-based system sets out clearly what needs to be done as a consequence. In terms of my CDEM responsibilities, we need both—people get twitchy about instructions given without context and justification.
During the final feedback process, this phenomena foundation system accompanied by hazard information was found to be useful and acceptable for all of New Zealand’s volcanoes in their varied risk environments.
2.1.1 Other Considerations When Standardising the VAL System
Very careful consideration was given to all words in the VAL system (Fig. 3) by its developers (Potter 2014; Potter et al. 2014). Not only did it need to be effective during escalation, de-escalation and static levels of volcanic activity, it also needed to be appropriate for the wide range of volcano types and settings in New Zealand. For example, the term ‘vent’ was used in VAL 3 in the hazard column instead of ‘crater’ because some volcanoes have very large craters (e.g., Taupo), or an eruption may occur from a vent on a volcano flank. The use of ‘vent’, ‘near volcano’ and ‘beyond volcano’ is part of the introduction of a dimensionless nomenclature to the VAL system.
No eruption forecasting language was included in the VAL system (beyond ‘potential for eruption hazards’ in VAL 2), because the capabilities and experience of the volcanologists in forecasting at each of New Zealand’s volcanoes is unequal. The use of each phenomena-based alert level would be restricted by the associated description of the expected future activity, which at some of New Zealand’s volcanoes, will be very uncertain. For example, if statements such as ‘eruption expected within the next two weeks’ were included in VAL 2, volcanologists would not be able to communicate that a volcano was showing heightened levels of unrest unless they also thought that an eruption was expected within the next two weeks. Forecasting information specific to each volcano is instead included in supplementary information, particularly Volcanic Alert Bulletins (VABs).
Because the VAL system needs to be standardised for use at multiple volcanoes, the wording needed to be very simple. Therefore, terms such as ‘minor’, ‘moderate’ and ‘major’ volcanic eruption needed to be defined in order for scientists to use the system consistently between volcanoes, between each other when voting on the VAL, and over time. A GNS Science guideline document has been drafted for this purpose with examples of typical activity shown at each VAL by various volcanoes. This approach was taken rather than describing monitoring criteria thresholds (e.g., rate of earthquakes or rate of deformation), to ensure the system can be used for every volcano regardless of its setting, and to give the scientists more flexibility. A GNS Science YouTube video4 was developed to help communicate the typical levels of activity for each of the VAL systems to the public and stakeholders.
3 Lessons Learnt from the NZ Case Study in Relation to the Standardisation of VAL System
When considering whether to utilise a standardised warning approach, Potter et al. (2014) explored the purpose of the VAL system, the information needs of New Zealand’s stakeholders, and the capabilities of the volcano monitoring system. They paid particular attention to the benefits and challenges of combining warning systems for all of the volcanoes into one. This included determining the foundation of the VAL system, the words used in the table, whether forecasting language should be included, and how the system was going to be used consistently over time and at multiple volcanoes. As identified by the IDNDR Early Warning Programme Convenors (1997), locally appropriate communication methods should be established for the distribution of warnings. The social science research used for this investigation was a robust process that enabled the revision of the VAL system to be based on evidence, as advocated by Leonard and Potter (2015). The resulting VAL system has been used for all of New Zealand’s volcanoes since June 2014. It has worked satisfactorily to date. For example, volcanic unrest or eruptions with which the revised system has been successfully used have included: unrest at Ngauruhoe (VAL raised to 1 and later lowered); decrease in unrest at Te Maari (VAL lowered to 0); and small eruptions at White Island (VAL raised to 3 and lowered later). Volcanologists at GNS Science have found the simple descriptions in the revised VAL table beneficial for allowing flexible decision-making when determining the level of activity. Having just one system for all NZ volcanoes has also improved clarity. Regular evaluations of this warning tool will take place in the future, involving stakeholders, volcanologists, and the public. There is more monitoring data and interpretation relevant to end-users and decisions than the VAL itself and in New Zealand such information is included in the accompanying VAB. Based on the recent experiences with review and implementation of New Zealand’s VAL systems, we strongly recommend stakeholders consider exactly what parameters, impacts, uncertainties and lead-times are important to each decision that needs to be made (e.g., evacuation) and not simply tie responses to changes in the VAL.
