Study on Potential Strong Earthquake Risks Around the Mabian Area,Southern Sichuan |
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| Authors: | Yi Guixi Wen Xueze Zhang Zhiwei Long Feng Ruan Xiang and Du Fang |
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| Institution: | 1) Earthquake Administration of Sichuan Province,Chengdu 610041,China 2)Chengdu University of Technology,Chengdu 610059,China;1) Earthquake Administration of Sichuan Province,Chengdu 610041,China 2)Chengdu University of Technology,Chengdu 610059,China;1) Earthquake Administration of Sichuan Province,Chengdu 610041,China 2)Chengdu University of Technology,Chengdu 610059,China;1) Earthquake Administration of Sichuan Province,Chengdu 610041,China 2)Chengdu University of Technology,Chengdu 610059,China;1) Earthquake Administration of Sichuan Province,Chengdu 610041,China 2)Chengdu University of Technology,Chengdu 610059,China;1) Earthquake Administration of Sichuan Province,Chengdu 610041,China 2)Chengdu University of Technology,Chengdu 610059,China |
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| Abstract: | Based on seismic data from the regional network for the last 34 years,we analyzed the present fault behavior of major fault zones around the Mabian area,southern Sichuan,and identified the risky fault-segments for potential strong and large earthquakes in the future.The method of analysis is a combination of spatial distribution of b-values with activity background of historical strong earthquakes and current seismicity.Our results mainly show:(1) The spatial distribution of b-values indicates significant heterogeneity in the studied area,which reflects the spatial difference of cumulative stress levels along various fault zones and segments.(2) Three anomalously low b-value areas with different dimensions were identified along the Mabian-Yanjin fault zone.These anomalies can be asperities under relatively high cumulated stress levels.Two asperities are located in the north of Mabian county,in Lidian town in western Muchuan county,and near Yanjin at the south end of the fault zone.These two areas represent potential large earthquake seismogenic sites around the Mabian area in the near future.Besides them,the third relatively smaller asperity is identified at southern Suijiang,as another potential strongearthquake source.(3) An asperity along the southwestern segment of the Longquanshan fault zone indicates the site of potential moderate-to-strong earthquakes.(4) The asperity along the segment between Huangmu town in Hanyuan county and Longchi town in Emeishan city on Jinkouhe-Meigu fault has potential for a moderate-strong earthquake. |
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| Keywords: | Spatial distribution of b-values Asperities Mabian area Strong earthquake risk |
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