摘要:
2014年2月12日在新疆于田县境内西昆仑山东段地区发生了Ms7.3级强烈地震,震后快速野外考察表明,这次地震在海拔4600~5100 m的地区形成了由一系列张裂隙、张剪裂隙、剪切裂隙以及挤压鼓包和裂陷等斜列状组合而成的地表破裂带,整体呈NEE-SWW走向,全长约25 km,显示出左旋走滑伴随有正滑分量的特征,最大左旋位移约1m。地表破裂带分别沿两条平行的阿什库勒-硝尔库勒断裂和南硝尔库勒断裂分布,这是一种特殊的地表破裂带。发震断裂属于阿尔金断裂带西南段尾端分支断裂,它与郭扎错断裂和龙木错断裂构成“新阿尔金断裂”。
关键词:
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于田
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地震
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2014
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野外调查
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地表破碎带
Abstract:
On February 12, 2014, a Ms7.3 earthquake struck the eastern region of the West Kunlun Mountains in Yutian County, Xinjiang. Immediate (Feb 20th) field investigation following the earthquake shows that it produced surface ruptures at an altitude of 4600~5100 m. The surface rupture zone consists of a series of en-echelon tensional, shear-tensional to shear cracks, mole-tracks, and sag ponds. Striking NEE-SWW with a total length of about 25 km, the surface rupture zone is characterized by left-lateral strike slip motion with normal component. Maximum sinistral displacement along the surface rupture zone is about 1 m. What is particularly interesting here is that the surface rupture is distributed along two parallel faults, the Ashikule-Xor Kol fault and the south Xor Kol fault, which is rarely seen. The seismogenic fault of the earthquake is one splay at the southwestern end of the Altun fault. This fault combined with the Gozha Co fault and the Longmu Co fault constitutes a“new Altun fault”.
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