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首页> 外文期刊>Journal of Asian earth sciences >Rates of Holocene normal faulting along the Dong Co fault in central Tibet, based on ~(14)C dating of displaced fluvial terraces
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Rates of Holocene normal faulting along the Dong Co fault in central Tibet, based on ~(14)C dating of displaced fluvial terraces

机译：基于位移河床阶地〜（14）C测年的藏中Dong Co断裂沿全新世正断层发生率

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摘要

Crustal extension along north-south graben characterizes active deformation within the central Tibetan Plateau. However, the geodynamic significance of these fault systems remains uncertain, in part reflecting sparse data regarding the onset of extension, rate(s) of slip, and paleoseismic histories along these faults. The Dong Co fault is located to the north of the dextral Beng Co fault in central Tibet. Based on the interpretation of satellite images, we use unmanned aerial vehicle (UAV) topographic surveying and C-14 dating of two offset fluvial terraces to characterized active slip along the Dong Co fault of 1.2 +0.3/-0.3 on and 3.7 +0.5/-0.4 m during the past 550-1060 yr BP and 3880-6290 yr BP, respectively. These results indicate that the slip rate of the Dong Co fault during the latter half of the Holocene has been 0.7 +0.3/-0.2 mm/yr. Fault displacement and scaling relationships imply that the most recent earthquake was approximately Mw similar to 7.0. Together with the dextral Beng Co fault system, the Dong Co fault appears to record stretching of a wedge-shaped domain bounded by conjugate strike-slip faults. Our study supports models in which extension along normal faults can accommodate differential stretching between conjugate strike-slip faults.
机译：沿南北grab陷的地壳伸展是青藏高原中部活跃变形的特征。然而，这些断层系统的地球动力学意义仍然不确定，部分反映了沿着这些断层的伸展，滑移率和古地震历史的稀疏数据。 Dong Co断层位于西藏中部右旋Beng Co断层的北部。基于对卫星图像的解释，我们使用无人飞行器（UAV）地形勘测和两个偏移河床阶地的C-14测年来确定沿Dong Co断层1.2 + 0.3 / -0.3 on和3.7 + 0.5 /的活动滑移。过去550-1060年BP和3880-6290年BP分别为-0.4 m。这些结果表明，全新世后半期Dong Co断层的滑动速率为0.7 + 0.3 / -0.2 mm / yr。断层位移和比例关系暗示最近的地震近似于Mw，类似于7.0。连同右旋本古柯断裂系统，东柯断裂似乎记录了由共轭走滑断裂所界定的楔形区域的伸展。我们的研究支持的模型中，沿正常断层的伸展可以适应共轭走滑断层之间的差异拉伸。

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