天山南部北轮台断裂带东段晚第四纪活动特征

LATE QUATERNARY ACTIVITY CHARACTERISTICS OF EASTERN BEILUNTAI FAULT IN SOUTH OF THE TIANSHAN MOUNTAINS

利用卫星影像资料解译,通过野外实地考察并结合气象、地貌、时间的分析,对长逾300 km的北轮台断裂带的晚第四纪活动速率进行定量研究。北轮台断裂带西部为库车坳陷的北部控制性断裂带,东部为发育于山前冲洪积扇面上的断层陡坎,在阿克艾肯段断裂形成了高达38 m的断层陡坎,为多次7-7.5级地震活动的产物,其逆冲抬升速率可达到1.52 mm/a;而在吉格代布拉克段发育有高10-20 m的断层陡坎,此段断裂带的活动速率为0.1-0.9 mm/a。北轮台断裂东段自晚更新世以来活动明显,切割多级阶地面,形成不同高度的古地震形变带,估算最近一次古地震的离逝时间为1.7 ka。

The use of satellite imagery interpretation,through field investigation and analysis of meteorological features time to the Beiluntai fault length more than 300 km of Late Quaternary activity rate of quantitative research. Beiluntai fault is the northern control fault zone of west Kuche depression. The Fault scarp formed in the diluvial fan in the eastern part of Beiluntai fault,and in Akeaiken the fault formed up to 38 m high fault scarp,products for multiple 7 - 7. 5 earthquake activity,the thrust uplift rate can reach 1. 52 mm / a. The formation of 10 m - 20 m in Jigedaibulake ancient earthquake deformation zone,the fault activity rate is（ 0. 1 -0. 9） mm / a. The east of Beiluntai fault since the late Pleistocene activity obviously,cutting the multilevel stream terrace,and formate different height of the paleoearthquake deformation belt,an ancient earthquake recently estimated elapsed time for 1. 7 ka.