新疆及周边地区Lg尾波的Q值分布  

DISTRIBUTION OF Lg CODA Q VALUE IN XINJIANG AND ITS ADJACENT REGIONS

作　　者：徐彦[1,2] 毛燕[1] 胡家富[1] 苏有锦[3] 丛连理[1] 

机构地区：[1]云南大学地球物理系 [2]中国昆明650041云南省地震局 [3]云南省地震局

出　　处：《地震学报》2005年第2期155-162,237,共8页Acta Seismologica Sinica

基　　金：国家自然科学基金(49974012);地震科学联合基金(604004)共同资助.

摘　　要：首先运用叠加谱比法,对新疆地区22个数字化台网台站、乌鲁木齐台站以及周边的7个台站1999～2003年上半年所记录的1 156个宽带垂直记录,进行了处理,得到了与各射线相对应的Q0值(1 Hz处的Q值)和频率相关因子η.在此基础上,应用反投影技术,得到了新疆地区1°×1°网格的Q0值和η值的分布图象.结果表明:在塔里木地台及西伯利亚地台边缘,Q0值较高,为300～450;而在南部的西昆仑褶皱系、松潘甘孜褶皱系,Q0呈现出低值,在150～250的范围内变化;在北部的准葛尔褶皱系和天山褶皱系,Q0呈现出较低的值,在250～300的范围内变化,η值的变化范围为0.5～0.9.In the study, we collected 1156 broadband vertical components recorded at 22 digital network stations in Xinjiang region, rümqi station, and 7 stations in the adjacent regions during the period of 1999~2003. The records were firstly processed by the stacked spectral ratio method to obtain Q 0 ( Q at 1 Hz) and the frequency correlation factor η corresponding to each path. Based on the results, the distribution images of Q 0 and η in 1°×1° grids for Xinjiang region were gained by the back projection technique. The results indicate that Q 0 was higher (300~450) in the Tarim platform and the edges of Siberian platform, while Q 0 was lower (150~250) in the southern regions as west Kunlun fold system and Songpan Ganzi fold system. In the northern regions as Junggar fold system and Tianshan fold system, Q 0 was also lower (250~300) and η was varying between 0.5 and 0.9.

关 键 词：LG尾波 Q值 叠加谱比法 反投影技术 新疆地区 

分 类 号：P315.31[天文地球—地震学]