Large paleoearthquake timing and displacement near Damak in eastern Nepal on the Himalayan Frontal Thrust

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  • Steven G. Wesnousky
    Center for Neotectonic Studies and Seismological Laboratory University of Nevada Reno Nevada USA
  • Yasuhiro Kumahara
    Graduate School of Education Hiroshima University Hiroshima Japan
  • Deepak Chamlagain
    Center for Neotectonic Studies and Seismological Laboratory University of Nevada Reno Nevada USA
  • Ian K. Pierce
    Center for Neotectonic Studies and Seismological Laboratory University of Nevada Reno Nevada USA
  • Tabor Reedy
    Center for Neotectonic Studies and Seismological Laboratory University of Nevada Reno Nevada USA
  • Stephen J. Angster
    Center for Neotectonic Studies and Seismological Laboratory University of Nevada Reno Nevada USA
  • Bibek Giri
    Central Department of Geology Tribhuvan University Kirtipur Nepal

書誌事項

公開日
2017-08-19
資源種別
journal article
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#am
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/2017gl074270
公開者
American Geophysical Union (AGU)

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説明

<jats:title>Abstract</jats:title><jats:p>An excavation across the Himalayan Frontal Thrust near Damak in eastern Nepal shows displacement on a fault plane dipping ~22° has produced vertical separation across a scarp equal to 5.5 m. Stratigraphic, structural, geometrical, and radiocarbon observations are interpreted to indicate that the displacement is the result of a single earthquake of 11.3 ± 3.5 m of dip‐slip displacement that occurred 1146–1256 A.D. Empirical scaling laws indicate that thrust earthquakes characterized by average displacements of this size may produce rupture lengths of 450 to >800 km and moment magnitudes<jats:italic>M</jats:italic><jats:sub><jats:italic>w</jats:italic></jats:sub>of 8.6 to >9. Sufficient strain has accumulated along this portion of the Himalayan arc during the roughly 800 years since the 1146–1256 A.D. earthquake to produce another earthquake displacement of similar size.</jats:p>

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