温州珊溪水库M_L3.9震群震源参数特征

英文篇名：Source parameter characteristics of M_L3.9 earthquake swarm occurred in Shanxi reservoir,Wenzhou, Zhejiang Province
中文刊名：地震
英文刊名：Earthquake
作者：钟羽云 ; 朱新运 ; 张震峰
英文作者：ZHONG Yu-yun ; ZHU Xin-yun ; ZHANG Zhen-feng (Earthquake Administration of Zhejiang Province ; Hangzhou 310013 ; China)
中文关键词：珊溪震群 ; 地震波谱 ; 震源参数
英文关键词：Shanxi earthquake swarm ; Spectral analysis ; Source parameter
出版日期：2004-08-26
机构：浙江省地震局,浙江省地震局,浙江省地震局浙江杭州　310013 ,浙江杭州　310013 ,浙江杭州　310013
年：2004
期：03
出版单位：地震

摘要

采用地震波谱方法测定了温州珊溪水库地震序列的震源参数,分析了震源应力降特征及地震矩与震级的关系。研究结果认为:珊溪震群地震矩和震级统计关系为logM0=1.07ML+10.3;占地震总数60%的小震应力降为0.018～0.049MPa,珊溪震群属于低应力背景下的地震活动;珊溪震区应力降分维数D=0.85,属于低值,反映了震区介质强度和应力分布的非均匀程度较高。
Based on the spectral analysis of moderate and small earthquakes occurred in 2002 in Shanxi reservoir, Wenzhou, Zhejiang Province, we calculated seismic moment M_0, source radius a, stress drop et al. The results show: ① the relation between seismic moment and magnitude: log M_0=1.07 M_L+10.3; ② stress drop of 60% earthquakes are from 0.018 MPa. If>0.049 MPa we think that tress of the earthquake region was anomalous. The stress now is normal; ③ stress drop of earthquake region is fractal, the fractal dimension D=0.85 is a low value; it indicates that strength of media and stress distribution in earthquake region are inhomogeneous.

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