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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
Source PublicationEARTH AND PLANETARY SCIENCE LETTERS
Volume472Issue:CPages:253-265
SubtypeArticle
AbstractEarthquakes 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.
KeywordErosion/denudation Earthquake-triggered Landslides Longmen Shan Active Mountain Ranges Mountain Belt Evolution
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1016/j.epsl.2017.04.040
WOS Keyword2008 WENCHUAN EARTHQUAKE ; INDUCED LANDSLIDES ; TIBETAN PLATEAU ; THRESHOLD HILLSLOPES ; EASTERN MARGIN ; FAULT SYSTEM ; EROSION ; SEDIMENT ; RANGES ; UPLIFT
Indexed BySCI
Language英语
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000405153600023
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/5435
Collection加速器质谱中心
Affiliation1.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
Recommended Citation
GB/T 7714
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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