安宁河—则木河断裂带地震视应力研究  

Study on the Apparent Stress of the Earthquakes on Anninghe-Zemuhe Fault

作　　者：乔慧珍[1] 程万正[2] 陈学忠[3] 

机构地区：[1]中国科学技术大学空间与地球科学系,合肥230026 [2]四川省地震局,成都610041 [3]中国地震局地球物理研究所,北京100081

出　　处：《地震研究》2006年第2期125-130,共6页Journal of Seismological Research

基　　金：地震科学联合基金课题(105004);十五项目<强地震短期预测及救灾技术研究>(2004BA601B01-02)资助

摘　　要：利用四川和云南数字遥测地震台网的数字地震记录资料,研究了包括地震视应力在内的震源参数。首先对资料进行预处理,然后计算地动位移和速度的功率谱积分,再计算地震辐射能量和视应力等震源参数。根据计算结果分震级区间研究了视应力值沿安宁河—则木河断裂带的分布情况,及该断裂带上中等地震的震源谱及参数差异,认为安宁河断裂带视应力相对更高。From the records of the regional digital telemetric seismic networks in Sichuan and Yunnan, we select 56 earthquakes that occurred on the Anninghe-Zemuhe fault, calculate their comer frequency, zero frequency limit, rupture radius, seismic energy, seismic moment, stress drop and apparent stress, and study the distribution of the apparent stress. The results show that the apparent stress is high on the Anninghe fault, and the risk to occur the destructive earthquake on its Shimian-Xichang segment is more than that on the Zemuhe fault.

关 键 词：布伦位错模式 震源参数 拐角频率 应力降 视应力 安宁河-则木河断裂带 

分 类 号：P315.3[天文地球—地震学]