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卡兹克阿尔特断裂带是帕米尔和天山新生代造山带间一个重要的活动构造边界 ,通过对其活动构造特征的详细地质调查和大比例尺填图 ,可将卡兹克阿尔特断裂带进一步划分为吉勒格由特断裂带、乌恰地震断裂带和木什断裂带 3段。吉勒格由特断裂带的地表破裂为一系列的断层陡坎和偏转的冲积扇 ,经过别尔托阔依河出山口处时 ,切割了T1至T3堆积阶地。断裂带在T1、T2 和T3阶地的断层陡坎高度分别为 0 67m、3 90m和 36 5 0m。对采自T2 阶地顶部和底部的粉砂样品进行光释光测年 ,测定的初步结果分别为 890 0aBP和 10 5 0 0aBP ,因此对T3、T2 阶地以来的滑动速率估计分别约为 3 5mm a、0 8mm a。断裂的前缘开挖的探槽揭示出全新世以来有 4次古地震活动。乌恰地震带主要切割克兹勒苏河的T3阶地后缘 ,沿断裂带分布有大小不等的断塞塘和断层陡坎。 1985年 8月 2 3日在乌恰地震带上发生MS7.4地震 ,地震最大位错为1 5m。根据断层陡坎计算出断裂的滑动速率约为 0 5 4mm a。卡帕河的东岸探槽同样揭示出有4次古地震活动。在乌恰地震带的东端 ,木什断裂带地表长度约 6km ,由数十条左阶排列的反向断层陡坎 (坡向北 )组成 ,沿这些断坎多处可见冲沟被断错 ,横跨断层陡坎的探槽揭示出 3次古地震活动。
The Katz-Alte fault zone is an important tectonic boundary between the Pamir and Tianshan orogenic belts. Detailed geological surveys and large-scale mapping of tectonic features of its activities can further extend the Katz-Alt fault zone Divided into Ji Lege Youte fault zone, Wuqia earthquake fault zone and Mushishu fault zone 3. Ji Lege by the special fault rupture of the surface rupture of a series of fault scarp and deflection of the alluvial fan, through the Bertuco River outlet, cut T1 to T3 accumulation terrace. The height of faults in the fault zones at T1, T2 and T3 are 0 67m, 3 90m and 36 50m, respectively. Photoluminescence dating of silt samples collected from the top and bottom of T2 terrace were 890 0 aBP and 105 000 a BP, respectively. Therefore, the sliding velocities of T3 and T2 terraces were estimated to be about 3 5 mm a , 0 8mm a. The trenches of the fractured leading edge reveal four paleoseismic activities since the Holocene. The Wuqia seismic zone mainly cleaves the T3 terrace of the Kzeltsu River. There are fault pockets and fault banks with different sizes distributed along the fault zone. The MS7.4 earthquake occurred on August 2, 1985 in the Wuqia seismic zone with the maximum dislocation of 15 m. According to the fault hurdle calculated fracture rate of sliding is about 0 5 4mm a. The east bank of the Kapa River also reveals four paleoseismic activities. At the eastern end of the Wuqia seismic belt, the Mushizi fault has a surface length of about 6km and is composed of dozens of reverse fault scarps (north to slope) arranged on the left-hand side. , Trenches across the fault scarp reveal three paleoearthquakes.