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Seismotectonic environment of occurring the February 3, 1996 lijiang M=7.0 earthquake, Yunnan Province

Acta Seismologica Sinica(English Edition) 2004年第4期17卷 453-463页

作者： HAN Zhu-jun(韩竹军) GUO Shun-min(虢顺民) XIANG Hong-fa(向宏发) ZHANG Jia-sheng(张家声) RAN Yong-kang(冉勇康) 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

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.

关键词： the 1996 lijiang earthquake variant movement basin boundary fault seismotectonic envi-ronment

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