辽宁岫岩M_S5.9地震前应力积累的讨论  

Discussions on Stress Accumulation before the 1999 Xiuyan M_S5.9 Earthquake in Liaoning,China

作　　者：吴晶[1] 太龄雪[1] 高原[1] 石玉涛[1] 焦明若[2] 

机构地区：[1]中国地震局地震预测研究所,北京100036 [2]辽宁省地震局,辽宁沈阳110031

出　　处：《地震》2009年第3期37-44,共8页Earthquake

基　　金：中国地震局地震预测研究所基本科研专项(2007-24)资助

摘　　要：使用营口地震台记录的地震波形资料,对1999年11月29日辽宁岫岩MS5.9地震前后进行剪切波分裂分析,结果表明剪切波分裂参数在岫岩地震前后有明显的变化,慢剪切波时间延迟在岫岩地震前约142天开始增加,揭示了震前的应力积累过程。应力积累的持续时间与震级的关系符合对数坐标下的直线拟合经验统计关系。Using the seismic waveform data from Yingkou station in Liaoning province, China, by the study of shear-wave splittings before and after the Xiuyan Ms5.9（ML5.3） earthquake occurred on 29 November 1999, this paper shows that obvious variations occurred before and after the Xiuyan earthquake, time delays of slow shear-waves started to increase from about 142 days before the Xiuyan earthquake. This result indicates the stress accumulation before the earthquake, and the logarithm of the duration of stress accumulation is proportional to the magnitude of the earthquake.

关 键 词：岫岩地震 应力积累 剪切波分裂 时间延迟 偏振方向 

分 类 号：P315.7[天文地球—地震学]