Field Investigation on the Near-Fault Damaging Effects of the 2008 Yutian MS7.1 Earthquake in Xinjiang , China
详细信息
- 责任者：Shen Jun (Institute of Disaster Prevention Science and Technology ; Beijing 101601 ; China) ; Song Heping
- 刊名：Earth Science Frontiers
- 出版年：2013
- 卷期：20(6)
- 关键词：大震 ; great earthquakes ; 地震构造 ; seismotectonics ; 震灾 ; seismic hazard ; 新疆 ; Xinjiang
- 页码：p.85-93
- 图表：8 illus., 27 refs.
- 分类号：1800
- issnNo：ISSN1005-2321
- isbnNo：CN11-3370/P
摘要
The near-fault damaging effects of 2008Yutian MS7.1earthquake in Xinjiang,China were investigated in May of 2011.This quake occurred at the junction of West Kunlun,East Kunlun and Altun Tag Mountains in the north margin of Tibetan Plateau.The characteristics of near fault damaging effects of this quake are introduced in this paper.After the earthquake,a 31km long surface rupture appeared along the eastern slope of a N-S trending valley with the elevation of 4900-5600m,developed in the western end of the Altun Tag fault.The general trending of the rupture is in N-S,but locally it extends following the conjugate breaks of NNE-NNW and varies greatly in trending.Due to the topography and slumping,the maximun height of the fault scarp on the steep slope is up to 20m.The largest vertical offset of the rupture is about 2m,and the maximum horizontal extension is about 1.8m.Besides,there are locally about 1msinistral displacements.A large landslide with area over 10hm2,as well as a large number of moderate and small landslides and collapses were developed during the quake in loose debris,including moraine,diluvial,and eluvial deposits,which can be seen along the surface ruptures on the mountainside.No large scale bedrock collapse or landslide was found,even on the steep slopes along the rupture.The peak acceleration of strong ground motion,inferred from the evidence of rolled or turned over of large boulders on the level ground,is up to 1 g.Based on the collapse of slopes and the development of large boulders,the peak acceleration values of the strong ground motion at various distance from the fault can be calculated.The distribution of the surface cracks is rather wide,and about 1km from the the fault,the surface cracks more than 100mlong still can be found.These cracks are probably the integrated results of earthquake tremor,valley slope deformation and quake-induced sliding of the branch faults.The maximum intensity of extreme seismic zone of this quake is estimated to beⅩdegree in Chinese Seismic Intensity Scale.The isoseismic lines of Ⅸ,Ⅷ,Ⅶ degrees were inferred from comprehensive observed data or phenomena.The long axis of the intensity district is trending to NNE-SSW,which is consistent with the distribution of aftershocks.The near-fault damage effects involved strong ground motion,fault ruptures,fissures,landslides,collapses,and rock falls.They were controlled by the magnitude and slip sense of the quake,and the site condition of the epicenter.
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