Living with Earthquakes along the Silk Road
Earthquakes are among the most horrible events of nature due to unexpected occurrence, for which no spiritual means are available for protection. The only way of preserving life and property is to prepare for the inevitable: applying earthquake-resistant construction methods. Zones of damaging earthquakes along the Silk Road are reviewed for seismic hazard and to understand the ways local civilizations coped with it during the past two thousand years. China and its wide sphere of cultural influence certainly had earthquake-resistant architectural practice, as the high number of ancient buildings, especially high pagodas, prove. A brief review of anti-seismic design and construction methods (applied both for wooden and masonry buildings) is given, in the context of earthquake-prone zones of Northern China. Muslim architects in Western China and Central Asia used brick and mortar to construct earthquake-resistant structural systems. Ancient Greek architects in Anatolia and the Aegean applied steel clamps embedded in lead casing to hold together columns and masonry walls during frequent earthquakes. Romans invented concrete and built all sizes of buildings as a single, non-flexible unit. Masonry, surrounding and decorating the concrete core of the wall, did not bear load. Concrete resisted minor shaking, yielding only to forces higher than fracture limits. Roman building traditions survived the Dark Ages, and 12th century Crusader castles erected in earthquake-prone Syria survive until today in reasonably good condition. Usage of earthquake-resistant technology depends on the perception of earthquake risks and on available financial resources. Earthquake-resistant construction practice is significantly more expensive than regular construction. Frequent earthquakes maintain safe construction practices, like the timber-laced masonry tradition in the Eastern Mediterranean throughout 500 years of political and technological development.
KeywordsSeismicity Anti-seismic Construction method Masonry Timber Adobe China Central Asia Turkey Syria Greece Italy
While seismicity of any area on earth can nowadays be easily measured by instrumental seismology, the quantity, quality, and distribution of the seismograph stations has been more or less sufficient for the purpose during the last 50 years only. Recurrence period of damaging earthquakes is often longer than this, even longer than individual and social memory (Force 2008). To gain information about seismic events one needs to study historical sources (Guidoboni 1993; Guidoboni and Ebel 2009), archaeological evidence (Stiros and Jones 1996), and geological evidence (McCalpin 1996).
Archaeoseismology, the archaeological study of earthquakes is extremely useful for scientists assessing seismic hazards (Sintubin 2013). It is a treasure trove of information about ancient societies. Perception of earthquakes, the risk a society can and will tolerate, the longevity and means of their social memory (Kázmér et al. 2010), expertise of builders to construct buildings which can resist ground shaking, and technology transfer associated with these activities are relevant questions for historical and social sciences.
Another worthwhile direction of research is the role of external forcing factors on human evolution. Recent studies almost invariably focused on climate change and climate-influenced change of vegetation (Maslin and Christensen 2010), while mostly neglecting the effects of seismic and volcanic catastrophes (King and Bailey 2010). An interesting idea of Force and McFadgen (2010) states that there are thirteen Neolithic cultures which later developed into major civilizations (Roman, Etruscan, Corinthian, Mycenaen, Minoan, Tyre, Jerusalem, Niniveh, Ur-Uruk, Mesopotamian, Persian, Mohenjodaro, Aryan India, Memphis in Egypt, and Chinese). One can readily add the Aztec, Maya and Inca cultures along the seismic western margin of the Americas. Putting these on a map of earthquakes it is striking to observe that all of them evolved in close proximity to faults and mountain ranges of high earthquake activity (Jackson 2006). In this study another set of sites is added, arranged along tectonically active zones along the northern margin of the Eurasian mountain range: the belt of settlements and cultures collectively called the Silk Road (Lieu and Mikkelsen 2017).
There is long but somewhat meagre tradition of studying seismic hazard, risk, and resilience of societies along the Silk Road. Earthquakes are parts of nature and life, and people have developed a connection with land throughout millennia (e.g. in Iran: Ibrion et al. 2014; however, the 2003 Bam earthquake arrived to a community not believing it can happen: Parsizadeh et al. 2015). Knowledge of seismicity and the methods used by local people to resist and survive destruction inflicted by natural calamities in general (Janku 2010) and by earthquakes in particular (Jusseret 2014; Rideaud and Helly 2017) are valuable contributions to the understanding how human society works.
Environmental history of the Silk Road has been studied intensively (see papers in the present volume), but earthquake hazard and risk, even when known to exist (Xu et al. 2010), were not systematically considered (Li et al. 2015). An exception is the activity of the team of Korjenkov (later spelled as Korzhenkov) in Central Asia, mostly Kyrgyzstan (Korjenkov et al. 2003, 2006a, b, 2009; Korzhenkov et al. 2016).
