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

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Title: Aftershock activity of the 2015 Gorkha, Nepal, earthquake determined using the Kathmandu strong motion seismographic array
Authors: Ichiyanagi, Masayoshi Browse this author
Takai, Nobuo Browse this author →KAKEN DB
Shigefuji, Michiko Browse this author
Bijukchhen, Subeg Browse this author
Sasatani, Tsutomu Browse this author →KAKEN DB
Rajaure, Sudhir Browse this author
Dhital, Megh Raj Browse this author
Takahashi, Hiroaki Browse this author →KAKEN DB
Keywords: 2015 Gorkha Nepal earthquake
Aftershock activity
Local seismographic array
Issue Date: 18-Feb-2016
Publisher: Springer
Journal Title: Earth, Planets and Space
Volume: 68
Issue: 1
Start Page: 1
End Page: 6
Publisher DOI: 10.1186/s40623-016-0402-8
Abstract: 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.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 高井 伸雄

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