Widespread ground motion distribution caused by rupture directivity during the 2015 Gorkha, Nepal earthquake

DOI DOI DOI PDF Web Site ほか1件をすべて表示 一部だけ表示 被引用文献4件 参考文献28件 オープンアクセス

書誌事項

公開日
2016-06-23
資源種別
journal article
権利情報
  • https://creativecommons.org/licenses/by/4.0
  • https://creativecommons.org/licenses/by/4.0
DOI
  • 10.1038/srep28536
  • 10.60692/2zh2r-9aa83
  • 10.60692/2aj18-y8955
公開者
Springer Science and Business Media LLC

説明

<jats:title>Abstract</jats:title><jats:p>The ground motion and damage caused by the 2015 Gorkha, Nepal earthquake can be characterized by their widespread distributions to the east. Evidence from strong ground motions, regional acceleration duration, and teleseismic waveforms indicate that rupture directivity contributed significantly to these distributions. This phenomenon has been thought to occur only if a strike-slip or dip-slip rupture propagates to a site in the along-strike or updip direction, respectively. However, even though the earthquake was a dip-slip faulting event and its source fault strike was nearly eastward, evidence for rupture directivity is found in the eastward direction. Here, we explore the reasons for this apparent inconsistency by performing a joint source inversion of seismic and geodetic datasets, and conducting ground motion simulations. The results indicate that the earthquake occurred on the underthrusting Indian lithosphere, with a low dip angle, and that the fault rupture propagated in the along-strike direction at a velocity just slightly below the <jats:italic>S</jats:italic>-wave velocity. This low dip angle and fast rupture velocity produced rupture directivity in the along-strike direction, which caused widespread ground motion distribution and significant damage extending far eastwards, from central Nepal to Mount Everest.</jats:p>

収録刊行物

  • Scientific Reports

    Scientific Reports 6 (1), 28536-, 2016-06-23

    Springer Science and Business Media LLC

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