| 3-D velocity structure of P wave in the upper mantle beneath southwestern China and its adjacent areas |
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| 作者姓名： | 雷建设 周蕙兰 |
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| 作者单位： | University of Science and Technology of China |
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| 基金项目： | State Natural Science Foundation of China (49734150). |
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| 摘 要： | IntroductionSouthwestern China and its adjacent areas studied in the paper is the range of 10(N-36(N, 70(E-110(E, which includes southwestern areas of China (Sichuan, Xizang, Yunnan, Guizhou, Guangxi Provinces, southwestern Shaanxi Province and so on), India, Myanmar, Thailand, Vietnam, Laos and Cambodia countries and oceanic areas of Bay of Bengal and Beibu Gulf. The collision and extrusion of India plate and Eurasia plate makes the geological tectonic complex in this area (Figure 1…
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| 收稿时间： | 12 September 2001 |
| 修稿时间： | 19 December 2001 |
3-D velocity structure of P wave in the upper mantle beneath southwestern China and its adjacent areas |
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| Lei Jian-she,and Zhou Hui-lan.3-D velocity structure of P wave in the upper mantle beneath southwestern China and its adjacent areas[J].Acta Seismologica Sinica(English Edition),2002,15(2):134-142. |
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| Authors: | Lei Jian-she and Zhou Hui-lan |
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| Institution: | 1. Graduate School, University of Science and Technology of China, Beijing 100039, China
2. Graduate School, University of Science and Technology of China, Beijing 100039; China Graduate School, Chinese Academy of Sciences, Beijing 100039, China |
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| Abstract: | 3-D velocity structure of P wave in the upper mantle beneath southwestern China and its adjacent areas (10°N–36°N, 70°E–110°E)
down to the depth of 400 km has been studied by using 80 974 P-wave first arrival times recorded at 165 stations from 7 053
events both within the studying areas, selected from the ISC bulletin and the Bulletin of China and NEIC fundamental seismic
network. With a resolution of grid spacing of 2°×2°, the velocity heterogeneity on the horizontal profile is obvious though
it attenuates with the depth increasing. On the vertical profiles of velocity along the latitude of 16°N and 24°N, the collision
and extrusion of India plate to Eurasia plate is displayed, and a remarkable velocity difference between India plate and Eurasia
plate is shown. In the vertical profile along the longitude of 90°E, the subducting of India plate northward beneath Eurasia
plate (Tibet plateau) is also obvious. On the horizontal profile at the depth of 90 km, a slow velocity stripe from Myitkyina,
Myanmar to Donghai, Vietnam seems to be related to Honghe fault belt. An illustration method of describing the resolution
more directly and exactly has been proposed and utilized in this paper.
Foundation item: State Natural Science Foundation of China (49734150). |
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