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.
出处
《地震》
CSCD
北大核心
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)
关键词
地震波谱
地震序列
震源参数
地震应力
Shanxi earthquake swarm
Spectral analysis
Source parameter
