| Three-dimensional seismic velocity tomography of the upper crust in Tengchong volcanic area, Yunnan Province |
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| 作者姓名： | 楼海 王椿镛 皇甫岗 秦嘉政 |
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| 作者单位： | LOU Hai1) WANG Chun-yong1) HUANGFU Gang2) QIN Jia-zheng2) 1) Institute of Geophysics，China Seismological Bureau，Beijing 100081，China 2) Seismological Bureau of Yunnan Province，Kunming 650041，China |
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| 基金项目： | State Natural Science Foundation of China (D49974020), Joint Seismological Science Foundation of China (199110) and Project (95-11-01-06) during Ninth Five-Year Plan from China Seismological Bureau. |
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| 摘 要： | Introduction Tengchong is one of youngest volcanic areas in Chinese mainland. Since Pliocene, the volcanoes have erupted several times. Nowadays, the thermal activity is very intensive there. The possibility of re-eruption and the reserve of geothermal energy in the area are the questions to which the publics pay much attention, and the volcanists and seismologists dedicated. HAN, et al (1996) reviewed all of the studies carried out in Tengchong area. In the late 1990s, an integrative volca…
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| 收稿时间： | 25 September 2001 |
| 修稿时间： | 30 January 2002 |
Three-dimensional seismic velocity tomography of the upper crust in Tengchong volcanic area, Yunnan Province |
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| Lou Hai, Wang Chun-yong, Huangfu Gang and Qin Jia-zheng.Three-dimensional seismic velocity tomography of the upper crust in Tengchong volcanic area, Yunnan Province[J].Acta Seismologica Sinica(English Edition),2002,15(3):260-268. |
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| Authors: | Lou Hai Wang Chun-yong Huangfu Gang and Qin Jia-zheng |
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| Institution: | 1. Institute of Geophysics, China Seismological Bureau, Beijing 100081, China
2. Seismological Bureau of Yunnan Province, Kunming 650041, China |
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| Abstract: | Based on data collected by deep seismic sounding carried out in 1999, a three-dimensional P wave velocity structure is determined with tomographic inversion. The tomographic result shows that there is a P wave low velocity zone (LVZ) in the upper crust beneath the Tengchong volcanic area. The LVZ is in the depth of 7~8 km and may be a smgma chamber or a partial melting body. The result also shows that the LVZ is in the northeastern side of the Rehai hydrothermal field, which is located in another LVZ near the surface. The shallow LVZ may represent a well-developed fracture zone. The strong hydrothermal activity in Rehai area can attribute to the existence of fractures between two LVZs. These fractures are the channels for going upwards of the deep hot fluid. |
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| Keywords: | Tengchong volcanic area three-dimensional seismic tomography magma chamber |
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