Pulse‐like partial ruptures and high‐frequency radiation at creeping‐locked transition during megathrust earthquakes

DOI Web Site Web Site Web Site Web Site ほか1件をすべて表示 一部だけ表示 被引用文献3件
  • Sylvain Michel
    Bullard Laboratories, Department of Earth Sciences University of Cambridge Cambridge UK
  • Jean‐Philippe Avouac
    Division of Geological and Planetary Sciences California Institute of Technology Pasadena California USA
  • Nadia Lapusta
    Division of Geological and Planetary Sciences California Institute of Technology Pasadena California USA
  • Junle Jiang
    Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography University of California, San Diego La Jolla California USA

書誌事項

公開日
2017-08-28
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#am
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/2017gl074725
公開者
American Geophysical Union (AGU)

この論文をさがす

説明

<jats:title>Abstract</jats:title><jats:p>Megathrust earthquakes tend to be confined to fault areas locked in the interseismic period and often rupture them only partially. For example, during the 2015 <jats:italic>M</jats:italic>7.8 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 (>1 Hz) 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.</jats:p>

収録刊行物

被引用文献 (3)*注記

もっと見る

問題の指摘

ページトップへ