Surface rupture zone of the 1303 Hongtong M=8 earthquake, Shanxi Province |
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| Authors: | Jiang Wa-li Deng Qi-dong Xu Xi-wei and Xie Xin-sheng |
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| Institution: | (1) Institute of Crustal Dynamics, China Earthquake Administration, 100085 Beijing, China;(2) Institute of Geology, China Earthquake Administration, 100029 Beijing, China |
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| Abstract: | Based on the latest displacement of Huoshan piedmont fault, Mianshan west-side fault and Taigu fault obtained from the beginning
of 1990’s up to the present, the characteristics of distribution and displacement of surface rupture zone of the 1303 Hongtong
M=8 earthquake, Shanxi Province are synthesized and discussed in the paper. If Taigu fault, Mianshan west-side fault and Huoshan
piedmont fault were contemporarily active during the 1303 Hongtong M=8 earthquake, the surface rupture zone would be 160 km long and could be divided into 3 segments, that is, the 50-km-long
Huoshan piedmont fault segment, 35-km-long Mianshan west-side fault segment and 70-km-long Taigu fault segment, respectively.
Among them, there exist 4 km and 8 km step regions. The surface rupture zone exhibits right-lateral features. The displacements
of northern and central segments are respectively 6–7 m and the southern segment has the maximum displacement of 10 m. The
single basin-boundary fault of Shanxi fault-depression system usually corresponds to M≈7 earthquake, while this great earthquake (M=8) broke through the obstacle between two basins. It shows that the surface rupture scale of great earthquake is changeable.
Foundation item: Joint Seismological Science Foundation of China (No. 201017).
Contribution No. 2003A009, Institute of Crustal Dynamics, China Earthquake Administration. |
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| Keywords: | M=8 earthquake surface rupture zone changeability of rupture scale |
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