【摘要】 利用玉树、曲玛莱、杂多地震台观测到的数字震相资料,研究玉树Ms7.1级地震前后波速比时间演化特征。研究发现:3个台站平均波速比、波速比标准偏差在地震前后变化不相同,Ms4.7级前震发生时3个台站波速比都出现较明显的高值回返现象,其中玉树地震台波速比数值高达2.032。更多还原

【Abstract】 Using the digital seismic phase data observed by Yushu,Qumalai and Zaduo seismic stations,the characteristics of wave velocity ratio evolution before and after Yushu Ms7.1 earthquake are analyzed.The results show that the mean values of wave velocity ratio and standard deviation were not same before and after Yushu Ms7.1 earthquake in those stations,there was an obvious phenomenon of high-value return in all these stations when the Ms4.7 foreshock occurred,the wave velocity ratio of Yushu station was 2.032.更多还原