新疆北天山2次5级地震的尾波衰减系数研究  

STUDY ON ATTENUATION COEFFICIENT OF CODA WAVES FOR TWO M_S5.0 EARTHQUAKES IN NORTHERN TIANSHAN MOUNTAIN,XINJIANG

作　　者：李志海[1] 黄瑜[2] 曲延军[1] 王筱荣[1] 

机构地区：[1]新疆维吾尔自治区地震局,新疆乌鲁木齐830011 [2]新疆维吾尔自治区地震局喀什地震台,新疆喀什844000

出　　处：《内陆地震》2009年第3期337-344,共8页Inland Earthquake

基　　金：中国地震局监测预报司"数字地震学短临预报方法研究"项目;新疆地震科学基金(200503)资助

摘　　要：计算分析了新疆乌苏台记录的2002～2006年间其附近Ms≥0地震的尾波衰减系数值，发现中小地震震级、震中距、震源深度与尾波衰减系数值无关。针对在此期间北天山发生的2003年2月14日石河子Ms5．4地震和2006年11月23日乌苏肘。5．1地震，分析了其震前孕震区和非孕震同等大小区域地震的尾波衰减系数值，发现孕震区地震的尾波衰减系数值在震前出现了低值过程，非孕震区地震的尾波衰减系数值在均值附近浮动，孕震区地震的尾波衰减系数平均值比非孕震区小。The attenuation coefficient value of coda waves of earthquakes with Ms ≥0 from 2002 to 2006 recorded by Wusu seismic station were calcuted, analyzing them found they are independent for magnitude of middle-small earthquakes, epicenter distance, focal depth and attenuation coffeicient value of coda waves. Before Shihezi Ms5.4 earthquake occurred in Feb. 14, 2003 and Wusu Ms5. 1 earthquake occurred in Nov. 23,2006 , there are low value course for the attenuation coffiecient value of coda waves of earthquakes in the earthquake genesis area and the average value is lower than the average value in other region. In the end, the explaination was given to the result.

关 键 词：新疆 北天山 尾波衰减系数 孕震区 

分 类 号：P315.3[天文地球—地震学]