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DOI | 10.1002/2017GL074725 |
Pulse-like partial ruptures and high-frequency radiation at creeping-locked transition during megathrust earthquakes | |
Michel, Sylvain1,2; Avouac, Jean-Philippe2; Lapusta, Nadia2,3; Jiang, Junle4 | |
2017-08-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2017 |
卷号 | 44期号:16 |
文章类型 | Article |
语种 | 英语 |
国家 | England; USA |
英文摘要 | Megathrust earthquakes tend to be confined to fault areas locked in the interseismic period and often rupture them only partially. For example, during the 2015M7.8 Gorkha earthquake, Nepal, a slip pulse propagating along strike unzipped the bottom edge of the locked portion of the Main Himalayan Thrust (MHT). The lower edge of the rupture produced dominant high-frequency (>1Hz) radiation of seismic waves. We show that similar partial ruptures occur spontaneously in a simple dynamic model of earthquake sequences. The fault is governed by standard laboratory-based rate-and-state friction with the aging law and contains one homogenous velocity-weakening (VW) region embedded in a velocity-strengthening (VS) area. Our simulations incorporate inertial wave-mediated effects during seismic ruptures (they are thus fully dynamic) and account for all phases of the seismic cycle in a self-consistent way. Earthquakes nucleate at the edge of the VW area and partial ruptures tend to stay confined within this zone of higher prestress, producing pulse-like ruptures that propagate along strike. The amplitude of the high-frequency sources is enhanced in the zone of higher, heterogeneous stress at the edge of the VW area. |
英文关键词 | Partial Ruptures Pulse High Frequency Radiation Megathrusts Gorkha earthquake Main Himalayan Thrust |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000410658800031 |
WOS关键词 | 2015 GORKHA EARTHQUAKE ; VELOCITY-WEAKENING FRICTION ; MAIN HIMALAYAN THRUST ; DYNAMIC RUPTURE ; SLIP ; FAULT ; NEPAL ; PHYSICS ; ZONE |
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/26582 |
专题 | 气候变化 |
作者单位 | 1.Univ Cambridge, Dept Earth Sci, Bullard Labs, Cambridge, England; 2.CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA; 3.CALTECH, Div Engn & Appl Sci, Pasadena, CA 91125 USA; 4.Univ Calif San Diego, Inst Geophys & Planetary Phys, Scripps Inst Oceanog, La Jolla, CA 92093 USA |
推荐引用方式 GB/T 7714 | Michel, Sylvain,Avouac, Jean-Philippe,Lapusta, Nadia,et al. Pulse-like partial ruptures and high-frequency radiation at creeping-locked transition during megathrust earthquakes[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(16). |
APA | Michel, Sylvain,Avouac, Jean-Philippe,Lapusta, Nadia,&Jiang, Junle.(2017).Pulse-like partial ruptures and high-frequency radiation at creeping-locked transition during megathrust earthquakes.GEOPHYSICAL RESEARCH LETTERS,44(16). |
MLA | Michel, Sylvain,et al."Pulse-like partial ruptures and high-frequency radiation at creeping-locked transition during megathrust earthquakes".GEOPHYSICAL RESEARCH LETTERS 44.16(2017). |
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