沂沭断裂带及其附近地区尾波衰减特征  

Characteristics of Coda Wave Attenuation in Yishu Fault and Its Adjacent Area

作　　者：李霞[1] 刘希强[1] 李小晗[1] 赵金花[1] LI Xia;LIU Xiqiang;LI Xiaohan;ZHAO Jinhua(Shandong Earthquake Agency,Jinan 250102,Shandong,China)

机构地区：[1]山东省地震局

出　　处：《地震研究》2019年第3期372-378,共7页Journal of Seismological Research

基　　金：山东省地震局重点基金(JJ1701);山东省地震局数字地震学应用团队联合资助

摘　　要：依据沂沭断裂带及其附近地区断裂特征和应力场分布的分段特性将其划分为4个子区域,利用改进后的尾波Qc值测定方法计算了2010—2017年各子区域内ML≥2.0地震的尾波Qc值,并对其空间分布特征进行了研究。结果显示:①沂沭断裂带尾波Qc值(1Hz时的Qc值)整体差异不大,但显示出较好的分段特性,即莱州湾和附近海域平均尾波Qc值(34.95)明显高于其它区段,潍坊—孟疃段(23.22)、新沂—宿迁段(21.12)平均尾波Qc值相对偏低;②尾波Qc值空间分布与区域介质的地壳构造特点及地质环境关系紧密,揭示了沂沭断裂带作为构造边界带的属性。According to the characteristics of the tectonic fault and stress field orientation in the Yishu fault zone and its adjacent area,we divided the study area into four sub-areas. Then we calculated the Qc value of ML≥2.0 earthquakes in each sub-areas from 2010 to 2017 by the improved Qc-value measurement method,and studied the temporal and spatial distribution characteristics. The results show that:①The Qc value of the coda wave( Qc value at 1 Hz)of Yishu fault changes a little overall,but the segmentation characteristics is significant,that is the average Qc value(34.95)in Laizhou Bay and its adjacent sea areas is significantly higher than that of other sections. The average Qc value of the Weifang-Mengtuan section(23.22),Xinyi-Suqian section(21.12)is relatively low;②The spatial distribution of the coda wave Qc value is closely related to the structural characteristics of the regional crustal medium,which clearly revealed the attributionof Yishu fault as the structural boundary zone.

关 键 词：尾波衰减 方法改进 空间分布 沂沭断裂带 

分 类 号：P315.23[天文地球—地震学]