| Seismic tomography of Yunnan region using short-period surface wave phase velocity |
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| 作者姓名： | 何正勤 苏伟 叶太兰 |
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| 作者单位： | Institute of Geophysics，China Earthquake Administration，Beijing 100081，China，Institute of Geophysics，China Earthquake Administration，Beijing 100081，China，Institute of Geophysics，China Earthquake Administration，Beijing 100081，China |
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| 基金项目： | Joint Seismological Science Foundation of China (101086) and the key project Digital Crustal and Mantle Structure of Chinese Mainland from China Earthquake Administration. |
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| 摘 要： | Introduction The Yunnan region is located on the east margin of the collision zone between the Indian and Eurasian plates; it belongs to the south section of the N-S Seismic Belt of China and is the junc-ture of the Yangtze metaplatform, Songpan-Garz?fold system, Sanjiang fold system and South China fold system. This region has complex tectonic movements, crisscross faults and frequently occurring strong earthquakes, and hence it is one of the regions with the strongest earthquake ac-tivi…
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| 收稿时间： | 24 November 2003 |
| 修稿时间： | 12 April 2004 |
Seismic tomography of Yunnan region using short-period surface wave phase velocity |
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| He Zheng-qin , Su Wei and Ye Tai-lan.Seismic tomography of Yunnan region using short-period surface wave phase velocity[J].Acta Seismologica Sinica(English Edition),2004,17(6):642-650. |
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| Authors: | He Zheng-qin Su Wei and Ye Tai-lan |
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| Institution: | Institute of Geophysics, China Earthquake Administration, Beijing 100081, China |
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| Abstract: | The data of short-period (1~18 s) surface waves recorded by 23 stations belonging to the digital seismic network of Yunnan Province of China are used in this paper. From these data, the dispersion curves of phase velocities of the fundamental mode Rayleigh wave along 209 paths are determined by using the two-station narrowband filtering cross-correlation method. Adopting tomography method, the distribution maps of phase velocities at various peri-ods in Yunnan region are inverted. The maps of phase velocities on profiles along 24N, 25N, 26N, 27N and 100.5E and the distribution maps of phase velocities at 3 periods in the study region are given. The results show that the phase velocity distribution in Yunnan region has strong variations in horizontal direction, and the phase velocity distribution in short-period range is closely related to the thickness of sedimentary layers in the shallow crust. The phase velocity in southern part of the Sichuan-Yunnan rhombic block encircled by the Honghe fault and Xiaojiang fault is obviously lower than that in surrounding areas. The epicentral locations of strong earthquakes in Yunnan region are mainly distributed in transitional zones between low and high phase velocities. |
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| Keywords: | Yunnan region phase velocity of Rayleigh waves tomography middle and upper crust velocity structure |
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