1970年通海7.7级大地震强余震触发

Abstract

Abstract: The Tonghai great earthquake occurred on Jan. 5, 1970 in Yunnan Province. After the main shock, several large aftershocks (M_S>5.0) occurred. Calculations of the change in Coulomb failure stress on aftershock failure plane reveal that 4 events among 5 large aftershocks occurred in areas with ΔCFS>0 (10^-2~10^-1 MPa); There are two contrary results for one aftershock due to two different focal mechanism, this aftershock occurred in areas with ΔCFS>0 and ΔCFS<0. It is concluded that the permanent fault displacement due to the main shock is the main causation of activity of large aftershocks.

Key words: Earthquake triggering, Coulomb failure stress, Tonghai great earthquake

CLC Number:

P315.72

HAO Ping, FU Zheng-xiang, TIAN Qin-jian, LIU Gui-ping, LIU Jie. The tress triggering of large aftershocks following the 1970 Tonghai great earthquake (M=7.7)[J]. EARTHQUAKE, 2004, 24(2): 38-46.

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The tress triggering of large aftershocks following the 1970 Tonghai great earthquake (M=7.7)

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