摘要
本文基于对石棉—西昌地区全新世断层活动与地震活动在时间上、空间上、强度上不均匀性的认识,结合四川省近廿年来对该区地震趋势估计,采用地震危险性概率分析方法,编制了此区50年超越概率10%的地震烈度和地表基岩水平峰值加速度区划图。区划结果表明,烈度和加速度的最高值均位于冕宁以南—西昌一带,这与该段全新世地表破裂最强烈、断错地貌和古地震遗迹相对集中、强震活动频繁具有较好的一致性;区划图等烈度线和等加速度线的总体分布形态近呈南北,与断裂走向基本一致。
in this paper, the two seismic zoning maps with exceedance probability of 10% in 50 years are given through using the method of seismic hazard analysis and in the light of understanding fault activity of Shimian-Xichang area in Ho-locence and seismicity inhomogeneity in time, location and magnitude and estimating the earthquake tendency in this area. Zoning results show that the maximum values of intensity and acceleration appear from southern Mianning to Xichang, which is in good accordance with the features in the region, such as violent surface ruptures in Holocence, geomorphic structure of dislocation and palaeoseismic traces and frequent strong seismic activity. The cotours of intensity and acceleration generally spead out in SN direction coinsiding roughly with fault strike.
出处
《地震研究》
CSCD
北大核心
1993年第3期306-315,共10页
Journal of Seismological Research
关键词
地震
区划
石棉地区
西昌地区
四川
Sieismic zoning, Fault of Holocence, Seismicity inhomogeneity in time, location and magnitude, Seismic Hazard analysis, Shimian-Xichang area.
