【摘要】 利用数字化地震资料,对玉树地区2006年5.0、5.6级和2010年7.1级地震的震源机制解、尾波Q值、波速比及应力降等进行了对比研究,结果表明2010年玉树7.1级地震为走滑型与该地区历史地震的震源机制一致。2个地震序列的尾波Q值、波速比和应力降存在明显的不同,特别是玉树7.1级地震前的Ms4.7级地震出现显著差异,应力降值在地震序列的活跃、平静段表现出不同的特征。更多还原

【Abstract】 The focal-mechanism solution,coda wave Q-value,V P / V S ratio and stress drop of Ms 5.6 and Ms 5.0 earthquakes in 2006 and Ms 7.1 earthquake in 2010 in Yushu area of Qinghai province are comparatively studied by using the digital seismic data,the results show that the slide of the Ms 7.1 earthquake is consistent with the historical earthquake focal-mechanism solution.The coda wave Q-value,V P / V S ratio and stress drop of the two earthquake sequences are quite different,especially the obviously precursors appeared in the Ms 4.7 earthquake before Yushu 7.1 earthquake,stress drop values characterized different in the active and quiet periods in the two sequences.更多还原