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Wang Ji1),Chen Lichun2),Tian Qinjian1),Li Zhimin3),Sun Xinzhe2),Zhang Xiaoqing3)
Author NameAffiliation
Wang Ji1) 1) China Earthquake Disaster Prevention Center, Beijing 100029, China 
Chen Lichun2) 2)Institute of Geology, China Earthquake Administration, Beijing 100029, China 
Tian Qinjian1) 1) China Earthquake Disaster Prevention Center, Beijing 100031, China 
Li Zhimin3) 3)Earthquake Administration of Qinghai Province, Xining 810001,China 
Sun Xinzhe2) 2)Institute of Geology, China Earthquake Administration, Beijing 100029, China 
Zhang Xiaoqing3) 3)Earthquake Administration of Qinghai Province, Xining 810003,China 
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The Emergency Scientific Investigation on the Surface Rupture Zone of the M_S 7.1 Yushu Earthquake
Wang Ji1),Chen Lichun2),Tian Qinjian1),Li Zhimin3),Sun Xinzhe2),Zhang Xiaoqing3)
Abstract:
The coseismic surface rupture zone of the seismogenic fault of the MS7.1 Yushu earthquake includes three left-stepping main ruptures, striking 300°~320°, in general. An approximately 2km-long en echelon tension fissure zone was found at Longbao town. The main rupture in the northern part is about 16km long, about 9km long in the middle part, and about 7km long in the southern part, with a total length of 34km. Each of the main ruptures consists of a series of en echelon sub-ruptures represented by a series of compression bulges alternating with tension fissures or by en echelon fissures. The rupture at Changusi, the southernmost of the ruptures, is characterized by vertical displacement, with a value of 50cm. The rupture zone shows left-lateral strike-slip characteristics. The maximal horizontal slip is on the northern main rupture, with a value of 1.8m.
Key words:  MS7.1 Yushu earthquake  Surface rupture zone  Emergency scientific investigation