温州珊溪水库M_L3.9震群震源参数特征  

Source parameter characteristics of M_L3.9 earthquake swarm occurred in Shanxi reservoir,Wenzhou, Zhejiang Province

作　　者：钟羽云 朱新运 张震峰 

机构地区：[1]浙江省地震局,浙江杭州310013

出　　处：《地震》2004年第3期107-114,共8页Earthquake

基　　金：浙江省科学技术委员会重点项目(991103263)

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.

关 键 词：地震波谱 地震序列 震源参数 地震应力 

分 类 号：P315.3[天文地球—地震学]