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首页> 外文期刊>Journal of structural geology >Late quaternary slip behavior of the Yushu fault and the 2010 Ms 7.1 Yushu earthquake, eastern Tibetan Plateau
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Late quaternary slip behavior of the Yushu fault and the 2010 Ms 7.1 Yushu earthquake, eastern Tibetan Plateau

机译：青藏高原东部玉树断裂的晚第四纪滑动行为与2010年玉树7.1级地震

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摘要

The 2010 Ms 7.1 Yushu earthquake generated a 30-km-long surface rupture along the Gyêgu segment of the Yushu fault within the eastern margin of the Tibetan Plateau. Comparison of the surface slip distribution from this earthquake with the cumulative slips provides a basis to examine repeated activity through several earthquake cycles along the Yushu fault. To better understand the seismic behavior of the Yushu fault, we conducted geomorphological and geological investigations on the 2010 slip and cumulative offsets along the fault at several typical sites. Field observation and satellite image interpretation shows that the coseismic surface ruptures typical of the 2010 Yushu earthquake are discontinuous and usually do not show distinct slip at places where the accumulated displacements are large. Measurements made both in the field and on the satellite images show that the surface slip of the 2010 event was comparatively small and contributed little to cumulative displacement of the fault. Repeated offsets of 6–8 m characterize slip associated with events prior to 2010 along the Yushu fault, whereas the 2010 earthquake produced offsets only on the order of 1 m. In addition, surface ruptures from the magnitude 7.1 event involved the failure of less than half of the Gyêgu fault segment and did not terminate at major geometrical and geological breaks in the fault zone. Geomorphic evidence implies that the fundamental behavior of the Gyêgu fault segment is typically expressed as full-length rupture activity. Thus, data from this study suggests that the characteristic slip along the Yushu fault is 6–8 m, the Ms 7.1 earthquake was not likely a characteristic event along the Yushu fault and the 2010-type events may make some contribution to the low slip rate and long recurrence interval of large earthquakes on the Yushu fault.
机译：2010年的玉树7.1级地震在青藏高原东缘的玉树断裂的Gygugu段沿地带破裂了30公里。将这次地震的地表滑动分布与累积的滑动进行比较，为研究沿玉树断裂的几次地震循环中的重复活动提供了基础。为了更好地了解玉树断裂的地震行为，我们在几个典型地点对2010年滑坡和沿断裂的累积偏移量进行了地貌和地质调查。现场观察和卫星图像解释表明，2010年玉树地震典型的同震表面破裂是不连续的，并且在累积位移大的地方通常没有明显的滑动。在野外和卫星图像上进行的测量表明，2010年事件的表面滑移相对较小，对断层的累积位移几乎没有贡献。重复的6-8µm偏移是与玉树断裂带2010年之前事件相关的滑动的特征，而2010年地震仅产生了1µm数量级的偏移。此外，7.1级地震造成的地表破裂涉及不到Gyêgu断层段的一半，并且没有在断层带的主要几何和地质断裂处终止。地貌证据表明，Gyêgu断层段的基本行为通常表示为全长断裂活动。因此，这项研究的数据表明，玉树断裂带的特征滑移为6-8 m，7.1级地震不太可能是玉树断裂带的特征性事件，而2010年类型的地震可能对低滑移率有所贡献。玉树断裂带大地震的复发间隔长。

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