紀要論文 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
Seismic activity associated with the 2014 Shiraoi earthquake (MJMA 5.6) in middle east Iburi region, Hokkaido

一柳, 昌義  ,  シェスタコフ, ニコライ  ,  奥山, 哲  ,  大園, 真子  ,  笠原, 稔  ,  高橋, 浩晃

81pp.17 - 26 , 2018-03-19 , 北海道大学大学院理学研究院
ISSN:0439-3503
NII書誌ID(NCID):AN0008976X
内容記述
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.
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https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/68475/1/GBHU_81_p17-.pdf

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