Near-field postseismic deformation along the rupture of 2008 Wenchuan earthquake and its implications

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• 作者：HongLin He (1)
  ZhanYu Wei (1)
  Feng Shi (1)
  HaoYue Sun (1)
  
• 关键词：Wenchuan earthquake ; near ; field postseismic deformation ; fault scarp and flexure scarp ; energy residue and deficit
• 刊名：Chinese Science Bulletin
• 出版年：2010
• 出版时间：August 2010
• 年：2010
• 卷：55
• 期：23
• 页码：2535-2541
• 全文大小：1136KB
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• 作者单位：HongLin He (1)
  ZhanYu Wei (1)
  Feng Shi (1)
  HaoYue Sun (1)
  
  1. National Center for Active Fault Studies, Institute of Geology, China Earthquake Administration, Beijing, 100029, China
  
• ISSN：1861-9541

文摘

At first time, we observed the postseismic deformation, which actually is a kind of creep after slip, along the intra-plate active fault associated with the Wenchuan earthquake. To understand the near-field postseismic deformation following 2008 Wenchuan earthquake in Sichuan Province of China, we compared the fault scarp or flexure scarp profiles measured in different campaigns. Our result shows that among total 19 observation sites, on 13 sites (68% of 19) fault scarps fall back with an average about 9.7% decrease; on 5 sites (26% of 19) fault scarps present no change; and on one site (6% of 19) fault scarp continues to uplift with 12.8% increase. The variety of fault scarp we observed results mainly from near-field postseismic deformation, after slip occurred in shallow. Based on our observations, the following are demonstrated: except for the southwestern end near Yingxiu Town where coseismic slip deficit and some elastic energy residue exist there, fall back (68%) or non-changing (26%) of fault scarp shows energy balance or energy deficit due to overthrust, implying that the likelihood of occurrence of strong aftershocks of ?M7 becomes very small in these energy-released areas. Moreover, we suggest that a minimum of 10% error due to near-field postseismic deformation should be considered when evaluating the magnitude of historic and paleoearthquake or slip rate based on the fault scarp displacement, even though the error caused by erosion has been accounted already.