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2004年12月14日に発生した留萌支庁南部の地震($M_{JMA}$ 6.1)の余震活動

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Title: 2004年12月14日に発生した留萌支庁南部の地震($M_{JMA}$ 6.1)の余震活動
Other Titles: Aftershock Distribution of the December 14, 2004 Rumoi-nanbu Earthquake ($M_{JMA}$ 6.1) in the Northern Part of Hokkaido, Japan
Authors: 一柳, 昌義1 Browse this author
前田, 宜浩2 Browse this author
山口, 照寛3 Browse this author
高橋, 浩晃4 Browse this author →KAKEN DB
笠原, 稔5 Browse this author →KAKEN DB
笹谷, 努6 Browse this author →KAKEN DB
山本, 明彦7 Browse this author
Authors(alt): ICHIYANAGI, Masayoshi1
MAEDA, Takahiro2
YAMAGUCHI, Teruhiro3
SASATANI, Tsutomu6
YAMAMOTO, Akihiko7
Keywords: Aftershock distribution
P-wave velocity structure
Reverse fault
Issue Date: 15-Mar-2007
Publisher: 日本地震学会
Journal Title: 地震. 2輯
Volume: 59
Issue: 3
Start Page: 209
End Page: 221
Publisher DOI: 10.4294/zisin.59.209
Abstract: On December 14, 2004, an M 6.1 earthquake occurred in the northwestern part of Hokkaido, Japan. We installed nine temporal seismic stations around the source area immediately after the occurrence and had continued the observation for about two months after the main shock. We determined 823 hypocenters of aftershocks and one dimensional P-wave velocity structure model from the travel time data. It is found that aftershocks are clearly distributed on an eastward dipping plane with a dip angle of about 25 degrees. This plane agrees well with one of the nodal planes of the focal mechanism determined by P-wave first motions in this study. Next, we investigated a position of the main shock relative to the aftershock distribution. The station correction values for permanent stations were determined from the data during the period of the temporary observation. Estimated main shock hypocenter was confirmed to be situated on the aftershock plane. Finally, we estimated three-dimensional P-wave velocity structure based on the temporary travel time data. Relocated aftershocks using the three dimensional velocity structure were mainly distributed along the boundary between the high and low velocity zones.
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 高橋 浩晃

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