Aftershock activity of the 2015 Gorkha, Nepal, earthquake determined using the Kathmandu strong motion seismographic array the 2015 Gorkha, Nepal, Earthquake and Himalayan Studies

Masayoshi Ichiyanagi, Nobuo Takai, Michiko Shigefuji, Subeg Bijukchhen, Tsutomu Sasatani, Sudhir Rajaure, Megh Raj Dhital, Hiroaki Takahashi

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The characteristics of aftershock activity of the 2015 Gorkha, Nepal, earthquake (Mw 7.8) were evaluated. The mainshock and aftershocks were recorded continuously by the international Kathmandu strong motion seismographic array operated by Hokkaido University and Tribhuvan University. Full waveform data without saturation for all events enabled us to clarify aftershock locations and decay characteristics. The aftershock distribution was determined using the estimated local velocity structure. The hypocenter distribution in the Kathmandu metropolitan region was well determined and indicated earthquakes located shallower than 12 km depth, suggesting that aftershocks occurred at depths shallower than the Himalayan main thrust fault. Although numerical investigation suggested less resolution for the depth component, the regional aftershock epicentral distribution of the entire focal region clearly indicated earthquakes concentrated in the eastern margin of the major slip region of the mainshock. The calculated modified Omori law's p value of 1.35 suggests rapid aftershock decay and a possible high temperature structure in the aftershock region.

元の言語英語
記事番号25
ジャーナルearth, planets and space
68
発行部数1
DOI
出版物ステータス出版済み - 12 1 2016
外部発表Yes

All Science Journal Classification (ASJC) codes

  • Geology
  • Space and Planetary Science

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