[1]LIU Zifeng,LONG Feng,PENG Guanling,et al.Analysis on Strong Earthquake Risk in Northwestern Yunnan[J].Journal of Seismological Research,2019,42(03):330-337.
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Analysis on Strong Earthquake Risk in Northwestern Yunnan
Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume:
42
Number of periods:
2019 03
Page number:
330-337
Column:
Public date:
2019-07-24
- Title:
- Analysis on Strong Earthquake Risk in Northwestern Yunnan
- Keywords:
- b-value; consistency parameter of focal mechanism; stress tensor variance; strong earthquake risk; Northwestern Yunnan
- CLC:
- P315.72
- DOI:
- -
- Abstract:
- Using the monthly report catalog provided by Yunnan Seismic Network from Jan.,1965 to Nov.,2018 and the focal mechanisms of small-moderate earthquakes from Jan.,1999 to Oct.,2018,we calculated the spatial distribution characteristics of b-value and focal mechanism consistency parameters in the Northwest Yunnan. And then combined with the seismic gap of historical strong earthquakes,we analyzed the strong earthquake risk in northwest Yunnan. The results show that:①Since Jan.,2000,b-value in the Chenghai fault,southern sections of the Longpan-Qiaohou fault and Weixi-Qiaohou fault has been significantly reduced. And the main area of the low b-value(b<0.7)in the research area is at both ends of Zhongdian fault seismic gap,Chenghai fault zone and its adjacent areas. ②The regions with good consistency in the source mechanism are located in the middle of the Chenghai fault,the southern sections of Longpan-Qiaohou fault and the Weixi-Qiaohou fault and their adjacent areas. It is concluded that the low b-value and the best consistency of the source mechanisms may be due to the increase of regional stress. Based on this,it can be judged that Chenghai fault,the southern sections of Longpan-Qiaohou fault and Weixi-Qiaohou fault and their adjacent areas are the potential seismic hazard areas for strong earthquakes in Northwestern Yunnan in future.
- References:
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Last Update:
2019-07-24