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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >A 48-kyr-long slip rate history for the Jordan Valley segment of the Dead Sea Fault
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A 48-kyr-long slip rate history for the Jordan Valley segment of the Dead Sea Fault

机译：死海断层约旦河谷段的滑移率历史记录为48 kyr

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摘要

We investigate the late Quaternary active deformation along the Jordan Valley segment of the left-lateral Dead Sea Fault and provide new insights on the behaviour of major continental faults. The 110-km-long fault segment shows systematic offsets of drainage systems surveyed at three sites along its southern section. The isotopic dating of six paleoclimatic events yields a precise chronology for the onset of six generations of gully incisions at 47.5 ka BP, 37.5 ka BP, 13 ka BP, 9 ka BP, 7 ka BP, and 5 ka BP. Additionally, detailed mapping and reconstructions provide cumulative displacements for 20 dated incisions along the fault trace. The individual amounts of cumulative slip consistently fall into six distinct classes. This yields: i) an average constant slip rate of 4.7 to 5.1 mm/yr for the last 47.5 kyr and ii) a variable slip rate ranging from 3.5 mm/yr to 11 mm/yr over 2-kyr- to 24-kyr-long intervals. Taking into account that the last large earthquake occurred in AD 1033, we infer 3.5 to 5 in of present-day slip deficit which corresponds to a Mw similar to 7.4 earthquake along the Jordan Valley fault segment. The timing of cumulative offsets reveals slip rate variations critical to our understanding of the slip deficit and seismic cycle along major continental faults. (C) 2007 Elsevier B.V. All rights reserved.
机译：我们调查了左侧死海断裂约旦河谷段的第四纪晚期活动变形，并对主要大陆断裂的行为提供了新的见解。长达110公里的断层段显示了沿其南部剖面的三个站点所测量的排水系统的系统偏移。六个古气候事件的同位素测年为6代沟口切口的开始提供了精确的年代，分别为47.5 ka BP，37.5 ka BP，13 ka BP，9 ka BP，7 ka BP和5 ka BP。此外，详细的制图和重建功能可沿断层迹线为20个陈旧的切口提供累积位移。单个的累积滑移量始终属于六个不同的类别。这样得出：i）最后47.5千瓦时的平均恒定滑移率在4.7至5.1毫米/年，并且ii）2千瓦至24千瓦时在3.5毫米/年至11毫米/年的可变滑移率间隔长。考虑到最近一次大地震发生在公元1033年，我们推断出今天的滑移赤字为3.5至5英寸，相当于约旦河谷断裂带的Mw类似于7.4级地震。累积偏移的时间揭示了滑移速率变化，这对于我们对沿主要大陆断层的滑移赤字和地震周期的理解至关重要。 （C）2007 Elsevier B.V.保留所有权利。

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