新疆鄯善碱泉子—巴里坤洛包泉活动断裂带研究

STUDY ON JIANQUANZI—LUOBAOQUAN ACTIVE FAULT ZONE IN XINJIANG

通过对碱泉子—洛包泉活动断裂带中碱泉子、红山口及洛包泉3 条活断层断坎微地貌的实测,尤其是对洛包泉活断层地衣直径及醉汉林胸径的实测,认为碱泉子活断层中全新世以来的垂直活动速率为0.99±0.02 m m /a～1.85±0.03 m m /a;红山口左旋正断层构成顺坡向断层陡坎,坎高1.6～7.0 m ,中全新世以来垂直活动速率为0.26±0.02 m m /a～0.95±0.06 m m /a,按其形成的水系左错1.6～2.8 m 计算,其水平活动速率为0.22±0.01 m m /a～0.38±0.03 m m /a,红山口活断层滑动速率为0.35～1.02 m m /a;洛包泉活断层地表破裂带长13 km ,断坎高3.6～14.8 m ,是由1914 年8 月5 日发生的7 12 级地震造成的。

Through surveying 3 active fault scarps on Jianquanzi-Luobaoquan active fault zone,respectively in Jianquanzi,Hongshankou and Luobaoquan,especially measuring the diameter of lichen and the bust of drunkard forest on Luobaoquan active fault,it is considered that the vertically active rate of the Jianquanzi thrust has been 0.99±0.02～1.85±0.03 mm/a since Middle Holocene.Hongshankou left lateral normal fault formed a consequent scarp high 1.6～7.0 m, its vertically active rate has been 0.26±0.02~0.95±0.06 mm/a since Middle Holocene.According to the left faulted amount of the river system(1.6~2.8 m),its horizontally active rate is 0.22±0.01~0.38±0.03 mm/a.The slip rate of Hongshankou Fault is 0.35~1.02 mm/a.The surface rupture zone of Luobaoquan active fault is as long as 13 km and the fault scarp is 3.6~14.8 m in height,which was caused by the earthquake with M712 on Aug.5,1914.