2012年6月24日宁蒗—盐源MS5.7地震震源参数研究

Abstract

Abstract: The Ninglang—Yanyuan M_S5.7 earthquake that occurred on June 24, 2012 caused certain death and property loss. To explore seismogenic tectonic of this earthquake, we used regional broadband seismic records based on velocity model extracted from Crust Model 2.0 to invert focal mechanism with cut and paste(CAP) method. The strikes, dips, rakes of best focal mechanism solutions are 189°/59°/-40°and 302°/55°/-141°, respectively. It is a Mw 5.4 normal dominant event with strike slip component. The centorid depth provided by CAP method is 4 km. Two other models were employed to better understand errors introduced by velocity model. The mechanisms and magnitudes are similar, while centroid depths range from 4 km to 6 km which are much shallower than results based on traveltime. sPL phase recorded by LGH and pP phases recorded by Australian seismic stations confirmed that the centorid depth is between 4~8 km. North-West distribution of short term aftershocks (two days after mainshock) suggests that this earthquake occurred at Yongning Fault.

Key words: Source parameters, Focal Mechanism, Ninglang—Yanyuan Earthquake, Focal depth, depth phase

CLC Number:

P315.7

ZENG Xiang-fang, HAN Li-bo, NI Si-dao, SHI Yao-lin. Inversion for Source Parameters of the June 24, 2012 Ninglang—Yanyuan M_S5.7 Earthquake[J]. EARTHQUAKE, 2013, 33(4): 196-206.

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Inversion for Source Parameters of the June 24, 2012 Ninglang—Yanyuan M_S5.7 Earthquake

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Inversion for Source Parameters of the June 24, 2012 Ninglang—Yanyuan MS5.7 Earthquake

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Inversion for Source Parameters of the June 24, 2012 Ninglang—Yanyuan M_S5.7 Earthquake