| Travel time tomography inversion and the deep structure of the southern Tibet |
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| 引用本文： | 吕庆田,姜枚,ＫＡＩ－ＹＩＭＡ,Ａ．Ｈｉｒｎ,Ａ．Ｎｅｒｃｅｓｉａｎ. Travel time tomography inversion and the deep structure of the southern Tibet[J]. 地震学报(英文版), 1996, 9(4): 583-592. DOI: 10.1007/BF02651048 |
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| 作者姓名： | 吕庆田 姜枚 ＫＡＩ－ＹＩＭＡ Ａ．Ｈｉｒｎ Ａ．Ｎｅｒｃｅｓｉａｎ |
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| 作者单位： | QING TIAN L 1),MEI JIANG 1),KAI YI MA 1),A.Hirn 2) and A.Nercessian 2) 1) Institute of Mineral Deposits,Chinese Academy of Geological Sciences,Beijing 100037,China 2) Seismological Department,Institute de Ph |
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| 摘 要： | ＴｒａｖｅｌｔｉｍｅｔｏｍｏｇｒａｐｈｙｉｎｖｅｒｓｉｏｎａｎｄｔｈｅｄｅｅｐｓｔｒｕｃｔｕｒｅｏｆｔｈｅｓｏｕｔｈｅｒｎＴｉｂｅｔＱＩＮＧ－ＴＩＡＮＬＵ１）（吕庆田）,ＭＥＩ－ＪＩＡＮＧ１）（姜枚）,ＫＡＩ－ＹＩＭＡ１）（马开义）,Ａ．Ｈｉｒｎ２...
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| 收稿时间： | 1995-03-06 |
| 修稿时间： | 1995-11-02 |
Travel time tomography inversion and the deep structure of the southern Tibet |
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| QING TIAN L ),MEI JIANG ),KAI YI MA ),A.Hirn ) and A.Nercessian ) ) Institute of Mineral Deposits,Chinese Academy of Geological Sciences,Beijing ,China ) Seismological Department,Institute de Ph. Travel time tomography inversion and the deep structure of the southern Tibet[J]. Acta Seismologica Sinica(English Edition), 1996, 9(4): 583-592. DOI: 10.1007/BF02651048 |
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| Authors: | QING TIAN L ) MEI JIANG ) KAI YI MA ) A.Hirn ) A.Nercessian ) ) Institute of Mineral Deposits Chinese Academy of Geological Sciences Beijing China ) Seismological Department Institute de Ph |
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| Affiliation: | (1) Institute of Mineral Deposits, Chinese Academy of Geological Sciences, 100037 Beijing, China;(2) Seismological Department, Institut de Physique de Globe de Paris, 4 Place Jussieu, 75252 Paris, France |
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| Abstract: | 2312 P and some S arrival times were picked from 80 earthquakes recorded by 51 seismographs deployed on a profile that followed the southern Tibetan highway during 1992 Sino-French seismic experiment. We analysed the azimuthal and distance variations of P, PKP residuals and S-P travel time residuals along the profile and their tectonic implication, and finally, we applied the "ACH" inversion scheme to calculate the velocity perturbation in the crust and upper mantle. The initial results from our study are: (1) the upper mantle velocity beneath Tibetan Plateau is lower than that of normal continents, the lowest mantle velocity is found beneath QiangTang block. The early PKP residuals in the north (north to Sangxiong) of the profile indicates a shallower Moho depth. (2) The abrupt increase of S-P travel time residuals northward from Indus-Tsangpo Suture (ITS) and the low velocity crust feature in this area from tomography inversion evidenced the existence of partial melting within the crust. (3) Karakorum Jiali Fault Zones (KJFZ) may be the southern branch of Banggong-Nujiang Suture (BNS), the southern boundary of Qiangtang block. (4) The high velocity anomaly beneath north Himalaya revealed by tomography inversion may represents the the front of the underthrusting Indian lithosphere. The lower velocity anomaly beneath the center of the profile may reflect the physical state change related to high temperature. |
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| Keywords: | residual seismic tomography the Tibetan Plateau upper mantle. |
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