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P-wave tomographic images beneath southeastern Tibet: Investigating the mechanism of the 2008 Wenchuan earthquake

文献类型：期刊论文

作者Wei Wei1; Sun RuoMei2; Shi YaoLin1
刊名SCIENCE CHINA-EARTH SCIENCES
出版日期2010-09-01
卷号53期号:9页码:1252-1259
关键词Seismic Tomography Sichuan-yunnan Block Wenchuan Earthquake Longmenshan Fault Yangtze Craton
ISSN号1674-7313
DOI10.1007/s11430-010-4037-5
文献子类Article
英文摘要We used 71670 P-wave arrival times from 3594 earthquakes recorded by the Sichuan and Yunnan seismic networks to determine the three-dimensional P-wave velocity structure in the crust and uppermost mantle beneath the southeastern Tibetan Plateau. Our results show that prominent low P-wave velocity (low-Vp) anomalies exist in the mid- to lower crust of the Songpan-Ganze and Sichuan-Yunnan blocks. In contrast, a high P-wave velocity (high-Vp) anomaly is resolved in the middle and lower crust beneath the Sichuan Basin. Our tomographic results provide seismic evidence for a dynamic model of lower crustal flow. Ongoing lower crustal flow beneath the central and eastern Tibetan Plateau abuts against the mechanically strong Sichuan Basin resulting in accumulated strain in the Longmen Shan region. When a critical accumulation of strain energy was reached, its sudden release led to the occurrence of 2008 Wenchuan earthquake. Pronounced low-Vp anomalies are observed in the uppermost mantle in the region south of similar to 26A degrees N. Combining these results with shear-wave splitting investigations, we suggest that the flow of asthenospheric material has impacted the velocity structure of the uppermost mantle and caused the thinning of the southwestern Yangtze Craton.
WOS关键词LOWER CRUSTAL FLOW ; UPPER-MANTLE ; VELOCITY STRUCTURE ; EASTERN TIBET ; TECTONIC IMPLICATIONS ; M(S)8.0 EARTHQUAKE ; RECEIVER FUNCTIONS ; WESTERN SICHUAN ; FAULT ZONE ; CHINA
WOS研究方向Geology
语种英语
WOS记录号WOS:000281686200002
出版者SCIENCE PRESS
资助机构Chinese Academy of Sciences(KZCZ-YW-134) ; Chinese Academy of Sciences(KZCZ-YW-134) ; National Natural Science Foundation of China(90814014) ; National Natural Science Foundation of China(90814014) ; Chinese Academy of Sciences(KZCZ-YW-134) ; Chinese Academy of Sciences(KZCZ-YW-134) ; National Natural Science Foundation of China(90814014) ; National Natural Science Foundation of China(90814014) ; Chinese Academy of Sciences(KZCZ-YW-134) ; Chinese Academy of Sciences(KZCZ-YW-134) ; National Natural Science Foundation of China(90814014) ; National Natural Science Foundation of China(90814014) ; Chinese Academy of Sciences(KZCZ-YW-134) ; Chinese Academy of Sciences(KZCZ-YW-134) ; National Natural Science Foundation of China(90814014) ; National Natural Science Foundation of China(90814014)
源URL[http://ir.iggcas.ac.cn/handle/132A11/73356]  
专题中国科学院地质与地球物理研究所
通讯作者Wei Wei
作者单位1.Chinese Acad Sci, Grad Univ, Lab Computat Geodynam, Beijing 100049, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Wei Wei,Sun RuoMei,Shi YaoLin. P-wave tomographic images beneath southeastern Tibet: Investigating the mechanism of the 2008 Wenchuan earthquake[J]. SCIENCE CHINA-EARTH SCIENCES,2010,53(9):1252-1259.
APA Wei Wei,Sun RuoMei,&Shi YaoLin.(2010).P-wave tomographic images beneath southeastern Tibet: Investigating the mechanism of the 2008 Wenchuan earthquake.SCIENCE CHINA-EARTH SCIENCES,53(9),1252-1259.
MLA Wei Wei,et al."P-wave tomographic images beneath southeastern Tibet: Investigating the mechanism of the 2008 Wenchuan earthquake".SCIENCE CHINA-EARTH SCIENCES 53.9(2010):1252-1259.

入库方式： OAI收割

来源：地质与地球物理研究所

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