Crust-upper mantle seismic velocity structure across Southeastern China
文献类型：期刊论文
| 作者 | Zhang, ZJ; Badal, J; Li, YK; Chen, Y; Yang, LQ; Teng, JW |
| 刊名 | TECTONOPHYSICS
 |
| 出版日期 | 2005-01-06 |
| 卷号 | 395期号:1-2页码:137-157 |
| 关键词 | Wide-angle Seismic Reflection/refraction P- And S-wave Velocity Models Crustal Structure Yanetze And Cathaysia Blocks Southeastern China |
| ISSN号 | 0040-1951 |
| 文献子类 | Article |
| 英文摘要 | One in-line wide-angle seismic profile was conducted in 1990 in the course of the southeastern China Continental Dynamics project aimed at the study of the contact between the Cathaysia block and the Yangtze block. This 380-km-long profile extended in NW-SE direction from Tunxi, Anhui Province, to Wenzhou, Zhejiang Province. Five in-line shots were fired and recorded at seismic stations with spacing of about 3 km along the recording line. We have used two-dimensional ray tracing to model P- and S-wave arrivals and provide constraints on the velocity structure of the upper crust, middle crust, lower crust. Moho discontinuity, and the top part of the lithospheric mantle. P-wave velocity, S-wave velocity and V-p/V-s ratio are mapped. The crust is 36-km thick on average, albeit it gradually thins from the northwest end to the southeast end (offshore) of the profile. The average crustal velocity is 6.26 km/s for P-waves but 3.6 km/s for S-waves. A relatively narrow low-velocity layer of about 4 kin of thickness, with P- and S-wave velocities of 6.2 km/s and 3.5 km/s. respectively, marks the bottom of the middle crust at a depth of 23-km northwest and 17-km southeast. At the crust-mantle transition. the P- and S-wave velocity change quickly from 7.4 to 7.8 km/s (northwest) and 8.0 to 8.2 km/s (southeast) and from 3.9 to 4.2 km/s (northwest) and 3.9 to 4-5 km/s (southeast), respectively. This result implies a lateral contrast in the upper mantle velocity along the 140 km sampled by the profile approximately. The average V-p/V-s ratio ranges from 1.68-1.8 for the upper crust to 1.75 for the middle and 1.75-1.85 for lower crust. With the interpretation of the wide-angle seismic dam Jianashan-Shaoxin fault is considered as the boundary between the Yangtze and the Cathaysia block. (C) 2004 Elsevier B.V. All rights reserved. |
| WOS关键词 | SOUTH CHINA ; TECTONIC IMPLICATIONS ; EVOLUTION |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000226409500008 |
| 出版者 | ELSEVIER SCIENCE BV |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/64798]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Zhang, ZJ |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Univ Zaragoza, E-50009 Zaragoza, Spain 3.Minist Land & Resources, Geol Data Ctr, Hebei 110101, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, ZJ,Badal, J,Li, YK,et al. Crust-upper mantle seismic velocity structure across Southeastern China[J]. TECTONOPHYSICS,2005,395(1-2):137-157. |
| APA | Zhang, ZJ,Badal, J,Li, YK,Chen, Y,Yang, LQ,&Teng, JW.(2005).Crust-upper mantle seismic velocity structure across Southeastern China.TECTONOPHYSICS,395(1-2),137-157. |
| MLA | Zhang, ZJ,et al."Crust-upper mantle seismic velocity structure across Southeastern China".TECTONOPHYSICS 395.1-2(2005):137-157. |
入库方式： OAI收割
来源：地质与地球物理研究所
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