論文

査読有り
2019年11月

3D Fault Structure Inferred from a Refined Aftershock Catalog for the 2015 Gorkha Earthquake in Nepal

BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
  • Masumi Yamada
  • ,
  • Thakur Kandel
  • ,
  • Koji Tamaribuchi
  • ,
  • Abhijit Ghosh

110
1
開始ページ
26
終了ページ
37
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1785/0120190075
出版者・発行元
SEISMOLOGICAL SOC AMER

In this article, we created a well-resolved aftershock catalog for the 2015 Gorkha earthquake in Nepal by processing 11 months of continuous data using an automatic onset and hypocenter determination procedure. Aftershocks were detected by the NAMASTE temporary seismic network that is densely distributed covering the rupture area and became fully operational about 50 days after the mainshock. The catalog was refined using a joint hypocenter determination technique and an optimal 1D velocity model with station correction factors determined simultaneously. We found around 15,000 aftershocks with the magnitude of completeness of M-L 2. Our catalog shows that there are two large aftershock clusters along the north side of the Gorkha-Pokhara anticlinorium and smaller shallow aftershock clusters in the south. The patterns of aftershock distribution in the northern and southern clusters reflect the complex geometry of the Main Himalayan thrust. The aftershocks are located both on the slip surface and through the entire hanging wall. The 1D velocity structure obtained from this study is almost constant at a P-wave velocity (V-P) of 6.0 km/s for a depth of 0-20 km, similar to V-P of the shallow continental crust.

Web of Science ® 被引用回数 : 1

リンク情報
DOI
https://doi.org/10.1785/0120190075
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000512072800003&DestApp=WOS_CPL

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