[1]YE Jian-qing,CHEN Hui,LIU Xue-jun,et al.Research and Monitoring of the 2006 M5.1 Double Shocks in Yanjin,Yunnan,China[J].Journal of Seismological Research,2008,31(02):134-141.
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Research and Monitoring of the 2006 M5.1 Double Shocks in Yanjin,Yunnan,China
Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume:
31
Number of periods:
2008 02
Page number:
134-141
Column:
Public date:
2008-02-23
- Title:
- Research and Monitoring of the 2006 M5.1 Double Shocks in Yanjin,Yunnan,China
- Keywords:
- near-field earthquake observation; rupture process; source parameter; double shocks; Yanjin of Yunnan
- CLC:
- P315.73
- DOI:
- -
- Abstract:
- Two M5.1 earthquakes occurred in Yanjin,Yunnan,China,in 2006.We located the events with high precision,solved the source parameters of the Yanjin earthquake sequences,and discussed the rupture processes of the Yanjin doublet by using the near-field and regional seismic waveforms.The result shows that the two M5.1 earthquakes lie in the same tectonic region.The main fracture at depth 3-9 km is strike slip with a dimension about 9 km×3 km approximately,a strike about N53°E,and a dip about 80°.The strike of the fracture is consistent with that of the long axis of isoseismals.The seismic moment,rupture radius and stress drop are 109-1016 N·m,90-300 m and 0.000 2-32 MPa respectively in the seismic area.The events with higher stress drop concentrated at depth 5-10 km,so this depth range is the main active zone of the Yanjin earthquakes.The spatial distribution of the aftershocks displays that the main rupture plane of the former M5.1 earthquake has an absent-shock zone at depth 7-9 km,which is regarded as the asperity on main rupture plane,and the following M5.1 earthquake ruptured through the asperity.This suggests that the asperity on the rupture plane resulted in the Yanjin double shocks.So the absent-shock zone mapping is important for earthquake prediction.
- References:
- -
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Last Update:
2008-02-23