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Pn anisotropic tomography and dynamics under eastern Tibetan plateau

文献类型：期刊论文

作者Lei, Jianshe1; Li, Yuan1; Xie, Furen1; Teng, Jiwen2; Zhang, Guangwei1; Sun, Changqing1; Zha, Xiaohui1
刊名JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
出版日期2014-03-01
卷号119期号:3页码:2174-2198
ISSN号2169-9313
DOI10.1002/2013JB010847
文献子类Article
英文摘要We present a new anisotropic tomographic model of the uppermost mantle around eastern Tibet using Pn traveltime data from a newly deployed temporary seismic array and recent observation bulletins of Chinese provincial networks. Our results are generally consistent with previous results but provide new insights into the dynamics of Tibetan plateau. Prominent high-velocity (high-V) anomalies are visible under Alashan block and Qaidam and Sichuan basins, which clearly outline their tectonic margins. A distinct high-V zone representing the double-sided subduction of Indo-Eurasian plates is imaged from Lhasa block to the south of Qaidam basin. A pronounced low-velocity (low-V) zone is observed from Songpan-Ganzi block to southern Chuan-Dian diamond block, suggesting the existence of hot material upwelling there. Crustal strong earthquakes frequently occurred around high-V anomalies or transition zones from high-V to low-V anomalies, suggesting that these earthquakes could be related to lateral heterogeneities in the mantle. The Pn fast direction approximately rotates around Eastern Himalayan Syntaxis, and it is tangential to the margins of Sichuan basin, suggesting that the mantle material flow of Tibetan plateau may have affected east China. In the Yunnan region to the south of 26 degrees N, the Pn fast direction is different from SKS splitting results, indicating that the mantle lithosphere could bemechanically decoupled at certain depth below the uppermost mantle, which might be attributable to the subduction of Indian (or Burma) slab. Although the correlation between anisotropy and velocity is complicated, anisotropy strength could be associated with the pattern of velocity anomalies in the region.
WOS关键词3-DIMENSIONAL VELOCITY STRUCTURE ; UPPERMOST MANTLE VELOCITIES ; AMBIENT SEISMIC NOISE ; WAVE ARRAY TOMOGRAPHY ; LOWER CRUSTAL FLOW ; SURROUNDING REGIONS ; RECEIVER FUNCTIONS ; WENCHUAN EARTHQUAKE ; 2-STATION ANALYSIS ; YUNNAN REGION
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000336844700036
出版者AMER GEOPHYSICAL UNION
资助机构National Natural Science Foundation of China(41274059 ; National Natural Science Foundation of China(41274059 ; Basic Science and Research Special Project(ZDJ2009-01) ; Basic Science and Research Special Project(ZDJ2009-01) ; 40974021 ; 40974021 ; 40774044) ; 40774044) ; National Natural Science Foundation of China(41274059 ; National Natural Science Foundation of China(41274059 ; Basic Science and Research Special Project(ZDJ2009-01) ; Basic Science and Research Special Project(ZDJ2009-01) ; 40974021 ; 40974021 ; 40774044) ; 40774044) ; National Natural Science Foundation of China(41274059 ; National Natural Science Foundation of China(41274059 ; Basic Science and Research Special Project(ZDJ2009-01) ; Basic Science and Research Special Project(ZDJ2009-01) ; 40974021 ; 40974021 ; 40774044) ; 40774044) ; National Natural Science Foundation of China(41274059 ; National Natural Science Foundation of China(41274059 ; Basic Science and Research Special Project(ZDJ2009-01) ; Basic Science and Research Special Project(ZDJ2009-01) ; 40974021 ; 40974021 ; 40774044) ; 40774044)
源URL[http://ir.iggcas.ac.cn/handle/132A11/86256]  
专题中国科学院地质与地球物理研究所
通讯作者Lei, Jianshe
作者单位1.China Earthquake Adm, Inst Crustal Dynam, Key Lab Crustal Dynam, Beijing, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Lei, Jianshe,Li, Yuan,Xie, Furen,et al. Pn anisotropic tomography and dynamics under eastern Tibetan plateau[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2014,119(3):2174-2198.
APA Lei, Jianshe.,Li, Yuan.,Xie, Furen.,Teng, Jiwen.,Zhang, Guangwei.,...&Zha, Xiaohui.(2014).Pn anisotropic tomography and dynamics under eastern Tibetan plateau.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,119(3),2174-2198.
MLA Lei, Jianshe,et al."Pn anisotropic tomography and dynamics under eastern Tibetan plateau".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 119.3(2014):2174-2198.

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来源：地质与地球物理研究所

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