川滇地区三维P波速度结构反演与构造分析

马宏生; 张国民; 闻学泽; 周龙泉; 邵志刚

Volume 33 Issue 5

Sep. 2008

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Article Navigation > Earth Science > 2008 > 33(5): 591-602

MA Hong-sheng, ZHANG Guo-min, WEN Xue-ze, ZHOU Long-quan, SHAO Zhi-gang, 2008. 3-D P Wave Velocity Structure Tomographic Inversion and Its Tectonic Interpretation in Southwest China. Earth Science, 33(5): 591-602.

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3-D P Wave Velocity Structure Tomographic Inversion and Its Tectonic Interpretation in Southwest China

1.
Institute of Earthquake Science, China Earthquake Adminstration, Beijing 100036, China
2.
Institute of Geophysics, China Earthquake Adminstration, Beijing 100081, China
3.
Earthquake Adminstration of Sichuan Province, Chengdu 610041, China
4.
China Earthquake Network Center, Beijing 100036, China

Received Date: 2008-05-10
Publish Date: 2008-09-25

Abstract

Abstract

We have selected about 60000 arrival times recorded by 205 regional stations, with the seismic tomography theory and three dimensional ray tracing method, to determine a detailed three-dimensional (3-D) P wave velocity structure of the lithosphere in southwest China. Then we present the medium structure and tectonic characteristics of different depth which are reflected by the 3-D P wave velocity image in this area, integrated with the previous geological features and geophysical data. The results suggest that deposit basins and alpine mountainous regions present as negative anomaly, with some montage negative anomalies even extending to the deep crust or the upper mantle, which reflects the sharp rising of the new orogens and the concomitant gravity equilibrium; low-velocity layers exist far and wide in the middle and deep crust under the large fault zones around the Sichuan-Yunnan block, which can be taken as the decoupling layer adjusting the faults and blocks movement; some deep structures related with the main active faults, and the trends and extending depths can be distinguished from the P wave velocity image.
- Sichuan-Yunnan area,
- P wave,
- 3-D velocity structure,
- tectonic interpretation

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References(57)

References

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3-D P Wave Velocity Structure Tomographic Inversion and Its Tectonic Interpretation in Southwest China

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