1949年新疆库车7.4/级地震的地震构造条件

地震地质 ›› 2003, Vol. 25 ›› Issue (3): 450-459.

1949年新疆库车7.4/级地震的地震构造条件

徐杰¹, 周本刚¹, 杨晓平¹, 汪祥余², 周庆¹, 陈国光¹, 冉洪流¹, 刘占坡¹

1. 中国地震局地质研究所, 北京, 100029;
2. 中国石油天然气公司塔里木油田分公司, 库尔勒, 841000

收稿日期:2002-02-26 修回日期:2002-09-10 出版日期:2003-09-03 发布日期:2009-10-26
作者简介:徐杰,男,1943年生,1967年毕业于南京大学地质系大地构造专业,1986年在中国地震局地质研究所获博士学位,研究员,博士生导师,主要从事地震构造、新构造和盆地构造等研究,电话:010-62009154.
基金资助:
地震科学联合基金(198062)和科技部项日(951102)共同资助.

SEISMOTECTONIC SETTING OF THE 1949 KUQA, XINJIANG M7.4/EARTHQUAKE

XU Jie¹, ZHOU Ben-gang¹, YANG Xiao-ping¹, WANG Xiang-yu², ZHOU Qing¹, CHEN Guo-guang¹, RAN Hong-liu¹, LIU Zhan-po¹

1. Institute of Geology, China Seismological Bureau, Beijing 100029, China;
2. Tarim Oil Field Branch of China National Petroleum Company, Korla 841000, China

Received:2002-02-26 Revised:2002-09-10 Online:2003-09-03 Published:2009-10-26

摘要/Abstract

摘要： 前人研究认为,库车1949年7.4级地震主要与天山南麓活动构造带的NEE向秋立塔格断裂有关。最近笔者根据深地震地壳测深、石油地质及活断裂等研究的新成果,对这次地震的构造条件进行了较深入的分析。塔里木陆块向天山俯冲,天山上地壳被挤压块断隆升并侧向推覆扩展,于天山南缘形成库车盆地及由秋立塔格等一系列逆断裂组成的逆断-褶皱系,这是发育于沉积盖层的薄皮构造。NE向库车-依西1井断裂是库车盆地构造中重要的传递断裂,位于NE向的乌鲁木齐-库车-柯坪构造带中。有关7.4级地震的地震学研究结果与秋立塔格断裂完全不符,而与库车-依西1井断裂基本一致。

关键词: 陆内俯冲, 逆断-褶皱系, 薄皮构造, 新疆库车

Abstract: Previous studies suggested that the Kuqa, Xinjiang M7.4 earthquake of 1949 is associated with the NEE trending Qiulitage Fault of the active tectonic zone at the southern foot of the Tianshan Mountain. Recently we have made a more detailed analysis of the seismotectonic setting of this event based on new data and results of crustal seismic sounding, petroleum geology, and research of active faults. Our work indicates that the underthrusting of the Tarim block beneath the Tianshan, as well as faulted block uplift and lateral overthrusting and spreading of the upper crust of Tianshan have given rise to the development of the Kuqa basin and thrust-fold system along the southern margin of the Tianshan Mountain. All these are thin-skinned structures developed in the sedimentary cover. The NE-trending Kuqa-Yixi No.1 Well Fault is an important transfer fault in the Kuqa basin, which is located in the NE-trending Urumqi-Kuqa-Keping tectonic zone. The results of seismological research on the M7.4 earthquake indicate that the earthquake bears no relation to the Qiulitage Fault, but is related to the Kuqa-Yixi No.1 Well Fault.

Key words: intracontinental underthrust, thrust-fold system, thin-skinned structure, Kuqa, Xinjiang

中图分类号:

P315.2

徐杰, 周本刚, 杨晓平, 汪祥余, 周庆, 陈国光, 冉洪流, 刘占坡. 1949年新疆库车7.4/级地震的地震构造条件[J]. 地震地质, 2003, 25(3): 450-459.

XU Jie, ZHOU Ben-gang, YANG Xiao-ping, WANG Xiang-yu, ZHOU Qing, CHEN Guo-guang, RAN Hong-liu, LIU Zhan-po. SEISMOTECTONIC SETTING OF THE 1949 KUQA, XINJIANG M7.4/EARTHQUAKE[J]. SEISMOLOGY AND GEOLOGY, 2003, 25(3): 450-459.