首页> 外文期刊>Journal of Asian earth sciences >Elastic block and strain modeling of GPS data around the Haiyuan-Liupanshan fault, northeastern Tibetan Plateau
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Elastic block and strain modeling of GPS data around the Haiyuan-Liupanshan fault, northeastern Tibetan Plateau

机译:青藏高原东北部海原-六盘山断裂带附近GPS数据的弹性块和应变模拟

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摘要

Based on the dense GPS velocity field in the northeastern margin of the Tibetan Plateau from 1999 to 2016, we have produced the deformation and strain characteristics of the Haiyuan fault and the Liupanshan fault. Estimated long-term slip rate along the Haiyuan-Liupanshan fault zones show a gradual decrease from 6.4 +/- 1.6 mm/yr at the Tuolaishan fault to 2.9 +/- 1.2 mm/yr at the Southern Liupanshan fault. Left-lateral thrusting movement was inverted for the Xiangshan-Tianjingshan fault (XS-TJS), which has an average slip rate of 2.1 +/- 3.4 mm/yr during the study period. We also calculated the heterogeneous distribution of interseismic coupling along the fault zones. Our result also shows the locking depth of the Tianzhu seismic gap is 22 km. The slip rate deficit, the seismic moment accumulation rate, and the Coulomb stress accumulation rate are high on the fault planes, whereas the second invariant of the strain rate is low at the surface. The Liupanshan fault is locked to a depth of 23 km, and the corresponding seismic moment accumulation rate on the fault plane is high, while the strain rate at the surface is low. The accumulated strain along the Tianzhu seismic gap and the Liupanshan fault could be balanced by earthquakes with magnitudes of Mw7.9 and Mw7.4, considering the absence of large earthquakes over the last 1000 years and 1400 years respectively. The Haiyuan segments had ruptured during 1920 Haiyuan earthquake, and the estimated locking depth for period 1999-2016 is 5-10 km. Its seismic moment accumulation rate at depth is low and the strain rate at the surface is high. Our result indicates that 70% of the strike-slip along the Haiyuan segments transforms into thrusting along the Liupanshan fault, while the remaining 30% is related to the orogeny of the Liupanshan. For slip between the Haiyuan fault and the XS-TJS, about 27-34% of the slip is partitioned on the XS-TJS.
机译:基于1999-2016年青藏高原东北缘稠密的GPS速度场,我们得出了海原断层和六盘山断层的变形和应变特征。沿海原-六盘山断裂带的估计长期滑移率显示,从拖来山断裂带的6.4 +/- 1.6 mm / yr逐渐降低到六盘山南部断裂带的2.9 +/- 1.2 mm / yr。香山—天山断裂(XS-TJS)的左旋逆冲运动反转,在研究期间平均滑移率为2.1 +/- 3.4毫米/年。我们还计算了沿断层带的地震耦合的非均质分布。我们的结果还表明,天柱地震带的锁定深度为22 km。断层平面上的滑移率赤字,地震矩累积率和库仑应力累积率较高,而地表应变率的第二不变性较低。六盘山断层的锁定深度为23 km,断层面上相应的地震矩累积率较高,而地表应变率较低。考虑到过去1000年和1400年分别没有大地震,天祝地震带和六盘山断裂带沿线的累积应变可以通过Mw7.9和Mw7.4地震平衡。 1920年海原地震期间,海原路段破裂,估计1999-2016年的锁定深度为5-10公里。它在深处的地震矩累积率低,在地表的应变率高。我们的结果表明,沿海原段的走滑带有70%转变为沿六盘山断裂带的逆冲运动,而其余的30%与六盘山的造山运动有关。对于海原断层和XS-TJS之间的滑移,大约27-34%的滑移在XS-TJS上划分。

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  • 来源
    《Journal of Asian earth sciences》 |2017年第12期|87-97|共11页
  • 作者单位

    China Earthquake Adm, Inst Geol, State Key Lab Earthquake Dynam, Beijing, Peoples R China|Univ Cote Azur, Observ Cote Azur, CNRS, Geoazur,IRD, Vdlbonne, France;

    China Earthquake Adm, Inst Geol, State Key Lab Earthquake Dynam, Beijing, Peoples R China;

    China Earthquake Adm, Inst Geol, State Key Lab Earthquake Dynam, Beijing, Peoples R China;

    China Earthquake Adm, Inst Geol, State Key Lab Earthquake Dynam, Beijing, Peoples R China;

    China Earthquake Adm, Inst Geol, State Key Lab Earthquake Dynam, Beijing, Peoples R China;

    China Earthquake Adm, Inst Geol, State Key Lab Earthquake Dynam, Beijing, Peoples R China;

    China Earthquake Adm, Inst Geol, State Key Lab Earthquake Dynam, Beijing, Peoples R China;

    Univ Cote Azur, Observ Cote Azur, CNRS, Geoazur,IRD, Vdlbonne, France;

    China Earthquake Adm, Inst Geol, State Key Lab Earthquake Dynam, Beijing, Peoples R China;

    China Earthquake Adm, Inst Geol, State Key Lab Earthquake Dynam, Beijing, Peoples R China;

    Shenzhen Univ, Shenzhen Key Lab Spatial Smart Sensing & Serv, Shenzhen, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Haiyuan-Liupanshan fault; Fault interseismic coupling; Strain; GPS;

    机译:海原-六盘山断裂;断裂间地震耦合;应变;GPS;

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