The revised VAL system has been developed for the New Zealand context, including our volcanic settings and risk environments, the roles and responsibilities of our agencies, and our social and cultural environments including the centralised nature of our volcano monitoring and warning system. As such, it is unlikely that it is able to be directly copied for other countries. However, the process that we followed can be used, as summarised in the next section.
4 Recommendations for Reviewing or Developing a VAL System
Understand the context
It is vital to understand the physical, cultural, social, organisational and historical context of the VAL and related systems. Potter et al. (2014) found that using the qualitative methodology of ethnography allowed a deep understanding of the culture of the volcanologists to be built to address many of the following factors. However, we recognise that this is a time-consuming process that is not an option for many observatories looking to revise their VAL systems. If this is the case, then drawing on published material, attending volcano monitoring meetings, and holding discussions with those familiar with the various environments should be sufficient. We recommend understanding as much as possible about the:
Range of potential volcanic activity at every volcano that the VAL system may be used for, including frequency of eruptions, level of ongoing unrest or eruptions, potential magnitude of eruptions (and unrest phenomena), and severity of all possible hazards.
Volcano monitoring system to understand capabilities and factors such as timing, uncertainties and content of incoming data.
Level of exposure and vulnerability of elements at risk to volcanic hazards, including the built, social, economic and natural environments.
Roles and responsibilities, including legislative requirements, of scientific advisors from all institutions, and organisations with the role of planning, education, response and recovery from volcanic events (including governmental and civil defence agencies, infrastructure/lifelines, emergency services, health, agricultural/horticultural and business sectors). For example, understand which agencies have the responsibility to communicate directly to the public.
Influences on the VAL decision-making process. This includes understanding the cultures of people/groups determining the VAL system, and the receivers of the information including decision-makers and stakeholders, and the public. For example, influences on the VAL decision-making process may include experience, external pressure, peer pressure and other social psychology biases, internal voting guidelines, how individuals interpret the content and structure of the VAL system, and the desire to maintain credibility or conduct fieldwork (Potter 2014). Factors such as these contributed towards the design of the revised NZ VAL system. Additionally, understanding the way stakeholders read volcano-related information and use it in their decision-making contributed towards determining what information was included in the NZ VAL system, how it is communicated to them.
Previous VAL systems, and any other existing alerting systems for volcanic or other hazards used in the country or for the volcano in question. What were people’s experiences with those systems? What worked well or didn’t work well? Are there any other warning systems being used on or near the volcano, including the international ACC? Understanding VAL systems that have been implemented in other parts of the world is also useful. Being familiar with the challenges and benefits of standardisation as outlined in this chapter is relevant for this point.
What other communication avenues exist for related information from all agencies? For example, Volcanic Alert Bulletins, phone calls, meetings, websites, emails, social media. These provide the context of whether the VAL system will need to include all important information as a standalone system, or if it can be supported by other channels.
Understand the challenges and benefits of the existing VAL system
Produce a draft version of the revised VAL system and seek feedback
Release revised system in collaboration with stakeholders
Evaluate the revised VAL System
Conduct regular evaluations to ensure the revised (or new) VAL system is effective, and meeting the needs of stakeholders, the public, and volcanologists. Real events and exercises can be used.
5 Volcanic Crisis Communication
Warnings about natural hazard events are communicated in order to minimise losses (Newhall 2000). However, trust and communication networks must already be in place prior to a crisis for effective planning and response. This can be achieved by developing networks, ascertaining information needs and establishing methods of effective communication (Paton et al. 1998). VAL systems are just one aspect of an EWS, and by design are the simplest tool to communicate the status of the volcano (or level of response required, etc.). Due to this overarching purpose, standardising VAL systems can help ensure a consistent, simple, and understandable design. As we have outlined in this chapter however, there are issues with using a one-size-fits-all communication product. This was also identified by Thompson et al. (2015) in using probabilistic volcanic hazard maps. We found that taking into account the local context is vital, which supports the findings of numerous recent research in volcanic crisis communication (Haynes et al. 2007; Fearnley et al. 2012; Potter et al. 2014). Providing supporting information using other means helps to alleviate these issues.
