THE SURFACE RUPTURES AND THE MACROSCOPICAL EPICENTER OF YUSHU <i>M</i><sub>S</sub>7.1 EARTHQUAKE

MA Yin-sheng; ZHANG Yong-shuang; HU Dao-gong; YANG Nong; LONG Chang-xing; HOU Cun-tang; YAN Peng; WU Zhong-hai; YANG Zhen-yu; LEI Wen-zhi; TAN Cheng-xuan

2010 Vol. 16, No. 2

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MA Yin-sheng, ZHANG Yong-shuang, HU Dao-gong, YANG Nong, LONG Chang-xing, HOU Cun-tang, YAN Peng, WU Zhong-hai, YANG Zhen-yu, LEI Wen-zhi, TAN Cheng-xuan. THE SURFACE RUPTURES AND THE MACROSCOPICAL EPICENTER OF YUSHU MS7.1 EARTHQUAKE[J]. Journal of Geomechanics, 2010, 16(2): 115-128.

Citation:

MA Yin-sheng, ZHANG Yong-shuang, HU Dao-gong, YANG Nong, LONG Chang-xing, HOU Cun-tang, YAN Peng, WU Zhong-hai, YANG Zhen-yu, LEI Wen-zhi, TAN Cheng-xuan. THE SURFACE RUPTURES AND THE MACROSCOPICAL EPICENTER OF YUSHU M_S7.1 EARTHQUAKE[J]. Journal of Geomechanics, 2010, 16(2): 115-128.

THE SURFACE RUPTURES AND THE MACROSCOPICAL EPICENTER OF YUSHU M_S7.1 EARTHQUAKE

1.
Key Laboratory of Neotectonic Movement & Geohazard, Ministry of Land and Resources, Beijing 100081, China
2.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 10081, China

Received Date: 14 May 2010

Publish Date: 25 June 2010

Abstract

Abstract

At 7:49:40.7 on April 14, 2010, a M_S 7.1 earthquake happened in Yushu County of Qinghai Province. In the field investigation two surface rupture zones were observed from west to east, Longbaotan surface rupture zone and Yushu surface rupture zone. They display NW trending and are respectively developed along hang wall of the Longbaotan active fault and Yushu active fault at an interval of 22km. The Longbaotan surface rupture zone, trending along 290° with a length of 21.5km, was sinistral strike-slip movement with a sinistral strike-slip displacement of about 1m. The Yushu surface rupture zone, trending 310° with a length of 23km, can be further divided into three sections. It shows sinistral strike-slip movement in western and middle segment, sinistral strike-slip and thrust in eastern segment. The maximum sinistral strike-slip displacement (2.4m) of the rupture zones appears near the Guoyangyansongduo. According to the displacement of the earthquake surface rupture and building destruction, the earthquake macroscopical epicenter can be considered in the Guoyangyansongduo near the macroscopical epicenter coordinates: at 33°03′11″N and 96°51′26″E.
- Yushu earthquake /
- active fault /
- seismic fault

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References

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