南北地震带地震震源机制解和现今应力特征

Abstract

Abstract: Using the CAP method, the focal mechanisms of 466 M≥3.5 events that occurred in the North-South Seismic Belt from January 2009 to October 2017 have been obtained. Combining the results of 259 focal mechanisms (M≥4.5) from January 1976 to August 2017 from the GCMT, we investigated the characteristics of focal mechanisms and stress in the North-South Seismic Belt of China. The spatial distributions of focal mechanisms differ among different faults and blocks. It is consistent with active tectonics along the North-South Seismic Belt, mostly in eastern margin of the Tibetan Plateau. Under the complex dynamic environment in eastern margin of the Tibetan Plateau, the P axes directions vary much inside the North-South Seismic Belt. The P axes in the northern section of the North-South Seismic Belt are NE direction. In and surround the Longmenshan fault zone the P axes are nearly EW direction except the NE segment which are NW direction. Inside the Sichuan-Yunnan rhombic block the P axes are NNW direction, while in the west of the west boundary are NNE direction, in the east of the east boundary are NW direction. The stress direction transition bands correspond well with the Sichuan-Yunnan rhombic block boundary. Overall, the P axes in the North-South Seismic Belt and its neighbor area have a clockwise rotational pattern from north to south.

Key words: North-South Seismic Belt of China, Focal mechanism, CAP method, Stress

CLC Number:

P315.7

CUI Zi-jian, CHEN Zhang-li, WANG Qin-cai, LI Jun. Characteristics of Focal Mechanism and Stress in the North-South Seismic Belt of China[J]. EARTHQUAKE, 2019, 39(1): 1-10.

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Characteristics of Focal Mechanism and Stress in the North-South Seismic Belt of China

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