Over the past two decades, social science has increasingly played a valuable role in mitigating volcanic risks by providing evidence-based links between communities, stakeholders and scientists (Barclay et al. 2008; Leonard and Potter 2015). We recommend that in the future these robust methodologies are embraced by volcano observatories, such as when revising communication strategies and products, to help effectively share information and reduce the risk to society.
https://volcanoes.usgs.gov/vhp/notifications.html accessed 11 May 2017.
www.data.jma.go.jp/svd/vois/data/tokyo/STOCK/kaisetsu/English/level.html accessed on 11 May 2017.
GeoNet News web page can be found at: http://info.geonet.org.nz/.
www.youtube.com/watch?v=WeZxW2xyam0&list=UUTL_U_K1eP4T885-JL3rVgw, accessed on 11 May 2017.
The authors would like to thank all research participants, supervisors and colleagues for their contribution to this research. The research was primarily funded by the Government of New Zealand through the Natural Hazards Research Platform, and through the Earthquake Commission.
- Barclay J, Haynes K, Mitchell T, Solana C, Teeuw R, Darnell A, Crosweller HS, Cole P, Pyle D, Lowe C, Fearnley C (2008) Framing volcanic risk communication within disaster risk reduction: finding ways for the social and physical sciences to work together. Geol Society Lond Spec Publ 305(1):163–177CrossRefGoogle Scholar
- Doyle EEH, Potter SH (2016) Methodology for the development of a probability translation table for GeoNet. GNS Science report 2015/67. GNS Science, Lower Hutt, New Zealand, p 18Google Scholar
- Doyle EE, Johnston DM, McClure J, Paton D (2011) The communication of uncertain scientific advice during natural hazard events. NZ J Psychol 40(4):39–50Google Scholar
- Fearnley CJ (2011) Standardising the USGS volcano alert level system: acting in the context of risk, uncertainty and complexity. Ph.D thesis, University College London, London, UKGoogle Scholar
- Gardner CA, Guffanti MC (2006) U.S. geological survey’s alert notification system for volcanic activity. U.S. Geological Survey Fact Sheet 2006–3139. U S Geol Surv Google Scholar
- GNS Science, The Ministry of Civil Defence and Emergency Management (2015) Memorandum of understanding between the Ministry of Civil Defence & Emergency Management (MCDEM) and Institute of Geological and Nuclear Sciences Limited (GNS Science) for the engagement of geoscience and Civil Defence Emergency Management. pp 18Google Scholar
- ICAO (2004) Handbook on the International Airways Volcano Watch (IAVW). Doc 9766-AN/968: International Civil Aviation Organization (ICAO)Google Scholar
- IDNDR early warning programme convenors (1997) Guiding principles for effective early warning. Convenors of the international expert groups on early warning. United nations international decade for natural disaster reduction, Geneva, SwitzerlandGoogle Scholar
- Lechner P (2012) Living with volcanic ash episodes in civil aviation: the New Zealand Volcanic Ash Advisory System (VAAS) and the International Airways Volcano Watch (IAVW) Civil Aviation Authority of New ZealandGoogle Scholar
- Leonard G, Potter S (2015) Developing effective communication tools for volcanic hazards in New Zealand, using social science. In: Loughlin SC, Sparks S, Brown SK, Jenkins SF, Vye-Brown C (eds) Global volcanic hazards and risk. Cambridge University Press, Cambridge, UK, pp 305–310CrossRefGoogle Scholar
- Leonard GS, Stewart C, Wilson TM, Procter JN, Scott BJ, Keys HJ, Jolly GE, Wardman JB, Cronin SJ, McBride SK (2014) Integrating multidisciplinary science, modelling and impact data into evolving, syn-event volcanic hazard mapping and communication: a case study from the 2012 Tongariro eruption crisis, New Zealand. J Volcanol Geoth Res 286:208–232. doi: 10.1016/j.jvolgeores.2014.08.018 CrossRefGoogle Scholar
