Spatiotemporal distribution of seismic activity in East Asia and its relation to regional stress field |
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| Authors: | Jiren Xu Zhixin Zhao and Kazuo Oike |
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| Institution: | (1) Lanzhou Earthquake Research Institute, State Seismological Bureau, 730000 Lanzhou, China;(2) Institute of Geophysics, State Seismological Bureau, 100081 Beijing, China;(3) Geophysical Institute, Faculty of Science, Kyoto University, 606 Kyoto, Japan;(4) Present address: Disaster Prevention Research Institute, Kyoto University, Gokasho Uji, 611 Kyoto, Japan |
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| Abstract: | Tectonic forces from the relative movements between plates are transmitted into the continental crust, and then they create
the earthquake generating stress field there. The space-time distribution of the seismic activity including the small earthquakes
in a region reflects the variation of the stress field in the region.
According to this idea, the characteristics of the stress fields in the various regions of East Asia have been analyzed in
detail in this paper based on a lot of solutions of focal mechanisms and data of seismic activity during the last 500 years.
The results indicate that the tectonic forces from the subduction of the Pacific Ocean plate underneath the Eurasian plate
control the stress field in the region from North China to the northern part of the North-South Seismic Belt.
The variation of the regional stress field shown by the variation of seismic activity in some regions of Japan has also been
discussed based on characteristics of variation of the seimicity of small earthquakes.
Synchronous variations of seismicity in the past 100 years or so in West China and in the boundary region between the Indo-Australian
and Eurasian plates implicate that there is the transmission of tectonic forces into West China through the collision between
the Indo-Australian and Eurasian plates. The active seismic activity in the boundary region between the Indo-Australian and
the Eurasian plates and in West China is continuing consistently.
The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,13, 287–294, 1991. |
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| Keywords: | seismic activity earthquake-generating stress regional stress field tectonic force relative movement of plates |
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