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北海道大学地球物理学研究報告 = Geophysical bulletin of Hokkaido University >
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2014年7月8日に発生した北海道白老町付近(胆振地方中東部)の地震(MJMA 5.6)について

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Title: 2014年7月8日に発生した北海道白老町付近(胆振地方中東部)の地震(MJMA 5.6)について
Other Titles: Seismic activity associated with the 2014 Shiraoi earthquake (MJMA 5.6) in middle east Iburi region, Hokkaido
Authors: 一柳, 昌義1 Browse this author
シェスタコフ, ニコライ2 Browse this author
奥山, 哲3 Browse this author
大園, 真子4 Browse this author
笠原, 稔5 Browse this author
高橋, 浩晃6 Browse this author
Authors(alt): ICHIYANAGI, Masayoshi1
SHESTAKOV, Nikolay V.2
OKUYAMA, Satoshi3
Issue Date: 19-Mar-2018
Publisher: 北海道大学大学院理学研究院
Journal Title: 北海道大学地球物理学研究報告
Journal Title(alt): Geophysical bulletin of Hokkaido University
Volume: 81
Start Page: 17
End Page: 26
Abstract: A M5.6 shallow earthquake occurred on 8 July 2014 in middle east Iburi region, southwestern Hokkaido. Maximum seismic intensity of 5- was observed at Shiraoi town. Three temporal seismic stations had been installed in the focal region from 9 July 2014 to 30 April 2015. We determined 384 aftershock hypocenters by the double-difference tomographic hypocenter determination with proper seismic velocity structure. Relocated aftershocks were clearly distributed on a southeastern ward dipping plane with 5~10 km depth. This configuration agreed with a nodal plane of mainshock focal mechanism. Aftershocks occurred in surrounding part of a low seismicity patch. Mainshock was located deepest part of aftershock zone. These facts suggested that mainshock rupture propagated from deep to shallow, and a low seismicity patch was mainshock slip area. No clear correlation between this earthquake sequence and nearest active Tarumae volcano activity were identified.
Type: bulletin (article)
Appears in Collections:北海道大学地球物理学研究報告 = Geophysical bulletin of Hokkaido University > 第81号

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