- Lindsay J, Marzocchi W, Jolly G, Constantinescu R, Selva J, Sandri L (2010) Towards real-time eruption forecasting in the Auckland Volcanic Field: application of BET_EF during the New Zealand national disaster exercise ‘Ruaumoko’. Bull Volc 72(2):185–204. doi: 10.1007/s00445-009-0311-9 CrossRefGoogle Scholar
- Maskrey MA (1997) IDNDR Secretariat, Geneva, Oct 1997Google Scholar
- MCDEM (2015a) The guide to the National Civil Defence Emergency Management Plan 2015. Ministry of Civil Defence & Emergency Management, Wellington. Retrieved from http://www.civildefence.govt.nz/assets/guide-to-the-national-cdem-plan/Guide-to-the-National-CDEM-Plan-2015.pdf
- MCDEM (2015b) National Civil Defence Emergency Management plan order 2015. (2015/140) Ministry of Civil Defence and Emergency Management,New Zealand. Retrieved from http://www.legislation.govt.nz/regulation/public/2015/0140/latest/DLM6486453.html?src=qs%20
- Nairn IA (2002) Geology of the Okataina Volcanic Centre. Geological map 25, scale 1:50 000, 1 sheet + 156p. Institute of Geological & Nuclear Sciences Limited, Lower HuttGoogle Scholar
- Nairn IA, Houghton BF, Cole JW (1991) Volcanic hazards at White Island. Volcanic hazards information series, vol 3. Ministry of Civil DefenceGoogle Scholar
- Neall VE (2003) The volcanic history of Taranaki. Massey University, Palmerston North, New Zealand, Institute of Natural ResourcesGoogle Scholar
- Neall VE, Alloway BV (1996) Volcanic hazards at Egmont Volcano; volcanic hazard map of western Taranaki. Volcanic hazards information series, vol 12. Occasional Report. Massey University, New ZealandGoogle Scholar
- Newhall CG (2000) Volcano warnings. In: Sigurdsson H, Houghton BF, McNutt SR, Rymer H, Stix J (eds) Encyclopedia of Volcanoes. Academic Press, San Diego, CA, pp 1185–1197Google Scholar
- Platz T (2007) Aspects of dome-forming eruptions from andesitic volcanoes through the Maero Eruptive Period (1000 yrs B.P. to present): activity at Mt. Taranaki, New Zealand. Ph.D thesis, Massey University, Palmerston North, New ZealandGoogle Scholar
- Potter SH (2014) Communicating the status of volcanic activity in New Zealand, with specific application to caldera unrest. Ph.D thesis, Massey University, Wellington, New Zealand. Retrieved from http://mro.massey.ac.nz/handle/10179/5654
- Potter SH, Scott BJ, Jolly GE (2012) Caldera unrest management sourcebook. GNS Science Report 2012/12. GNS Science, Lower Hutt, New Zealand, p 73Google Scholar
- Potter SH, Jolly GE, Neall VE, Johnston DM, Scott BJ (2014) Communicating the status of volcanic activity: revising New Zealand’s volcanic alert level system. J Appl Volcanol 3(13)Google Scholar
- Scott BJ (1978) Volcano and geothermal observations 1977: observed activity at Ngauruhoe. New Zealand Volcanological Record (pp 44–45): NZ Geol Surv, DSIRGoogle Scholar
- Scott BJ, Nairn IA (1998) Volcanic hazards: Okataina volcanic centre. Scale 1:100,000: Bay of Plenty Regional Council. Resource planning publication/Bay of Plenty Regional Council, New Zealand 97/4Google Scholar
- UN ISDR (2003) Terminology: basic terms of disaster risk reduction retrieved 25/08/2009, from http://www.unisdr.org/eng/library/lib-terminology-eng%20home.htm
- United Nations (2006) Global survey of early warning systems. Final Version. 46 p. http://www.unisdr.org/2006/ppew/info-resources/ewc3/Global-Survey-of-Early-Warning-Systems.pdf (accessed 20 March 2010)
- Wilson CJN, Gravley DM, Leonard GS, Rowland JV (2009) Volcanism in the central Taupo Volcanic Zone, New Zealand: tempo, styles and controls. Studies in Volcanology: the legacy of george walker. Spec publ IAVCEI 2:225–247Google Scholar
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