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地震 ›› 2004, Vol. 24 ›› Issue (3): 107-114.

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温州珊溪水库ML3.9震群震源参数特征

钟羽云, 朱新运, 张震峰   

  1. 浙江省地震局, 浙江 杭州 310013
  • 出版日期:2004-07-31 发布日期:2021-11-29
  • 作者简介:钟羽云(1966-), 男, 江西瑞金人, 硕士, 高级工程师, 主要从事地震预报等研究。
  • 基金资助:
    浙江省科学技术委员会重点项目(991103263)

Source parameter characteristics of ML3.9 earthquake swarm occurred in Shanxi reservoir,Wenzhou, Zhejiang Province

ZHONG Yu-yun, ZHU Xin-yun, ZHANG Zhen-feng   

  1. Earthquake Administration of Zhejiang Province, Hangzhou 310013, China
  • Online:2004-07-31 Published:2021-11-29

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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=1.07 ML+10.3; 占地震总数60%的小震应力降为0.018~0.049 MPa, 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。

关键词: 珊溪震群, 地震波谱, 震源参数

Abstract: Based on the spectral analysis of moderate and small earthquakes occurred in 2002 in Shanxi reservoir, Wenzhou, Zhejiang Province, we calculated seismic moment M0, source radius a, stress drop et al. The results show: ① the relation between seismic moment and magnitude: log M0=1.07 ML+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.

Key words: Shanxi earthquake swarm, Spectral analysis, Source parameter

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