腾冲及其邻区地壳S波速度结构  

Research on Crustal S-wave Velocity Structure in Tengchong and its Adjacent Regions

作　　者：陈佳[1] 金明培[2] 叶泵[1] 邓嘉美[1] 高琼[1] 王军[1] CHEN Jia;JIN Mingpei;YE Beng;DENG Jiamei;GAO Qiong;WANG Jun(Western Yunnan Earthquake Prediction Study Area, CEA, Dali 671000, Yunnan, China;Yunnan Earthquake Agency, Kunming 650224, Yunnan, China)

机构地区：[1]中国地震局滇西地震预报实验场,云南大理671000 [2]云南省地震局,云南昆明650224

出　　处：《地震研究》2018年第1期125-131,共7页Journal of Seismological Research

基　　金：云南省地震局科技行业专项;云南省地震局"传帮带"项目;云南省陈颙院士工作站共同资助

摘　　要：利用腾冲及其邻区架设的23个台站的远震波形资料,应用接收函数及时间域的线性反演方法反演了各台站下方的S波速度结构,分析该区域的地壳速度结构特征,结果表明:腾冲及其邻区莫霍面深度为39 km左右,整个研究区域地壳厚度从南(32 km)到北(42 km)逐渐增加。不同深度的S波速度结构显示,腾冲附近的中下地壳(30 km附近)呈现为明显低速区,该低速区以腾冲为中心展布,范围约为30 km。低速异常区域与地壳内的岩浆活动和部分熔融物质有关,深部熔融物质为腾冲地区带来了丰富的地热资源。We collected teleseismic waveform data recorded by 23 broadband stations located in Tengchong and its adjacent area and computed the S-wave velocity structure by using the receiver function and linear inversion method in spatial domain. Through analyzing crustal velocity structure in Tengchong,we obtain that the depth of Moho surface of Tengchong and its adjacent area is approximately 39 km. The depths of the study area increase gradually from 34 km in the south to 42 km in the north. The middle and lower crust near Tengchong（ 30 km at depth） shows significantly lower layers,based on the perspective of the S-wave velocity of different depths.The distribution range around the center of Tengchong reaches about 30 km. The lower velocities in the crust are caused by molten or semi-molten magma and the deep molten material has brought rich geothermal resources to the Tengchong region

关 键 词：腾冲 接收函数 S波速度结构 地壳厚度 

分 类 号：P315.21[天文地球—地震学]