Aftershock seismicity and fault structure of the 2005 West Off Fukuoka Prefecture Earthquake (MJMA7.0) derived from urgent joint observations
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概要
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On March 20, 2005, a large <I>M</I><SUB>JMA</SUB>7.0 earthquake occurred in the offshore area, west of Fukuoka prefecture, northern Kyushu, Japan. A series of joint observations were carried out by teams from several universities in Japan with the aim of investigating the aftershock activity. Six online telemetered and 17 offline recording seismic stations were installed on land around the aftershock area immediately followed the occurrence of the mainshock. Because aftershocks were located mainly in offshore regions, we also installed 11 ocean bottom seismometers (OBSs) just above the aftershock region and its vicinity in order to obtain accurate locations of hypocenters. The OBS observation was carried out from March 27 to April 13, 2005. We further conducted temporary GPS observations in which ten GPS receivers were deployed around the aftershock region. The aftershocks were mainly aligned along an approximately 25-km-long NW-SE trend, and the hypocenters of the main aftershock region were distributed on a nearly vertical plane at depths of 2-16 km. The mainshock was located near the central part of the main aftershock region at a depth of approximately 10 km. The largest aftershock of MJMA5.8 occurred near the southeastern edge of the main aftershock region, and the aftershock region subsequently extended about 5 km in the SE direction as defined by secondary aftershock activity. Enlargement of the aftershock region did not occur after the peak in aftershock activity, and the aftershock activity gradually declined. The distribution of hypocenters and seismogenic stress as defined by aftershocks suggest that the 2005 West Off Fukuoka Prefecture Earthquake occurred on the fault that is the NW extension of the Kego fault, which extends NW-SE through the Fukuoka metropolitan area, and that the largest aftershock occurred at the northwestern tip of the Kego fault.
- 公益社団法人 日本地震学会、地球電磁気・地球惑星圏学会 、特定非営利活動法人 日本火山学会、日本測地学会、日本惑星科学会の論文
著者
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Yamada Tomoaki
Earthquake Res. Inst. Univ. Of Tokyo Tokyo 113-0032 Jpn
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MATSUMOTO Satoshi
Institute of Seismology and Volcanology, Faculty of Science, Kyushu University
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ENESCU Bogdan
Disaster Prevention Research Institute, Kyoto University
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Iwasaki Takaya
Earthquake Research Institute The University Of Tokyo
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Uehira Kenji
Institute Of Seismology And Volcanology Faculty Of Science Kyushu University
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MIYAMACHI Hiroki
Nansei-Toko Observatory for Earthquakes and Volcanoes, Faculty of Science, Kagoshima University
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GOTO Kazuhiko
Nansei-Toko Observatory for Earthquakes and Volcanoes, Faculty of Science, Kagoshima University
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KAME Nobuki
Faculty of Sciences, Kyushu University
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UCHIDA Kazunari
Institute of Seismology and Volcanology, Faculty of Sciences, Kyushu University
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Kohno Yuhki
Institute Of Seismology And Volcanology Faculty Of Sciences Kyushu University
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Kanazawa Toshihiko
Earthquake Research Institute The University Of Tokyo
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Hori Mio
Institute Of Seismology And Volcanology Faculty Of Sciences Kyushu University
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Urabe Taku
Earthquake Research Institute University Of Tokyo
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Okada Tomomi
Research Center For Prediction Of Earthquakes And Volcanic Eruptions Graduate School Of Science Toho
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Iio Yoshihisa
Disaster Prevention Research Institute Kyoto University
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Nakao Shigeru
Nansei-toko Observatory For Earthquakes And Volcanoes Faculty Of Science Kagoshima University
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Katao Hiroshi
Disaster Prevention Research Institute Kyoto University
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Yagi Takeo
Earthquake Research Institute University Of Tokyo
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Hirata Naoshi
Earthquake Research Institute The University Of Tokyo
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Hirano Syuichiro
Nansei-toko Observatory For Earthquakes And Volcanoes Faculty Of Science Kagoshima University
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Matsushima Takeshi
Institute For Solid State Physics University Of Tokyo
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Uchida Naoki
Research Center For Prediction Of Earthquakes And Volcanic Eruptions Graduate School Of Science Toho
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Matsuwo Norimichi
Institute Of Seismology And Volcanology Faculty Of Sciences Kyushu University
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Shimizu Hiroshi
Institute Of Seismology And Volcanology Kyushu University
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Nakahigashi Kazuo
Earthquake Research Institute The University Of Tokyo
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Ichiyanagi Masayoshi
Institute Of Seismology And Volcanology Graduate School Hokkaido University
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Saito Masaki
Institute Of Seismology And Volcanology Faculty Of Sciences Kyushu University
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Watanabe Atsushi
Institute Of Biological Sciences University Of Tskuba
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Takahashi Hiroaki
Instit.of Environ.toxicol.
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Ueno Tomotake
Disaster Prevention Research Institute Kyoto University
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Shinohara Masanao
Earthquake Research Institute (eri) University Of Tokyo
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Yakiwara Hiroshi
Nansei-toko Observatory For Earthquakes And Volcanoes Faculty Of Science Kagoshima University
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