Aftershock Distribution of the December 14, 2004 Rumoi-nanbu Earthquake (<i>M</i> 6.1) in the Northern Part of Hokkaido, Japan
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- ICHIYANAGI Masayoshi
- Institute of Seismology and Volcanology, Graduate School of Science, Hokkaido University
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- MAEDA Takahiro
- Institute of Seismology and Volcanology, Graduate School of Science, Hokkaido University
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- YAMAGUCHI Teruhiro
- Institute of Seismology and Volcanology, Graduate School of Science, Hokkaido University
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- TAKAHASHI Hiroaki
- Institute of Seismology and Volcanology, Graduate School of Science, Hokkaido University
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- KASAHARA Minoru
- Institute of Seismology and Volcanology, Graduate School of Science, Hokkaido University
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- SASATANI Tsutomu
- Department of Natural History Sciences, Faculty of Science, Hokkaido University
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- YAMAMOTO Akihiko
- Department of Earth’s Evolution and Environment, Division of Mathematics, Physics, and Earth Sciences, Graduate School of Science and Engineering, Ehime University
Bibliographic Information
- Other Title
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- 2004年 12月 14日に発生した留萌支庁南部の地震 (<i>M</i><sub>JMA</sub> 6.1)の余震活動
- 2004年12月14日に発生した留萌支庁南部の地震(MJMA6.1)の余震活動
- 2004ネン 12ガツ ジュウヨッカ ニ ハッセイシタ ルモイ シチョウ ナンブ ノ ジシン M JMA 6 1 ノ ヨシン カツドウ
- Aftershock Distribution of the December 14, 2004 Rumoi-nanbu Earthquake (M 6.1) in the Northern Part of Hokkaido, Japan
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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.
Journal
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- Zisin (Journal of the Seismological Society of Japan. 2nd ser.)
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Zisin (Journal of the Seismological Society of Japan. 2nd ser.) 59 (3), 209-221, 2007
SEISMOLOGICAL SOCIETY OF JAPAN
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Details
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- CRID
- 1390282679281021824
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- NII Article ID
- 130004562015
- 120005540310
- 10018919445
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- NII Book ID
- AN00305741
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- ISSN
- 18839029
- 2186599X
- 00371114
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- HANDLE
- 2115/57960
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- NDL BIB ID
- 8781139
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- Text Lang
- ja
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- Data Source
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- JaLC
- IRDB
- NDL
- Crossref
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Disallowed