| 3-D velocity images of the crust and upper mantle of the Tianshan area |
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| 作者姓名： | 胥颐 朱介寿 刘志坚 张华卿 朱燕 |
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| 作者单位： | Yi XU ; Jie-Shou ZHU ; Zhi-Jian LIU; Hua-Qing ZHANG and Yan ZHU(Seismological Bureau of Xinjiang Uygur Autonomous Region，Urumqi 830011，China)(Chengdu Institute of Technology，Chengdu 610000，China) |
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| 摘 要： | （胥颐，朱介寿，刘志坚，张华卿，朱燕）３－ＤｖｅｌｏｃｉｔｙｉｍａｇｅｓｏｆｔｈｅｃｒｕｓｔａｎｄｕｐｐｅｒｍａｎｔｌｅｏｆｔｈｅＴｉａｎｓｈａｎａｒｅａ￥ＹｉＸＵ；Ｊｉｅ－ＳｈｏｕＺＨＵ；Ｚｈｉ－ＪｉａｎＬＩＵ；Ｈｕａ－ＱｉｎｇＺＨＡＮＧａｎｄＹａ...
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| 收稿时间： | 26 June 1993 |
| 修稿时间： | 27 March 1994 |
3-D velocity images of the crust and upper mantle of the Tianshan area |
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| Yi XU , Jie-Shou ZHU , Zhi-Jian LIU, Hua-Qing ZHANG and Yan ZHU.3-D velocity images of the crust and upper mantle of the Tianshan area[J].Acta Seismologica Sinica(English Edition),1994,7(4):595-602. |
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| Authors: | Yi XU Jie-Shou ZHU Zhi-Jian LIU Hua-Qing ZHANG and Yan ZHU |
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| Institution: | (1) Seismological Bureau of Xinjiang Uygur Autonomous Region, 830011 ürümqi, China;(2) Chengdu Institute of Technology, 610000 Chengdu, China |
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| Abstract: | D velocity images of the crust and upper mantle in the Tianshan are established by means of seismic tomograghy. From the results, some understanding can be achieved as follows: (1) The northern and central parts of the Tianshan are the uplifted areas with high velocities. The low velocity areas in front of the northern and southern flanks of the Tianshan are formed by the southern margin of the Junggar Basin, Turpan Basin, Kuqa depression, Kalpin fault block and Kaxgar depression. The Ili Basin and the western Kunlun appear as intracrustal stable high velocity blocks, while the Bachu uplift extends down to the crustal bottom. Along the main peaks of the Tianshan and Mt. Kongur of the western Kunlun, the Moho depresses on a great scale to form five large low velocity areas. (2) In the northern Tianshan snd western Junggar Basin, the lithosphere is thicker and features a high velocity probably with an asthenolith layer existing on the top of the upper mantle. In the southern Tianshan, the feature of the lithosphere is not very clear, and the existence of a comic low velocity block between 120-280 km depth in the Kaxgar area is presumably related with the upwelling of astenolith from the upper mantle. (3) Some relation does exist between velocity structures and seismic activities, especially those gradient belts between the low velocity zone in the upper crust and the low velocity zone in the lower crust may be the tectonic positions for the preparation of moderate-strong earthquakes. (4) Seismically active areas on the northern and southern flanks of the Tianshan are locations with most inhomogeneous crustal media and welldeveloped deep faults. Fractures or interlayer-gliding are very likely to occur under the action of tectonic forces and thus to induce earthquakes in these areas. |
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| Keywords: | Tianshan area seismic tomograghy velocity images inhomogeneity |
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