新疆伊犁喀什河断裂带及其活动性研究
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摘要
通过对 1812年新疆伊犁尼勒克地震的考察研究 ,认为该地震以地震断层为主体的地表地震形变带展布方向与发震断裂喀什河断裂带的走向一致。喀什河断裂带可分为 3段 ,全长 315 km,它是由多条断层组成的活动断裂带 ,总体以逆冲活动为主 ,东段具有右旋扭错性质。喀什河断裂带具有长期发育的历史 ,它控制了中生代地层的分布 ,在新生代仍有多次活动并以垂直运动为主 ,晚第四纪以来的垂直活动速率为 0 .9— 6 mm/ a。
Based on the field investigation of the Nileke earthquake occurred on Mar. 8, 1812, it is thought that the surface extension of the earthquake deformation zone accords with the strike of Kashi River fault (causative fault). The Kashi River fault zone is 315 km long, consists of many active faults, which can be divided into 3 parts of the west, middle and east segments. It is mainly characterized by thrust fault movement, and with right-lateral torsional dislocation in the east segment. The Kashi River fault zone has long development history. It controlled the distribution of the Mesozoic strata, had many times of activities in the Cenozoic, and lots of them were vertical motions. The vertical active rate has been 0.9 -6 mm/a since late Quaternary.
Based on the field investigation of the Nileke earthquake occurred on Mar. 8, 1812, it is thought that the surface extension of the earthquake deformation zone accords with the strike of Kashi River fault (causative fault). The Kashi River fault zone is 315 km long, consists of many active faults, which can be divided into 3 parts of the west, middle and east segments. It is mainly characterized by thrust fault movement, and with right-lateral torsional dislocation in the east segment. The Kashi River fault zone has long development history. It controlled the distribution of the Mesozoic strata, had many times of activities in the Cenozoic, and lots of them were vertical motions. The vertical active rate has been 0.9 -6 mm/a since late Quaternary.
引文
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[4]杨章,陈祥玉,尹光华,等.1812年3月8日新疆尼勒克8级大震[J].西北地震学报,1985,7(1):59—65.
[5]杨章,张勇,李军,等.对1812年3月8日新疆尼勒克8级地震发震构造初探[J].地震学报,1985,7(4):434—444
[6]尹光华.新疆伊犁盆地新构造运动与地震[J].内陆地震,1993,7(2):180—187.
[7]WallaceR E.Profiles andAges ofYoungFaultScarps,North- centralNevada[J].GeologicalSociety ofAm ericaBul-letin,1977,88(9):1267—1281.
[8]BucknamR C,AndersonR E.Estimation of fault- scarp ages from a scarp- height slope- angle relationship.Geology,1979,(7):11—14.
[9]朱海之.我国黄土地区地震崩滑灾害的研究[A].见:国家地震局地质研究所编.现代地壳运动研究[C].北京:地震出版社,1987.165—175.
[10]尹光华,买颜东,蒋伯军,等.新疆独山子GPS形变测量与断层活动性研究[J].内陆地震,1999,13(4):345—351.
[11]尹光华,李军,张勇,等.尼勒克地震滑坡的统计分析及初步研究[J].内陆地震,2001,15(1):56—63.
[12]冯先岳.新疆尼勒克地震断层带[J].内陆地震,1990,4(3):273—277.
[13]冯先岳.新疆古地震[M].乌鲁木齐:新疆科技卫生出版社,1997.
[14]杨晓平,沈军.天山内部博罗可努断裂精河—阿拉山口段晚更新世以来的活动特征[J].地震地质,2000,22(3):305—315.
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