潮汐应力与大震关系研究

Abstract

Abstract: In this paper, we focused on global earthquakes with M_W≥7.0 and hypocenter depths less than or equal to 70 km from the Harvard Centroid Moment Tensor (CMT) catalog during the period from 1976 to 2009. We obtained fault plane solutions of 233 earthquakes by choosing the real fault plane of each earthquake through the focal mechanism solution. Based on this, we discussed the relationship between the direction of tidal shear stress on the real fault plane and slip direction. At the same time, the phases of tidal normal stress and Coulomb failure stresses on the fault plane in the origin time are calculated. The results show that there are obvious triggering effects when the direction of tidal shear stress is the same with the slip direction, while earthquakes rarely occur when tidal shear stress goes in the opposite directions, and reverse fault earthquakes have the closest relationship with tide.

Key words: Tidal normal stress, Tidal shear stress, Tidal phase, Slip direction, Triggering

CLC Number:

P315.7

LI Zhi-rong, ZHANG Xiao-dong. Relationship of Tidal Stress and Large Earthquakes[J]. EARTHQUAKE, 2011, 31(4): 48-57.

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Relationship of Tidal Stress and Large Earthquakes

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