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Earthquakes drive focused denudation along a tectonically active mountain front
Li, Gen1; West, A. Joshua1; Densmore, Alexander L.2,3; Jin, Zhangdong4; Zhang, Fei4; Wang, Jin4; Clark, Marin5; Hilton, Robert G.2,3
2017-08-15
发表期刊EARTH AND PLANETARY SCIENCE LETTERS
卷号472期号:C页码:253-265
文章类型Article
摘要Earthquakes cause widespread landslides that can increase erosional fluxes observed over years to decades. However, the impact of earthquakes on denudation over the longer timescales relevant to orogenic evolution remains elusive. Here we assess erosion associated with earthquake-triggered landslides in the Longmen Shan range at the eastern margin of the Tibetan Plateau. We use the M(w)7.9 2008 Wenchuan and M(w)6.6 2013 Lushan earthquakes to evaluate how seismicity contributes to the erosional budget from short timescales (annual to decadal, as recorded by sediment fluxes) to long timescales (kyr to Myr, from cosmogenic nuclides and low temperature thermochronology). Over this wide range of timescales, the highest rates of denudation in the Longmen Shan coincide spatially with the region of most intense landsliding during the Wenchuan earthquake. Across sixteen gauged river catchments, sediment flux-derived denudation rates following the Wenchuan earthquake are closely correlated with seismic ground motion and the associated volume of Wenchuan-triggered landslides (r(2) > 0.6), and to a lesser extent with the frequency of high intensity runoff events (r(2) = 0.36). To assess whether earthquake-induced landsliding can contribute importantly to denudation over longer timescales, we model the total volume of landslides triggered by earthquakes of various magnitudes over multiple earthquake cycles. We combine models that predict the volumes of landslides triggered by earthquakes, calibrated against the Wenchuan and Lushan events, with an earthquake magnitude frequency distribution. The long-term, landslide-sustained "seismic erosion rate" is similar in magnitude to regional long-term denudation rates (similar to 0.5-1 mm yr(-1)). The similar magnitude and spatial coincidence suggest that earthquake-triggered landslides are a primary mechanism of long-term denudation in the frontal Longmen Shan. We propose that the location and intensity of seismogenic faulting can contribute to focused denudation along a high-relief plateau margin. (C) 2017 Elsevier B.V. All rights reserved.
关键词Erosion/denudation Earthquake-triggered Landslides Longmen Shan Active Mountain Ranges Mountain Belt Evolution
WOS标题词Science & Technology ; Physical Sciences
DOI10.1016/j.epsl.2017.04.040
关键词[WOS]2008 WENCHUAN EARTHQUAKE ; INDUCED LANDSLIDES ; TIBETAN PLATEAU ; THRESHOLD HILLSLOPES ; EASTERN MARGIN ; FAULT SYSTEM ; EROSION ; SEDIMENT ; RANGES ; UPLIFT
收录类别SCI
语种英语
WOS研究方向Geochemistry & Geophysics
WOS类目Geochemistry & Geophysics
WOS记录号WOS:000405153600023
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被引频次:6[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ieecas.cn/handle/361006/5435
专题加速器质谱中心
作者单位1.Univ Southern Calif, Dept Earth Sci, Los Angeles, CA 90089 USA
2.Univ Durham, Inst Hazard Risk & Resilience, Durham DH1 3LE, England
3.Univ Durham, Dept Geog, Durham DH1 3LE, England
4.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710075, Peoples R China
5.Univ Michigan, Dept Earth & Environm Sci, Ann Arbor, MI 48109 USA
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Li, Gen,West, A. Joshua,Densmore, Alexander L.,et al. Earthquakes drive focused denudation along a tectonically active mountain front[J]. EARTH AND PLANETARY SCIENCE LETTERS,2017,472(C):253-265.
APA Li, Gen.,West, A. Joshua.,Densmore, Alexander L..,Jin, Zhangdong.,Zhang, Fei.,...&Hilton, Robert G..(2017).Earthquakes drive focused denudation along a tectonically active mountain front.EARTH AND PLANETARY SCIENCE LETTERS,472(C),253-265.
MLA Li, Gen,et al."Earthquakes drive focused denudation along a tectonically active mountain front".EARTH AND PLANETARY SCIENCE LETTERS 472.C(2017):253-265.
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