Magnitude and distance distribution of strong aftershocks in Sichuan-Yunnan region |
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| Authors: | Xiao-jian Lü Meng-tan Gao Zhan-wu Gao and Su-ting Mi |
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| Institution: | (1) Institute of Geophysics, China Earthquake Administration, Beijing, 100081, China;(2) Institute of Earthquake Science, China Earthquake Administration, Beijing, 100036, China |
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| Abstract: | Using the earthquake sequences data with M
S≥6.5 since 1966 in Sichuan-Yunnan region, we research the characteristic of the magnitude difference distribution between
main shocks and their strong aftershocks; and then study the spatial distribution characteristic of the strong aftershocks
away from their main shocks. The result shows that the magnitude difference distribution obeys intercepted exponential distribution,
while the spatial distribution of strong aftershocks obeys normal distribution and the dominated distribution area of strong
shocks is 10∼39 km away from main shock. Finally the probability density function of the magnitude difference distribution
and the spatial distribution of strong aftershocks is deduced.
Contribution No.08FE3009, Institute of Geophysics, China Earthquake Administration. |
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| Keywords: | Sichuan-Yunnan region strong aftershock magnitude difference distribution spatial distribution |
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