Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2016GL071995 |
Postseismic uplift of the Andes following the 2010 Maule earthquake: Implications for mantle rheology | |
Li, Shaoyang1; Moreno, Marcos1; Bedford, Jonathan1; Rosenau, Matthias1; Heidbach, Oliver1; Melnick, Daniel2,3; Oncken, Onno1 | |
2017-02-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2017 |
卷号 | 44期号:4 |
文章类型 | Article |
语种 | 英语 |
国家 | Germany; Chile |
英文摘要 | Postseismic surface deformation associated with great subduction earthquakes is controlled by asthenosphere rheology, frictional properties of the fault, and structural complexity. Here by modeling GPS displacements in the 6 years following the 2010 M-w 8.8 Maule earthquake in Chile, we investigate the impact of heterogeneous viscosity distribution in the South American subcontinental asthenosphere on the 3-D postseismic deformation pattern. The observed postseismic deformation is characterized by flexure of the South America plate with peak uplift in the Andean mountain range and subsidence in the hinterland. We find that, at the time scale of observation, over 2 orders of magnitude gradual increase in asthenosphere viscosity from the arc area toward the cratonic hinterland is needed to jointly explain horizontal and vertical displacements. Our findings present an efficient method to estimate spatial variations of viscosity, which clearly improves the fitting to the vertical signal of deformation. Lateral changes in asthenosphere viscosity can be correlated with the thermomechanical transition from weak subvolcanic arc mantle to strong subcratonic mantle, thus suggesting a stationary heterogeneous viscosity structure. However, we cannot rule out a transient viscosity structure (e.g., power law rheology) with the short time span of observation. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000396411100018 |
WOS关键词 | TOHOKU-OKI EARTHQUAKE ; VISCOELASTIC RELAXATION ; AFTERSLIP ; CHILE ; DEFORMATION ; FLOW ; MODEL ; RELOCKING ; DENSITY ; SLIP |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/28569 |
专题 | 气候变化 |
作者单位 | 1.GFZ German Res Ctr Geosci, Helmholtz Ctr Potsdam, Potsdam, Germany; 2.Univ Potsdam, Inst Erd & Umweltwissensch, Potsdam, Germany; 3.Univ Austral Chile, TAQUACH, Inst Ciencias Tierra, Valdivia, Chile |
推荐引用方式 GB/T 7714 | Li, Shaoyang,Moreno, Marcos,Bedford, Jonathan,et al. Postseismic uplift of the Andes following the 2010 Maule earthquake: Implications for mantle rheology[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(4). |
APA | Li, Shaoyang.,Moreno, Marcos.,Bedford, Jonathan.,Rosenau, Matthias.,Heidbach, Oliver.,...&Oncken, Onno.(2017).Postseismic uplift of the Andes following the 2010 Maule earthquake: Implications for mantle rheology.GEOPHYSICAL RESEARCH LETTERS,44(4). |
MLA | Li, Shaoyang,et al."Postseismic uplift of the Andes following the 2010 Maule earthquake: Implications for mantle rheology".GEOPHYSICAL RESEARCH LETTERS 44.4(2017). |
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