Body waveform inversion for the source process of the February 3, 1996 Lijiang, Yunnan earthquake |
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| Authors: | Yang Xu Masayuki Kikuchi and You-Jin Su |
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| Institution: | (1) Seismological Bureau of Shanxi Province, 030002 Taiyuan, China;(2) Earthquake Research Institute of Tokyo University, Tokyo, Japan;(3) Seismological Bureau of Yunnan Province, 650041 Kunming, China |
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| Abstract: | The source process of February 3, 1996 Lijiang earthquake in Yunnan was studied by body waveform inversion using teleseismic
data from IRIS. Two normal double-couple subevents with different strikes were obtained. The difference of the onset time
between these two subevents, which are 15 km apart in space, is 7 s. The total seismic moment is 3.81 × 1018 Nm (M
w=6.3). The total fault area S is about 720 km2 from the aftershock data and the average dislocation is about ū=0.18 m. Considering both the result of inversion and tectonic environment around the source, the first rupture might result
from the extension along the NNW directed Zhongdian-Yongsheng fault belt where an earthquake of M=6.4 occurred in 1966. Then, the second started along the NE directed the eastern foot of Snow Mountain fault where rupture
seemed to be able to propagate more easily. |
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| Keywords: | inversion source process body wave subevent Lijiang earthquake in Yunnan |
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