川滇地区中小震重新定位与速度结构的联合反演研究

Abstract

Abstract: Using the data of P wave travel time recorded at Yunnan and Sichuan local networks from April 2000 to March 2006, we implemented a simultaneous inversion of earthquake relocation and velocity structure, and got the new location of 6642 small and medium earthquakes in Sichuan-Yunnan region. The results show that: ① There is an obvious relationship between the focal depth and the magnitude. The bigger the magnitude, the deeper the focal depth, but all the focal depths values are shallower than 25 km; ② There are few earthquakes occurred at the depth deeper than 15 km in regions west of Ruili-Longling, Lijiang-Xiaojinhe and Longmenshan faults; ③ Small and medium earthquakes have the similar seismogenic background as large earthquakes. Along the transitional zone of high velocity and low velocity, most of the earthquakes happened at the higher velocity side, and usually there is a low velocity zone below where earthquakes happened.

Key words: Sichuan-Yunnan area, Simultaneous inversion, Earthquake relocation, Velocity structure

CLC Number:

P315.7

MA Hong-sheng, ZHANG Guo-min, ZHOU Long-quan, LIU Jie, SHAO Zhi-gang, XIA Hong. Simultaneous inversion of small earthquakerelocation and velocity structure in Sichuan-Yunnan area[J]. EARTHQUAKE, 2008, 28(2): 29-38.

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Simultaneous inversion of small earthquakerelocation and velocity structure in Sichuan-Yunnan area

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