Seven years on: what have we learned from the geohazards associated with the Wenchuan earthquake and future challenges
Strong earthquakes are capable of triggering several thousands of landslides,which may incur substantial damage to people and infrastructure,and often surpass losses caused by seismic shaking alone.Seven years ago on May 12,2008,a devastating earthquake (Mw 7.9) hit the Sichuan province in China,was the countrys largest seismic event in more than 50 years.Apart from the immediate devastation through shaking,the earthquake triggered an unprecedented number of landslides over a broad area,causing about 20,000 deaths (Yin et al,2009),about one-third of the official estimate of total fatalities(69,197,http://www.gov.cn).A huge amount of deposits from these coseismic landslides (5-15 km3 as estimated by Parker et al.,2011) greatly increased the frequency and magnitude of post-earthquake debris flows induced by subsequent rainfall events (i.e.,Tang et al.,2012).Some of these landslides and debris flows in the vicinity of rivers blocked rivers,forming landslide dams and barrier lakes,which had posed serious threats to people and property due to upstream inundation and downstream dam-breach flooding(Cui et al.,2009; Fan et al.,2012a).For example,the Tangjiashan landslide dam had impounded the largest lake with an estimated maximum volume of 3 × 108 m3,threatening more than 2.5 million people downstream (i.e.,Liu et al.2009; Fan et al.,2012b).
Xuanmei Fan Qiang Xu Runqiu Huang Cees J.van Westen Chuan Tang
The State Key Laboratory of Geohazards Prevention and Geoenvironment Protection(Chengdu University o Faculty of Geo-Information Science and Earth Observation(ITC), University of Twente, 7500 AE,Ensched
国际会议
成都
英文
29-30
2015-05-09（万方平台首次上网日期，不代表论文的发表时间）