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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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Title: 2012年に発生した渡島地方森町濁川カルデラでの群発地震活動
Other Titles: The 2012 Earthquake Swarm in Nigorikawa Caldera, Hokkaido
Authors: 一柳, 昌義1 Browse this author
笠原, 稔2 Browse this author
高橋, 浩晃3 Browse this author →KAKEN DB
岡崎, 紀俊4 Browse this author
高橋, 良5 Browse this author
大園, 真子6 Browse this author
Authors(alt): ICHIYANAGI, Masayoshi1
OKAZAKI, Noritoshi4
Issue Date: 19-Mar-2014
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: 77
Start Page: 5
End Page: 13
Abstract: An earthquake swarm begun at the end of January, 2012 and the activity reached a peak in middle February, then gradually decreased by the end of April, in the Nigorikawa caldera, Hokkaido. The largest earthquake was the MJMA3.6 event which occurred on 15 February 2012 with maximum intensity 3.Temporal seismic observation with two stations carried out from 20 February to 9 April in the caldera. Detailed hypocenter distribution estimated by using both data temporal and secular observations shows two clusters, one of them is aligned along the northern caldera wall and another is located at eastern outside of caldera. Strike of alignment epicenter of the north cluster shows NE-SW direction, which is in good agreement with one of the nodal plane of focal mechanism of the largest event.
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77号

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