Inversion of long-period body-wave data for the source process of the Gonghe, Qinghai, China earthquake |
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Authors: | Xu Li and Yun-Tai Chen |
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Institution: | (1) Institute of Geophysics, State Seismological Bureau, 100081 Beijing, China;(2) Present address: Seismological Bureau of Sichuan Province, China |
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Abstract: | Long period body waves data recorded by the China Digital Seismograph Network (CDSN) are inverted for the seismic moment tensors
of the April 26, 1990, Gonghe, QinghaiM
S=6.9 earthquake and itsM
S=5.0 after-shock occurred on May 7, 1990. In the inversion, the generalized reflection-transmission coefficient matrix method
is used to generate Green’s function. From the inversion it is obtained that the rupture process of theM
S=5.0 aftershock is relatively simple, and that of the main shock is rather complex. There are at least two events during main
shock rupture process with an interval about 35 seconds. The focal mechanisms of two events are roughly the same as that of
the aftershock, all of them were mainly reverse dip-slipping faulting with minor left-lateral strike-slip motion. These results
indicate that the Gonghe earthquake was the result of the farther extension of one NWW-SEE striking buried fault on the southern
margin of Gonghe basin from shallower depth to deeper depth and from NW to SE under the action of a nearly horizontal NE direction
compressive stress.
Contribution No. 95A0111, Institute of Geophysics, SSB, China. |
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Keywords: | China Digital Seismograph Network (CDSN) body wave Gonghe Qinghai China earthquake source process seismic moment tensor inversion |
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