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The great Tancheng earthquake of M81/2 occurred in 1668 was the largest seismic event ever recorded in history in eastern China.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 and found focal mechanism solutions using gird test method.The inversion results are as follows:the strike is 21.6°,the dip angle is 89.5°,the slip angle is 170°,the fault length is about 160 km,the lower-boundary depth is about 32 km and the buried depth of upper boundary is about 4 km.This shows that the seismic fault is a NNE-trending upright right-lateral strike-slip fault and has cut through the crust.Moreover,the surface seismic fault,intensity distribution of the earthquake,earthquake-depth distribution and seismic-wave velocity profile in the focal area all verified our study result.
The great Tancheng earthquake of M81 / 2 occurred in 1668 was the largest seismic event ever recorded in history in eastern China. 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 and found focal mechanism solutions using the gird test method. The inversion results are as follows: the strike is 21.6 °, the dip angle is 89.5 °, the slip angle is 170 °, the fault length is about 160 km, the lower-boundary depth is about 32 km and the buried depth of upper boundary is about 4 km. This shows that the seismic fault is a NNE-trending upright right-lateral strike-slip fault and has cut through the crust.Moreover, the surface seismic fault, intensity distribution of the earthquake, earthquake-depth distribution and seismic-wave velocity profile in the focal area all verified our study result.