Bulletin of Volcanology

, Volume 74, Issue 7, pp 1713–1727 | Cite as

Regional ash fall hazard II: Asia-Pacific modelling results and implications

  • Susanna Jenkins
  • John McAneney
  • Christina Magill
  • Russell Blong
Research Article

Abstract

In a companion paper (this volume), the authors propose a methodology for assessing ash fall hazard on a regional scale. In this study, the methodology is applied to the Asia-Pacific region, determining the hazard from 190 volcanoes to over one million square kilometre of urban area. Ash fall hazard is quantified for each square kilometre grid cell of urban area in terms of the annual exceedance probability (AEP), and its inverse, the average recurrence interval (ARI), for ash falls exceeding 1, 10 and 100 mm. A surrogate risk variable, the Population-Weighted Hazard Score: the product of AEP and population density, approximates the relative risk for each grid cell. Within the Asia-Pacific region, urban areas in Indonesia are found to have the highest levels of hazard and risk, while Australia has the lowest. A clear demarcation emerges between the hazard in countries close to and farther from major subduction plate boundaries, with the latter having ARIs at least 2 orders of magnitude longer for the same thickness thresholds. Countries with no volcanoes, such as North Korea and Malaysia, also face ash falls from volcanoes in neighbouring countries. Ash falls exceeding 1 mm are expected to affect more than one million people living in urban areas within the study region; in Indonesia, Japan and the Philippines, this situation could occur with ARIs less than 40 years.

Keywords

Volcanic hazard Hazard assessment Probabilistic modelling Ash dispersion Regional hazard assessment Modelling implications 

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Susanna Jenkins
    • 1
    • 2
  • John McAneney
    • 1
  • Christina Magill
    • 1
  • Russell Blong
    • 1
    • 3
  1. 1.Risk FrontiersMacquarie UniversitySydneyAustralia
  2. 2.Now at Department of Earth Sciences, Wills Memorial BuildingUniversity of BristolBristolUK
  3. 3.AonBenfield AustraliaSydneyAustralia

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