Lower crustal attenuation in northeastern Tibetan Plateau from ML amplitude

查看全文 作　　者：Yanbing [1,2]Liu;Shunping [2]Pei

机构地区：[1]Beijing Earthquake Agency,Beijing 100080,China;[2]State Key Laboratory of Tibetan Plateau Earth System,Resources and Environment(TPESRE),Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100101,China

出　　处：《Earthquake Science》索引2021年第34卷第4期,共9页

基　　金：supported by the National Natural Science foundation of China(Nos.41174036,41374091 and 41321061);the Chinese Academy of Sciences(No.KZCX2-EW-QN102)All figures are drawn by GMT. 摘　　要：This study investigated the crustal attenuation structures of Sg and Lg waves of the northeastern Tibetan Plateau.We collected ML amplitude data recorded at 168 permanent stations between 1985 and 2016 and 11 temporary broadband stations between 2014 and 2016.Detailed Q0 variation maps of Sg and Lg waves were obtained by applying ML amplitude tomography.The average Q0 values of the Sg and Lg wave were 440 and 220,respectively.Relatively high attenuation anomalies of both waves appeared in the central and eastern regions of the Bayan Har Block and the east edge of the Qiangtang Block,which may be related to partial melting,high geotemperature,and strong tectonic processes.High attenuation anomalies were also found in the Qilian Orogenic Belt and Hetao Graben,which may be related to their active tectonic behavior and densely distributed faults.The relatively low attenuation anomalies of both waves were revealed in the Alax and Ordos blocks,Qaidam,Tarim,Qinghai Lake,and Gonghe basins,which can be explained by the tectonically stable properties and ancient composition of geological elements.These results indicate that the path between the highly attenuated lower crust of the Bayan Har Block and the Qilian Orogenic Belt is obstructed by three adjacent low attenuated areas(i.e.,the Qilian,Qinghai Lake,and Gonghe basins);thus,it appears unlikely that a crustal flow channel from the interior of the Tibetan Plateau to the Qilian Orogenic Belt will form. 关键词：lower crust ATTENUATION northeastern Tibetan Plateau Q value

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Lower crustal attenuation in northeastern Tibetan Plateau from ML amplitude

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