山西临汾盆地及其周缘现今地震活动特征与地震危险性分析
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摘要
依据地震地质构造和断裂带几何特征,将临汾盆地及其周缘划分为6个研究区域,运用近27年经过精确定位的区域台网地震资料,采用多个地震活动参数值的组合,结合震源深度分布、历史强震背景,分析临汾盆地及其周缘各研究区的现今活动状态。结果表明,现今应力水平较高的3个区域分别为洪洞—临汾凹陷、侯马凹陷和峨眉台地。其中,洪洞—临汾凹陷为1303年洪洞8.0级地震的破裂区,现今应力水平仍然较高,其中深部出现的小震活动稀疏段可能表明其正处于破裂区的恢复阶段;侯马凹陷至峨嵋台地北缘自有史料记载以来,没有记录到M6以上地震,现今地震活动特征显示其处于较高应力水平下的相对闭锁状态,属于未来强震的危险区段;灵石隆起、辛置凸起和襄汾凸起现今应力水平相对较低,以中小地震活动为主要特征,强震危险性较小。
Based on the seismotectonics and fault zone geometry characteristics,Linfen Basin and its periphery are zoned into six study areas.The current activity of each study area of Linfen basin and its periphery is analyzed,using combinations of multiple seismic activity parameters for precisely repositioned seismic data from regional stations in last 27 years,combined with source depth distribution,historical strong earthquakes.The results show that the three regions with high stress level today are the Hongtong-Linfen depression,Houma depression and Emei platform.Stress level of Hongtong-Linfen depression,as the rupture zone of 1303 Hongtong 8.0 earthquake,remains high,and the small earthquake sparse segment in semi deep section may indicate that the rupture zone is in recovery stage.There has been no M6 earthquake in the region form Houma depression to the north of Emei platform,and the current characteristic of seismic activity shows that this region is behaving locked under relatively high stress,which may indicate strong earthquake risk in the future.Linshi uplift,Xinzhi bulge and Xiangfen bulge are in low stress level mainly being small and medium-sized earthquakes,which may have low risk of strong earthquake.
Based on the seismotectonics and fault zone geometry characteristics,Linfen Basin and its periphery are zoned into six study areas.The current activity of each study area of Linfen basin and its periphery is analyzed,using combinations of multiple seismic activity parameters for precisely repositioned seismic data from regional stations in last 27 years,combined with source depth distribution,historical strong earthquakes.The results show that the three regions with high stress level today are the Hongtong-Linfen depression,Houma depression and Emei platform.Stress level of Hongtong-Linfen depression,as the rupture zone of 1303 Hongtong 8.0 earthquake,remains high,and the small earthquake sparse segment in semi deep section may indicate that the rupture zone is in recovery stage.There has been no M6 earthquake in the region form Houma depression to the north of Emei platform,and the current characteristic of seismic activity shows that this region is behaving locked under relatively high stress,which may indicate strong earthquake risk in the future.Linshi uplift,Xinzhi bulge and Xiangfen bulge are in low stress level mainly being small and medium-sized earthquakes,which may have low risk of strong earthquake.
引文
[1]邓起东,苏宗正,王挺梅,等.临汾盆地地震构造基本特征和潜在震源区的划分[M].山西临汾地震研究与系统减灾.北京:地震出版社,1993:67-95.
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[3]宋美琴,李斌,吕芳,等.2010年1月24日山西河津—万荣Ms4.8地震特征[J].地震地磁观测与研究,2012,33
[4]宋美琴,郑勇,李斌,等.2010年1月24日山西河津—万荣Ms4.8地震的震源机制解与发震构造探讨[J].地震学报,2012,34(1):111-117.
[5]易桂喜,范军,闻学泽.由现今地震活动分析鲜水河断裂带中-南段活动习性与强震危险地段[J].地震,2005,25(1):58-66.
[6]宋美琴,郑勇,葛粲,等.山西地震带中小震精确位置及其显示的山西地震构造特征[J].地球物理学报,2012,55(2):514-525.
[7]易桂喜,闻学泽,范军,等.由地震活动参数分析安宁河一则木河断裂带的现今活动习性及地震危险性[J].地震学报,2004,26(3):294-303.
[2]苏宗正,程新原,安卫平.山西临汾盆地的断陷沉降[M].山西临汾地震研究与系统减灾.北京:地震出版社,1993:102-109.
[3]宋美琴,李斌,吕芳,等.2010年1月24日山西河津—万荣Ms4.8地震特征[J].地震地磁观测与研究,2012,33
[4]宋美琴,郑勇,李斌,等.2010年1月24日山西河津—万荣Ms4.8地震的震源机制解与发震构造探讨[J].地震学报,2012,34(1):111-117.
[5]易桂喜,范军,闻学泽.由现今地震活动分析鲜水河断裂带中-南段活动习性与强震危险地段[J].地震,2005,25(1):58-66.
[6]宋美琴,郑勇,葛粲,等.山西地震带中小震精确位置及其显示的山西地震构造特征[J].地球物理学报,2012,55(2):514-525.
[7]易桂喜,闻学泽,范军,等.由地震活动参数分析安宁河一则木河断裂带的现今活动习性及地震危险性[J].地震学报,2004,26(3):294-303.
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