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????1999-2007??GPS???????????????????????????????棬??????????????????????????????-????????????μ????????????????????????????????????????????????????????漷?????????????????????????????????????????-?????????е?????α?????????????????????????壩????????????5 mm/a??????????????????们????????????????????2.4 mm/a?????????伷???????????????????????????α??β?????????-????????????????????????????漷?-???-????????????????

PRESENT-DAY TECTONIC DEFORMATION CHARACTERISTICS OF HAIYUAN-LIUPANSHAN FAULT ZONE

On the basis of the GPS horizontal velocity field data in the period of 1999-2007, using the block model and GPS velocity profiles across faults and combining with the distribution of the strain rate field near it.we analyzed the present-day tectonic deformation characteristics of the Haiyuan liupanshan fault zone from its segments and the entirety.The results show that the characteristics of the Tuolaishan fault and the Lenglongling fault is strike-slip with compression; The deformation of the Jinqianghe fault is the most distinct, and its shear strain accumulation is the highest. The strain accumulation on the Maomaoshan segment is larger than that of the Laohushan segment.The left slip rate of the special Haiyuan fault is 5 mm/a, and this fault is still creeping and adjusting since the Haiyuan earthquake occurrence. The compressive velocity across northern segment of the liupanshan fault is 2.4 mm/a, whose compressive strain accumulation is obvious. However the deformation of middle and south segment of the liupanshan fault is not distinct. The strike slip with compression strike slip compression transformation pattern presentes themselevs in the entire fault system from west to east.