Regional seismicity triggered by the Ms=7.8 Tangshan event on July 28, 1976 and the static stress field change |
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| Authors: | GUI-PING LIU ZHENG-XIANG FU |
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| Institution: | Center for Analysis and prediction, China Seismological Bureau, Beijing 100036, China |
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| Abstract: | We
studied the seismicity before and after the MS=7.8 Tangshan event on July 28, 1976
(39(28(N, 118(11(E) and the results show that in 3 regions outside of the source zone,
seismicity rate increasing were observed, which was significant in 0.99 significance level
using Z-statistic test and was proposed to be triggered by the MS=7.8 Tangshan earthquake.
The magnitude of the greatest triggered event was 5.5. The epicenter distances of these
earthquakes were several ten kilometers to 300 km. The static stress change (CFS of
Coulomb failure was calculated using an elastic dislocation model in half space and the
(CFS on the major rupture directions in these three regions were positive. |
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| Keywords: | Tangshan earthquake seismicity Coulomb failure stress change |
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