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Title: 高密度臨時地震観測による2004年斜里岳群発地震活動
Other Titles: Seismic activity of the 2004 Syari-dake Earthquake swarm by dense temporary seismic observation network in the eastern part of Hokkaido, Japan
Authors: 一柳, 昌義1 Browse this author
高橋, 浩晃2 Browse this author
山口, 照寛3 Browse this author
高田, 真秀4 Browse this author
岡山, 宗夫5 Browse this author
笠原, 稔6 Browse this author
岡崎, 紀俊7 Browse this author
Authors(alt): Ichiyanagi, Masayoshi1
Takahashi, Hiroaki2
Yamaguchi, Teruhiro3
Takada, Masamitsu4
Okayama, Muneo5
Kasahara, Minoru6
Okazaki, Noritoshi7
Issue Date: 15-Mar-2009
Publisher: 北海道大学大学院理学研究院自然史科学部門(地球物理学)
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: 72
Start Page: 299
End Page: 314
Abstract: From April 27, 2004, Mt. Syari-dake earthquake swarm occurred in the eastern part of Hokkaido, Japan. The activity began at 4:19 on April 27, 2004. We installed nine temporary seismic stations around the seismic active area immediately after its occurrence and had continued the observation for about seven months. We determined 2228 hypocenters of earthquakes. It is found that the seismic active area is clearly distributed on the plane having southwest-northeast strike with dip angle of about 80 degrees. This plane well agrees with one of the nodal planes of the focal mechanisms of several earthquakes determined by P-wave first motions. Hypocenters migrate northeastward at a rate of 96 m/day and westward at a rate of 51 m/day. We also investigated hypocenter distribution before the installing of the temporary seismic stations. To improve accuracy of hypocenter determination we applied travel time correction for every permanent seismic stations. Relocated precise hypocenters demonstrate that the main seismic activity started to expand eastward just after the begining of the swarm.
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72号

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