Seismicity and stress state in the South China Sea, Indochina and their vicinity |
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| Authors: | Shaoxian Zang Zhongliang Wu and Aibing Li |
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| Institution: | (1) Department of Geophysics, Peking University, 100871 Beijing, China |
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| Abstract: | The distribution of earthquakes from 1973 to 1982 in the South China Sea, Indochina and their vicinity was studied using the
data from I. S. C. It was found that the earthquakes are mainly concentrated along the boundaries of plates. Beside, some
of shallow eartqhuakes are distributed in west part of Burma and the boundary between Burma and China, a few of earthquakes
occurred in South China Sea. The features of Benioff zone along the boundaries between India plate, Philippine Sea plate and
Eurasia plate were studied. The plate do not coupled well under the Java trench and the Philippine trench. The subducted India
plate under Burmese range, Andaman—Nicobar arc moves NNE. The fault plane solutions of earthquakes were studied using the
first motions of P wave. The stress state on subduction zones and within the area were deduced from the fault plane solutions
and the fault movement. It was found that the direction of principal compression axis of stress is in the NNE in west part
of Burma, in S—N in south and middle part of Bruma and Thailand, and in NNE or S—N in the South China Sea. It was also found
that the stress state has close relation with the interaction of plates.
The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,13, 129–137, 1991. |
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| Keywords: | subduction zone fault plane solution interaction between plates stress state |
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