1966年邢台强震群震前、 同震和震后断层运动特征分析

Abstract

Abstract: Based on the leveling observation data of the March 1966 earthquake swarm in Xingtai, this paper compared observed coseismic displacement and results from numerical simulation, thus inferred shallower Niujiaqiaoyang Fault and Yongfuzhuang Fault and a deeper NW oriented, NE trending fault as the causative faults of Xingtai earthquake swarm. Constrained by leveling data, this paper gave the spatial distribution of pre-, co-, and post-seismic movement of the faults. The results show that significant aseismic slip before the earthquake occurs mainly on the causative fault of March 8 M_S6.8 earthquake, and also occurs on the segments in the causative fault of the March 20 Ningjin M_S7.2 and 6.7 earthquakes with weak coseismic displacement. The after slip occurs mainly in the Niujiaqiaoyang Fault in the west of Shulu depression. From the spatial and temporal features of fault movement of the Xingtai earthquake swarm, we conclude that in the process of earthquake rupture nucleation, aseismic slip before the earthquake may occur in causative fault of foreshock, and also may occur in causative fault of mainshock. The distribution of afterslip shows a complementary spatial pattern with coseismic displacement. Whether the aseismic slip before the earthquake is the reason for some of pre-earthquake precursors is an issue worth further studying.

Key words: Fault movement, Level observations, Inversion, The 1966 Xingtai earthquake swarm

CLC Number:

P315.7

SHAO Zhi-gang, LI Yi-wen, WANG Peng. Pre-, Co-, and Post-seismic Fault Movement Features of the 1966 Xingtai Strong Earthquake Swarm[J]. EARTHQUAKE, 2015, 35(3): 1-9.

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Pre-, Co-, and Post-seismic Fault Movement Features of the 1966 Xingtai Strong Earthquake Swarm

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