新疆阿克苏大石峡水电站附近活动断层的基本特征

THE BASIC CHARACTERISTIC OF ACTIVE FAULT NEAR BIG SHIXIA HYDROELECTRIC INSTALLATION OF XINJIANG AKESU

通过对大石峡水电站附近的多条活动断层研究表明:库车坳陷西段的乌什坳陷区内,主要发育有两排新隆起的活动褶皱,由北向南依次为沙依拉木背斜带和苏尔滚背斜带;区内的活动断层主要以NE向为主,其中较大的断层有阔克沙勒断层、迈丹—沙依拉木断层和库齐隐伏断层。研究区中对场地影响较大的断层为迈丹—沙依拉木断层和大石峡口山前断层,它们均表现为东西分段特性,断层整体活动程度西强东弱。库齐隐伏断层是一条晚更新世末期的活动断层,最新的活动时代为距今1.4万年左右。

By studying many active faults near big Shixia hydroelectric installation, we though that Wushi sunken area in west of Kuche develops mainly active pleat which two rows new upheaval. From north to south, it is in turn Samula and Suergun anticline zones. The active fault in the area is mainly by NE. In them, the bigger faults are the Kuokeshale fault, Maidan-Shayilamu fault and Kuqi underlying fault. In the research area, the bigger fault which influenced for site is Maidan-Shayilamu fault and the fault in front of mountain near big Shixia. They both display the partition characteristic from east to west. The whole active intensity of faults shows that the west is strong while the east is weak. It is consistent with the result which the predecessor got. That is, they thought that the whole active of Tianshan mountain structures is weak gradually from west to east. Kuqi underlying fault is a late epipleistocene last stage active fault. And the newest active time was about 14,000 years apart from now.