【摘要】 为了解阜康断裂晚第四纪以来的活动特征,准确评价该断裂的大震危险性,在野外地震地质调查的基础上,对变形的微地貌进行了测量,开挖了2个大型古地震探槽,并采集了系列释光年龄样品,对阜康断裂甘河子段进行了细致研究.甘河子断裂段是一条全新世活动断裂,全长约33km,构成博格达北麓与山前冲洪积扇的界线.该断裂晚第四纪期间活动性较强,运动方式以向盆地方向的逆冲为主,形成了一系列地质地貌现象.晚第四纪晚期以来,断裂的平均垂直滑动速率在0.34～0.43mm/a.全新世中期以来,断裂有过2次古地震事件,断裂大震(特征地震)的复发周期为2100～3750a,最新一次古地震事件造成的地表垂直位移量为1.5m左右,对应的古地震震级在7.2～7.4之间,该次古地震事件离逝时间已达4.11ka,目前该断裂已经累积了较高能量.更多还原

【Abstract】 In order to understand the activity characteristics of the Fukang fault in Late-Quaternary,and accurately estimate the seismic hazard of the fault,a geological survey has been conducted along the Fukang fault.By surveying the deformation micro-topography,excavating two large paleoearthquake trenches,and dating a series of samples of thermoluminescence,the quantity activity characteristics of the Ganhezi fault segment of the Fukang fault belt are revealed.The Ganhezi fault segment is a Holocene active fault,with a total length about 33 km.The fault activity is obvious,generating a series of apparent geomorphic traces on the surface.Since the Late-Quaternary,the average vertical slip rate of fault is about 0.34-0.43 mm/a.Since the Mid-Holocene,there were two paleoearthquake events;the strong earthquake recurrence period of the fualt segment is about 2 100-3 750 a.The vertical surface displacement is about 1.5 m and the elapsed time is 4.11 ka of the latest paleoearthquake,corresponding to the paleoearthquake magnitude of between Ms7.2-7.4.The fault has accumulated a high energy so far.更多还原