Forlin and Gerrard (2017) reviewed the ways how communities affected by earthquakes behave after the event: the spiritual, constructional, and financial steps taken to restore the community and its property. Here we discuss the preventive measures taken by populations living along the Silk Road, irrespective whether these have been applied consciously or unconsciously, based on tradition only.
7.2 Seismicity Along the Silk Road
There is a great earthquake and mountain belt that runs from China to Italy. Throughout this region the topography is largely created by fault movement in earthquakes. These faults move as a result of the ongoing collision between the Eurasian plate to the north and the African, Arabian and Indian plates to the south. Settlements are concentrated along the range fronts (Jackson 2006).
The Silk Road, a classical artery of travel, trade and conquest, ran along the southern, mountainous margin Eurasia. It started in the ancient Chinese capital of Xi’an in the east, allowing the transfer of people, goods and ideas into the Middle East, especially to Persia, Baghdad and Anatolia. Connections reached as far as the Greek and Roman world in the Mediterranean. Probably it is not by chance that this caravan route followed the occurrence of springs, rivers, and settlements arranged along the foot of tectonically active mountains. Although certainly being a route of convenience, people and pack animals needed water, food and rest during their travel, and markets to exchange goods. These were provided by mountain-foot springs, by agriculture developed on alluvial fans, and the settlements inhabited by farmers, craftsmen and traders (Jackson 2006).
While most of the Silk Road runs in the temperate and subtropical desert zone, there is ample mountain topography to create orographic rain, and to provide year-round streamflow and perennial springs.
So the mountains are both beneficial to their inhabitants: providing rainfall, storing water, and at the same time fatally dangerous: producing earthquakes and other natural calamities. It is a well-calculated decision of societies to live there or abandon these places. It seems that humans prefer to take risks, and—considering the benefits—do not mind to live in areas regularly destroyed by catastrophic earthquakes. In this paper methods are examined on how people counter seismic destruction of their buildings, and the evidence on people’s understanding and misunderstanding of these life-threatening natural processes.
7.3 Archeoseismology and Other Seismologies
The way we recognize and understand earthquakes is in tremendous change nowadays. There are digital instruments worldwide to receive seismic signals globally, and internet-connected computers automatically calculate the place, depth, and magnitude of earthquakes. This has been going on for not more than twenty years. Before that individual seismometers have been recording earthquakes for up to a hundred years. This is enough to understand the major seismic patterns of the earth, but not enough to be prepared for major earthquakes, especially in areas where these occur rarely.
The bigger an earthquake, the more rarely it occurs again at the same place. This recurrence period is often longer than the period covered by data of seismographs. To understand seismicity of the pre-instrumental period one must refer to historical documents: it is a scientific field called historical seismology (Guidoboni and Ebel 2009). A few centuries, rarely millennia can be more or less covered by these data. Where historical records are missing, there might be evidence preserved in ancient monuments. The way these were damaged by earthquakes is studied by archaeoseismology (Stiros and Jones 1996). Earthquakes recurring beyond these millennial intervals are studied by paleoseismology, theoretically into millions of years of Earth history (McCalpin 1996).
Seismicity of the past has been studied in detail on both ends of the Silk Road. Japanese historical earthquake catalogues have been reviewed by Ishibashi (2004). In China there are multiple catalogues available (Academia Sinica 1956; Li 1960; for a modern treatment of philological depth see Walter 2016). There are two recent catalogues in the Mediterranean region (Ambraseys 2009; Guidoboni and Comastri 2005). Between them there is the area covered by the catalogue of Ambraseys and Melville (1982) on Persian earthquakes, and historical catalogue of Kondorskaya and Shebalin (1982) of earthquakes in the former Soviet Union. The latter covers much of the Central Asian sector of the Silk Road.
7.4 Construction Materials in Earthquake-Resistant Techniques
Materials used in permanent and semi-permanent construction varies according to purpose, availability, financial resources, cultural and climatic influences. Adobe, brick, wood, stone, concrete, and metal reinforcements are discussed below. Our knowledge of past construction practices are limited by preservation: adobe is the worst, wood is second, while monumental stone masonry and Roman concrete has the best potential to be preserved for future generations and for the inquisitive eyes of the researcher. Finances determine permanence of buildings, therefore rural construction has the least chance to survive, urban dwellings stand in the middle, and secular and religious monumental constructions are the best to resist destruction of passing millennia.
In respect of anti-seismic construction practices monumental buildings provide the best examples. These are built from the best material, even if it had to be transported from faraway locations at high expenses. The best architects and builders were hired so that the building would last for eternity. Usually high cultures were able to build these at the height of their power.
