检索结果-南通市图书馆

Fault plane parameters of sanhe-pinggu m8 earthquake in 1679 determined using present-day small earthquakes

earthquake Science 2014年第6期27卷 607-614页

作者： Xiaoshan Wang Xiangdong Feng Xiwei Xu Guiling Diao Yongge Wan Libin Wang Guangqing ma Institute of Geophysics China Earthquake Administration earthquake Administration of Hebei Province Institute of Geology China Earthquake Administration Institute of Disaster Prevention

The great sanhe-pinggu m8 earthquake occurred in 1679 was the largest surface rupture event recorded in history in the northern part of North China plain. This study determines the fault geometry of this earthquake by inverting seismological data of present-day moderate-small earthquakes in the focal area. We relocated those earthquakes with the double-difference method. Based on the assumption that clustered small earthquakes often occur in the vicinity of fault plane of large earthquake, and referring to the morphology of the long axis of the isoseismal line obtained by the predecessors, we selected a strip-shaped zone from the relocated earthquake catalog in the period from 1980 to 2009 to invert fault plane parameters of this earthquake. The inversion results are as follows： the strike is 38.23°, the dip angle is 82.54°, the slip angle is -156.08°, the fault length is about 80 km, the lower-boundary depth is about 23 km and the buried depth of upper boundary is about 3 kin. This shows that the seismogenic fault is a NNE-trending normal dip-slip fault, southeast wall downward and northwest wall uplift, with the right-lateral strike-slip component. moreover, the surface rupture zone, intensity distribution of the earth-quake and seismic-wave velocity profile in the focal area all verified our study result.

关键词： sanhe-pinggu m8 earthquake Present-daymoderate-small earthquakes - Double-differenceearthquake location - Tectonic stress field Fault planeparameter

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