The Dzhungarian fault: Late Quaternary tectonics and slip rate of a major right-lateral strike-slip fault in the northern Tien Shan region
The Dzhungarian fault: Late Quaternary tectonics and slip rate of a major right-lateral strike-slip fault in the northern Tien Shan region
复制标题
准噶尔断层：北天山地区一条主要右旋走滑断层的晚第四纪构造和滑动速率
DOI：
10.1002/jgrb.50367
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发表时间：
2013
期刊：
影响因子：
3.4
通讯作者：
Campbell G
中科院分区：
文献类型：
--
作者：
Campbell G
中亚的准噶尔走滑断层是一系列长的、北西-南东右旋走滑断层之一，是北方天山地区的特征，从高山延伸到哈萨克地台超过300公里。我们的实地和卫星观测表明，根据走向的变化，准噶尔断层可以分为三个100公里长的部分。通过对错断河流和冲积扇的形态分析，以及光释光测年，我们发现准噶尔断层的最小平均晚第四纪滑动速率为2.2 ± 0.8 mm/年，并容纳了与印度-欧亚大陆碰撞有关的南北缩短。这种缩短也可以部分地通过围绕垂直轴逆时针旋转来调节。可能的古地震破裂的证据表明，至少Mw 7的地震可以与长达30 km的断层中央部分的逆滑动部分相关联。一个破坏准噶尔断层较长部分的事件有可能产生更大震级的地震（Mw 8）;然而，长时间（例如，数千年），以积累足够的应变，以产生这样的地震。
The Dzhungarian strike‐slip fault of Central Asia is one of a series of long, NW‐SE right‐lateral strike‐slip faults that are characteristic of the northern Tien Shan region and extends over 300 km from the high mountains into the Kazakh Platform. Our field‐based and satellite observations reveal that the Dzhungarian fault can be characterized by three 100 km long sections based on variation in strike direction. Through morphological analysis of offset streams and alluvial fans, and through optically stimulated luminescence dating, we find that the Dzhungarian fault has a minimum average late Quaternary slip rate of 2.2 ± 0.8 mm/yr and accommodates N‐S shortening related to the India‐Eurasia collision. This shortening may also be partly accommodated by counterclockwise rotation about a vertical axis. Evidence for a possible paleo‐earthquake rupture indicates that earthquakes up to at leastMw7 can be associated with just the partitioned component of reverse slip on segments of the central section of the fault up to 30 km long. An event rupturing longer sections of the Dzhungarian fault has the potential to generate greater magnitude earthquakes (Mw8); however, long time periods (e.g., thousands of years) are expected in order to accumulate enough strain to generate such earthquakes.