基于现代地震资料确定汾渭地震带分区及其地震活动性参数  

Subarea and seismicity parameters of the Fen-Wei seismic zone based on the modern seismic data

作　　者：谢卓娟 吕悦军[1] 张力方[1] 王玉婷[1] 方怡[1] 

机构地区：[1]中国地震局地壳应力研究所,北京100085

出　　处：《地球物理学进展》2012年第3期894-902,共9页Progress in Geophysics

基　　金：中央级公益性科研院所基本科研业务专项(ZDJ2010-20)资助

摘　　要：汾渭地震带是我国东部一个强震活动带,其分段特征及地震活动趋势一直是研究热点,过去利用历史地震和地震地质资料,已得到许多有价值的结果.本文以第五代区划图中最新划分的汾渭地震带为研究区域,收集整理1970至2010年ML2.0～5.0级的现代地震资料,计算中小地震能量密度值,定量分析了该带中小地震空间分布图像特征,据此,确定了汾渭地震带的分区,并给出了各分区的地震活动性参数.对比分析表明,对汾渭地震带进行精细分区,可以更加真实地反映区域的地震活动水平,同一地震带的精细分区,可得到代表不同地震活动水平的地震活动性参数.同时,本研究也为地震带的精细划分提供了一种定量分析方法,对地震区划、工程场地地震安全性评价、地震活动中长期预测均有重要意义.The seismic section and seismic trends of Fen-wei seismic zone have attracted much attention in the past decades as it is one of the strongest seismic belts in the eastern part of China. Many valuable results can be deanced by using historical strong earthquake record and the seismologic and geological data. Taking the latest partitioned Fen-wei seismic zone from the fifth seismic ground motion parameter zoning map as research region, we calculated the energy density of minor-moderate earthquakes and quantitatively analyzed the space distribution characteristics of these earthquakes in the region from based on the data of ML 2. 0~ 5. 0 from 1970 to 2010. Accordingly, the partitions of Fen-wei zone can be exactly divided and the parameters of each partition can be summarized. For the same seismic belt, detailed division gives different parameters representing different seismic activity levels, the subtly division method used in this paper shows better performance in representing actual regional seismicty level of the Fen-wei seismic zone. Meanwhile, this paper also provides a quantitative analysis method of subtly division for seismic belt, It has important value for seismic risk zone,seismic safety assessment and earthquake predication.

关 键 词：汾渭地震带 现代中小地震 分区 地震活动性参数 

分 类 号：P315[天文地球—地震学]