新疆哈密地区东盐池、七角井、托莱泉活动断裂微地貌及新活动特征  

MICRORELIEF AND NEW ACTIVITY FEATURES OF DONGYANCHI, QIJIAOJING AND TUOLAIQUAN ACTIVE FAULTS IN HAMI, XINJIANG

作　　者：罗福忠[1] 柏美祥[1] 张斌 尼亚孜.艾力木 李军[1] 

机构地区：[1]新疆维吾尔自治区地震局,新疆乌鲁木齐830011 [2]新疆哈密地区地震局,新疆哈密839000

出　　处：《内陆地震》2002年第1期40-47,共8页Inland Earthquake

基　　金：新疆地震科学基金资助 ( 990 2 )

摘　　要：大河沿—洛包泉活动断裂带由 7条活断裂呈左阶雁列式排列 ,其中东盐池、七角井、托莱泉活断裂在平面上也呈左阶排列。沿断裂分布有古地震断层陡坎。东盐池断裂具有左旋逆冲性质。断层陡坎高 0 .6— 4 .5 m,断坎坡角为 2 6°— 2 8°,断裂垂直断距 1m,冲沟左错 10— 11.5 m,其垂直平均活动速率为 0 .18mm / a,水平平均活动速率为 1.31— 2 .0 2 mm/ a,为全新世中、晚期活动断裂。七角井断裂具有左旋逆冲或左旋逆走滑性质 ,断层陡坎高为 0 .75— 8.3m ,断坎坡角为 14°— 2 1°,左错为2 .5— 6 .5 m,垂直平均活动速率为 0 .15— 0 .17mm/ a,水平平均活动速率为 0 .35— 0 .4 9mm/ a。该断裂为全新世中、晚期活动断裂。托莱泉断裂具有逆冲性质。断层陡坎西段高为 0 .75— 4 m,坡角为19°— 2 0 .5°;东段高为 3— 12 m,坡角为 10°— 2 9°,垂直平均活动速率为 0 .2 5 mm/ a。Daheyan-Luobaoquan fault zone consists of 7 active faults in left-lateral en echelon, and Dongyanchi, Qijiaojing, Tuolaiquan faults are 3 of them. Along these faults distribute paleoseismic fault scarps. The Dongyanchi is a left-lateral thrust fault. Its fault scarp is 0.6-4.5 m high, slope angle 26°-28°,the vertical faulting distance 1 m, the left dislocated distance of the gully 10-11.5 m, average vertical activity rate 0.18 mm/a, average horizontal activity rate 1.31-2.02 mm/a. The fault is a middle or late Holocene active one. The Qijiaojing fault is a left-lateral, thrust or left-lateral, reverse, strike-slip fault. Its fault scarp is 0.75-8.3 m high, slope angle 14°-21°,left dislocated distance of the gully 2.5-6.5 m, average vertical activity rate 0.15-0.17 mm/a, average horizontal activity rate 0.35-49 mm/a. The Qijiaojing fault is a middle or late Holocene active one. The Tuolaiquan fault has thrust character. The west segment of the fault scarp is 0.75-4 m high, slope angle 19°-20.5°; the east segment is 3-12 m high, slope angle 10°-29°; the average vertical activity rate is 0.25 mm/a. This fault is a Late Holocene active one.

关 键 词：新疆 哈密地区 东盐池 七角井 托莱泉 活动断裂 微地貌 新活动 

分 类 号：P542.3[天文地球—构造地质学] P315.2[天文地球—地质学]