| Seismotectonic environment of occurring the February 3, 1996 Lijiang M=7.0 earthquake, Yunnan Province |
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| 作者姓名： | 韩竹军 虢顺民 向宏发 张家声 冉勇康 |
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| 作者单位： | Institute of Geology，China Earthquake Administration，Beijing 100029，China，Institute of Geology，China Earthquake Administration，Beijing 100029，China，Institute of Geology，China Earthquake Administration，Beijing 100029，China，Institute of Geology，China Earthquake Administration，Beijing 100029，China，Institute of Geology，China Earthquake Administration，Beijing 100029，China |
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| 基金项目： | Joint Seismological Science Foundation of China (198023) and National Natural Science Foundation (40272087). |
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| 摘 要： | Introduction The surface rupture and aftershocks of the February 3, 1996 Lijiang earthquake are basically distributed along the N-S-trending Lijiang-Daju fault, which is boundary fault between Lijiang Quaternary, fault controlled basin and Yulong-Haba range (ZHANG, et al, 1997). Corresponding to the surface geological features, the focal rupture of the Lijiang earthquake also shows large component of dip-slip. It is of great difference from that of other earthquakes in west Yunnan, in w…
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Seismotectonic environment of occurring the February 3, 1996 Lijiang M=7.0 earthquake, Yunnan Province |
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| HAN Zhu-jun GUO Shun-min XIANG Hong-fa ZHANG Jia-sheng RAN Yong-kangInstitute of Geology,China Earthquake Administration,Beijing ,China.Seismotectonic environment of occurring the February 3, 1996 Lijiang M=7.0 earthquake, Yunnan Province[J].Acta Seismologica Sinica(English Edition),2004,17(4). |
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| Authors: | HAN Zhu-jun GUO Shun-min XIANG Hong-fa ZHANG Jia-sheng RAN Yong-kangInstitute of Geology China Earthquake Administration Beijing China |
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| Institution: | HAN Zhu-jun GUO Shun-min XIANG Hong-fa ZHANG Jia-sheng RAN Yong-kangInstitute of Geology,China Earthquake Administration,Beijing 100029,China |
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| Abstract: | Lijiang-Daju fault, the seismogenic fault of the 1996 Lijiang M=7.0 earthquake, can be divided into Lijiang-Yuhu segment in the south and Yuhu-Daju segment in the north. The two segments show clear difference in geological tectonics, but have the similar dynamic features. Both normal dip-slip and sinistral strike-slip coexist on the fault plane. This kind of movement started at the beginning of the Quaternary (2.4~2.5 Ma B.P.). As to the tectonic types, the detachment fault with low angle was developed in the Early Pleistocene and the normal fault with high angle only after the Mid-Pleistocene (0.8 Ma B.P.). Based on the horizontal displacements of gullies and the vertical variance of planation surfaces cross the Lijiang-Daju fault at east piedmont of Yulong-Haba range, the average horizontal and vertical slip rates are calculated. They are 0.84 mm/a and 0.70 mm/a since the Quaternary and 1.56 mm/a and 1.69 mm/a since the Mid-Pleistocene. The movements of the nearly N-S-trending Lijiang-Daju fault are controlled not only by the regional stress field, but also by the variant movement between the Yulong-Haba range and Lijiang basin. The two kinds of dynamic processes form the characteristics of seismotectonic environment of occurring the 1996 Lijiang earthquake. |
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| Keywords: | the 1996 Lijiang earthquake variant movement basin boundary fault seismotectonic envi-ronment |
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