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›› 2003, Vol. 20 ›› Issue (1): 50-55.DOI: 10.7523/j.issn.2095-6134.2003.1.008

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Data Processing of Nearfield Earthquake Records in Jiashi Earthquake Region--3-D Velocity Tomograthy

Lai Xiaoling, Zhang Xiankang, Li Songlin   

  1. Research Center of Exploration Geophysics, CSB, Zhengzhou 450002, China
  • Received:2002-02-07 Revised:2002-05-27 Online:2003-01-18

Abstract:

A joint inversion of 3 D velocity structure and hypocenter positions was used in Jiashi nearfield data processing. Velocity imaging over the depth of 20 km has been obtained. The results show that velocity structure over the depth of 8 km is strongly and horizontally heterogeneous. Characteristics of sedimentary cover of several kilometers in this region is revealed. Velocity imaging at 12~18 km depths shows two low velocity zones, one trending NE and the other NW. They intersect below the meizoseismal area, revealing characteristics of earthquake occurrence tectonics in this region. Obvious difference exist in crust structure along the EW and the SN direction in the meizoseismal area and on the two sides of the strong earthquake sequence zone. This is one of the deep backgrounds of strong earthquakes development.

Key words: near-field earthquake data, three-dimensional velocity inversion, Jiashi earthquake swarm

CLC Number: