腾冲火山区S波速度结构接收函数反演  

S-WAVE VELOCITY STRUCTURE INFERRED FROM RECEIVER FUNCTION INVERSION IN TENGC-HONG VOLCANIC AREA

作　　者：贺传松[1] 王椿镛[1] 吴建平[1] 

机构地区：[1]中国地震局地球物理研究所,中国北京100081

出　　处：《地震学报》2004年第1期11-18,共8页Acta Seismologica Sinica

基　　金：国家基础研究发展规划项目(G19980 4 0 70 0 /子课题95 13 0 2 0 3)资助

摘　　要：腾冲火山区临近印度板块与欧亚板块碰撞、俯冲的边界 ,火山活动与构造环境关系密切 .采用远震接收函数反演的方法揭示了该区域的深部结构特征 .结果显示 ,腾冲火山区S波低速结构明显受到NE向大盈江断裂的影响 ,断裂的南部存在明显的S波低速结构 ,断裂的北部低速结构不十分明显 .火山区存在浅部的低速结构 ,低速结构与地震活动性存在对应关系 .证实了低速结构是火山区热活动的直接因素 ,并认为腾冲火山区存在再次活动的基本条件 .Tengchong volcanic area is located near the impinging and underthrust margin of India and Eurasia plates. The volcanic activity is closely related to the tecton ic environment. The deep structure characteristics are inferred from the receive r function inversion with the teleseismic records in the paper. The results show that the low velocity zone is influenced by the NE-trending Dayingjiang faul t. The S-wave low velocity structure occurs obviously in the southern part of t he fault, but unobviously in its northern part. There are low velocity zones in the shallow position, which coincides with the seismicity. It also demonstrates that the low velocity zone is directly related to the thermal activity in the vo lcanic area. Therefore, we consider that the volcano may be alive again.

关 键 词：S波速度结构 热活动 接收函数 腾冲火山区 深部构造 

分 类 号：P315.3[天文地球—地震学]