摘要
阜康-吉木萨尔断层是博格达山体与山前冲洪积平原的分界断层,全新世以来仍在活动,山前的冲洪积平原和河流低级阶地均发生了不同程度的拱曲变形,断层剖面揭示了该断层晚更新世末期有3次古地震事件。断层近地表后倾角变缓,地表的陡坎地形主要是由地层的拱曲变形形成的,反映了断层近地表位错的消减和分配规律。
The Fukang-Jimsar fault, a Holocene active fault, is considered as a borderline fault between Bogeda Mountain and piedmont alluvial-pluvial fans. Piedmont alluvial-pluvial fans and low terraces of rivers were bended in different degrees since the middle and late Holocene. The fault cross-section near Dalongkou indicates there were three paleoseismic events during late Pleistocene, and the recurrence interval of earthquake on the east segment of the fault is 4500 -7500 a. The obliquity of the Fukang-Jimsar fault inclination decreased when it reached the ground, and scarps on the surface were formed by the bending strata. The section reveals the ways of displacemental diminishment and deformation distribution near the ground.
出处
《西北地震学报》
CSCD
北大核心
2005年第1期47-51,70,共6页
Northwestern Seismological Journal
基金
国家自然科学基金(40262002)
地震科学联合基金(103008
103056)
新疆科技攻关项目(20033316)共同资助.
关键词
天山
博格达山
阜康—吉木萨尔断层
晚第四纪
变形
Tianshan mountain
Bogeda mountain
The Fukang- Jimsar fault
Late Quaternary
Defromation
