用叠加谱比法研究新疆地区Lg尾波Q值的区域性变化  

STUDY OF REGIONAL VARIATIONS OF Lg CODA Q IN XINJIANG USING STACK SPECTRAL RATION METHOD

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

机构地区：[1]云南大学地球物理系,云南昆明650091 [2]云南省地震局,云南昆明650041

出　　处：《云南地理环境研究》2005年第2期6-10,27,共6页Yunnan Geographic Environment Research

基　　金：国家自然科学基金资助项目(49974012).

摘　　要：运用叠加谱比法,对分布于新疆地区的5个台站所记录的51个地震数据进行分析,得出与各射线路径相对应的Lg尾波Q0(Lg尾波在1Hz处的Q)值。结果表明:Q0值呈现出明显的区域性变化特点,与构造活动关系紧密。在较为稳定的塔里木地台,Q0呈现出高值,在350～450之间。在南部构造活动较为激烈的昆仑褶皱系,Q0呈现出较低的值,约为200～250。在构造活动最为激烈的帕米尔地区,Q0值在170～200之间。在北部的天山褶皱系,Q0值约为220～270。准葛尔褶皱系比天山褶皱系的Q0值略高,约为260～290。The stack spectral ratio method was employed to analyze 52 earthquake data recorded by 5 stations located in Xinjiang region. The Lg coda Q0(Lg coda Q at 1 Hz) corresponding to each ray path was thus obtained. Results indicate that Q0 exhibits obviously characteristics that it varies regionally. Q0 correlates with tectonics closely. In stable Tarim platform Q0 exhibits high values, varying between 350～450. In the southern part, Kunlun fold system which is a tectonically active region Q0 exhibits lower values, being about 200～250. In the most tectonically active region, Pamier, Q0 is between 170～200. In the northern Tianshan fold system Q0 varies between 220～270. The Q0 in Zhungeer fold system is slightly higher than that in Tianshan fold system, being about 260～290.

关 键 词：叠加谱比法 LG尾波 品质因子(Q) 新疆 

分 类 号：P315[天文地球—地震学]