These cultures—flourishing at opposite ends of the Eurasian continent—used a variety of construction techniques, hampering comparison of the earthquake-resistant construction practices. China did not use the marble columns of Greece and Rome, neither masonry arches invented by the Romans. Instead, a combination of wood and brick masonry was often used in ways not found in the Mediterranean. Italy extensively used metal anchors to hold together buildings already damaged by earthquakes (Forlin and Gerrard 2017); this method was not seen towards the east.
7.4.2 Rammed Earth, Adobe
7.4.4 Wood-Reinforced Masonry
In general, all timber-framework houses are based on the same structural principle: the wooden structural system bears mainly the horizontal loads while either the masonry or timber columns support the gravity loads (Dutu et al. 2012). The variety of framework geometries applied are practically unlimited. However, the simplest buildings, like a vernacular house in the city of Elbasan in Albania (Fig. 7.10), having only horizontal boards embedded in masonry (hatil construction) increases the resistance of the buildings to horizontal loads, i.e. lateral shaking by seismic waves. Niyazov (2012) provided a concise report on how both adobe and masonry vernacular buildings are routinely reinforced with wooden beams im Tajikistan. The European (Mediterranean) historical practice was reviewed by Dutu et al. (2012).
7.4.5 Brick Bands
7.4.6 Metal Clamps, Bolts, Anchors and Chains
7.4.7 Interlocking Masonry
7.4.8 Roman Concrete
Most walls of al-Marqab citadel in coastal Syria, both Crusader and Muslim, are one of two types: either stone masonry or opus caementitium, i.e., “Roman concrete” (Lamprecht 2001) or “ancient concrete” (Ferretti and Bažant 2006). Stone masonry is characterized by dressed stones, hewn rectangular and of standard size, with or without mortar, always without metal anchors. Arches, domes, thick walls routinely have been constructed this way.
7.5.1 Social Memory of Calamities
As we learned from Jackson (2006) “it is the fault that provides the water, but the fault may kill you when it moves”. The relatively minor agricultural and trading settlements developed along the Silk Road in the past millennia are vulnerable to earthquake destruction. However, even if human fatalities can reach sizeable proportion of the inhabitants (Jackson 2006), these often come infrequently, beyond the length of individual and social memory. There is very little research on the longevity of social memory; we can assess with confidence that it probably lasts at least for three generations (from grandparents to grandchildren). Longer memory can be assured if and where religious practice or taboo is associated. Repeat times of earthquakes on individual faults are likely to be measured in hundreds or thousands of years and they are most unlikely to recur on a timescale relevant for human memory (Jackson 2006).
One is ready to consider a natural calamity (in our case the earthquake) as root cause of devastation and loss. As it has been recognized in social sciences some time ago, a catastrophe is a trigger mechanism only, which releases a disaster that was waiting to occur, due to deep-rooted social causes (Degg and Homan 2005). A similarly high-magnitude earthquake which causes neither loss of life, nor material damage in Mongolia (the Gobi-Altay Mw8.1 earthquake in 1957), can cause fatalities well into the hundreds of thousands in China (the Tangshan M7.5 earthquake in 1977), not only because population density is so much higher in the latter, but because of inappropriate construction methods.
7.5.2 Anti-seismic Construction Practices
Timber structures and timber-reinforced masonry and adobe structures have been in use all along the Silk Road from China to the Mediterranean for millennia (Semplici and Tampone no date). Whether their use is the result of parallel innovation or spread of good practices either east or west, is a matter of research in progress. Detailed study on fitting of beams and columns, for example, might help to recognize independent or dependent development of life-saving construction practices.
Monumental buildings are the best for the study of anti-seismic construction methods. These, especially the religious buildings were created for eternity. The best material was used, even if transported from faraway location. The best workmanship was applied. From site selection to construction and to subsequent maintenance probably the best conditions existed.
Some construction methods are characteristic for certain civilizations only. E.g. marble and sandstone columns are typical for Greek and Roman monumental architecture. These columns, especially if made of multiple drums, are kind of seismoscopes, i.e. simple earthquake-sensing devices, being easily deformed by earthquakes. As China did not use these stone columns, an important archaeoseismological evidence is inherently missing there.
7.5.3 Earthquake-Resistant Construction Without Apparent Need
While Palmyra (Tadmor, Syria) is not particularly active seismically (Sbeinati et al. 2005), the use of lead-enclosed metal dowels and clamps in the 2000 years old Nabatean Baal temple shows high knowledge of anti-seismic construction methods. We are aware of three Greeks, one of them an architect, who worked on the construction (Stoneman 1994). This construction method probably was developed in Greece, which is the seismically most active part of the Alpine-Himalayan mountain belt (Tsapanos 2008). It is possible that architects of the era carried their experiences from the homeland to faraway territories, transferring essential knowledge of earthquake resistant construction, and routinely applied it to the monumental architecture they created.
