关键词: 走滑断裂, 博阿断裂, 应变分配, 活动构造, 地震形变带, 天山

Abstract: The Bolokenu-Aqikekuduke Fault extends over 700km and obliquely cuts the North Tian Shan. The fault is quantitatively studied in this paper based on remote sensing data, field observation, and the analyses of the relationship between the morphology and the climate change. The fault is composed of two portions, the NW-striking western portion and the NWW-striking eastern portion. The western portion is right lateral strike-slip with a rate of 5mm/a, having a length of about 250km and extending northwestward into the Kazakhstan. Along the fault 3～4 rupture zones produced by Paleoearthquakes or historic earthquakes were found. It has the potential for generating strong earthquakes of Magnitude around 7.5. The NWW-striking fault of east portions is dominated by right lateral slip with a rate of 1～1.4mm/a. Relatively small rupture zones, no more than 10km long, were found along this fault. It has the potential for generating strong earthquake of magnitude around 7. The western section of the Bolokenu Aqikekuduke Fault is one of the major NW-striking right lateral strike-slip faults in central Asia, and it is the result of the regional clockwise shearing. It accommodates the different deformations between western and eastern Tianshan and transforms the tectonic deformation among different compressive area. The NWW-striking fault of eastern section was developed from the NWW-striking suture zone in Northern Tianshan. It is accompanied by the E-W-striking thrust system in the front of the mountains and makes up a typical strain partitioning style of the oblique compressive belt. The strain in the oblique compressive belt is partitioned into pediment thrust belt and intermontane strike-slip fault. They transform the deformation laterally along the mountains and directly toward the foreland basin.

Key words: strike-slip fault, Bolokenu-Aqikekuduke Fault, strain partitioning, earthquake deformation zone, active fault, Tian Shan