7.5.4 Traditional Good Practices and Modern Construction
One of the construction materials discussed invites an important remark. Wood-reinforced masonry is at least as good as modern steel-frame and reinforced concrete (RC) buildings, and the chance of survival for their inhabitants is often higher, as engineering studies of modern earthquakes show. The reason is not necessarily that RC is inferior; it can be designed and produced to be earthquake-resistant. The problem is the uneducated, unregulated and uncontrolled construction industry in the rapidly growing developing countries overlapping major seismic zones worldwide. In this situation traditional construction practices of vernacular architecture are better, more reliable than the RC construction in need of sorely lacking construction skills (Langenbach 2015).
The importance of engineers’ understanding and appreciation of vernacular construction practices cannot be overestimated (Dixit et al. 2004). Portugal, since the tragic 1755 Lisbon earthquake, has been in the forefront of developing earthquake-resistant construction practices, contributing to the awareness of the local seismic culture (Correia et al. 2014). There was even an European centre for studying traditional anti-seismic practices based on archaeological approach (Helly 1995). Application of good practices learned from local seismic cultures would significantly reduce vulnerabilty of communities living in earthquake-prone areas (Karababa and Guthrie 2007).
Although experts agree that wooden framework buildings resist earthquakes very well, the presence of ancient timber-framework buildings does not indicate an earthquake-prone area. Where wood is available, and local tradition and builders are at hand, this construction method is widely applied (see the German and Austrian Fachwerk construction) (Bostenaru Dan 2014).
Systematic use or disuse of known earthquake-resistant techniques in any society depends on the perception of earthquake risk and on available financial resources. Earthquake-resistant construction practice is significantly more expensive than regular construction. Perception is influenced mostly by short individual and longer social memory. If earthquake recurrence time is longer than the preservation of social memory, if damaging quakes fade into the past, societies commit the same construction mistakes again and again. Longevity of the memory is possibly about one to three generations’ lifetime, i.e. less than 100 years. Events occurring less frequently can be readily forgotten, and the risk of recurrence considered as negligible, not worth the costs of safe construction practices. Frequent earthquakes maintain safe construction practices, like the timber-laced masonry tradition in the Eastern Mediterranean throughout 500 years of political and technological development.
Archaeoseismology, the archaeological study of past earthquakes, is a treasure trove of information about the behaviour of ancient societies. Earthquakes are part of nature and life along the overland Silk Road between China and the Mediterranean; peoples developed various methods to cope with the risk. Making buildings able to resist the shaking of the ground and knowing ways of quick reconstruction after destruction depend on available material and knowledge of good construction practices.
Materials used in permanent and semi-permanent construction vary according to purpose, availability, financial resources, cultural and climatic influences. Mostly adobe, brick, wood, stone, ancient concrete, and metal reinforcements were applied for earthquake-resistant construction. Rammed earth houses can be built and restored quickly and cheaply. Wood is the ultimate earthquake-resistant construction material: it can resist seismic shaking and allows quick reconstruction in case of damage. Wood-reinforced masonry provides flexible support to masonry buildings. Brick layers laid within stone masonry walls provide additional flexibility during shaking. Metal dowels, clamps, bolts, anchors and chains provide minor but essential support of structures in case of moderate earthquakes. Interlocking masonry prevents vertical displacement of arch stones. Roman concrete, rubble cemented by lime and additives is another excellent construction material for anti-seismic purposes. Our knowledge of past construction practices are limited by preservation: adobe is the worst material for long-term survival, wood is second, while monumental stone masonry and Roman concrete has the best potential to be preserved for millennia.
Architects of the era carried their experience from the homeland to faraway territories, transferring essential knowledge of earthquake resistant construction. They routinely applied anti-seismic techniques even far away from seismically active faults. Application of good practices learned from local seismic cultures would significantly reduce vulnerability of communities living in earthquake-prone areas. Knowledge of seismicity and the local methods used to resist and survive destruction are valuable contributions to understand how society works.
The author is indebted to the following colleagues for help and advice during field work: Zeynep Ahunbay (Istanbul, Turkey), Keyan Fang (Fuzhou, China), Andrey Korzhenkov (Moscow, Russia), Balázs Major (Piliscsaba, Hungary), Ernest Moro (Padova, Italy), Oki Sugimoto (Tsukuba, Japan). Financial help of a CEEPUS scholarship to Tirana (Albania) and of the Syro-Hungarian Archaeological Mission (SHAM) is sincerely acknowledged. Two anonymous reviewers and the editors are gratefully acknowledged for their detailed comments, which significantly improved the manuscript. This is SHAM publication nr. 72.
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