Aftershock distribution and 3D seismic velocity structure in and around the focal area of the 2004 mid Niigata prefecture earthquake obtained by applying double-difference tomography to dense temporary seismic network data
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概要
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A destructive large earthquake (the 2004 mid Niigata prefecture earthquake) sequence occurred in the central part (Chuetsu district) of Niigata prefecture, central Japan on October 23, 2004. We have deployed a temporary seismic network composed of 54 stations for aftershock observation just above and around the focal area of the earthquake for about a month. Using travel time data from the temporary seismic network and surrounding routine stations, we obtained precise aftershock distribution and 3D seismic velocity structure in and around the fault planes of the earthquake and four major (M ≥ 6) aftershocks by double-difference tomography. The results clearly show three major aftershock alignments. Two of them are almost parallel and dipping toward the WNW. The shallow and deep aftershock alignments correspond to the fault plane of the mainshock and that of the largest aftershock (M6.4), respectively. The third alignment is almost perpendicular to the WNW-ward dipping planes and perhaps corresponds to the fault plane of the M6 aftershock on October 27. General feature of the obtained velocity structure is that the hanging wall (western part of the focal area) has lower velocity and the footwall (eastern part of the focal area) has higher velocity. Major velocity boundary seems to shift westward in comparison to in northern and southern parts at a location near the central part of the focal area, where the main shock rupture started. Some parts of the fault planes were imaged as low velocity zones. This complex crustal structure would be one of possible causes of the multi-fault rupture of the 2004 mid Niigata prefecture earthquake sequence.
- 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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SATO T.
Research Information Center, Institute of Plasma Physics, Nagoya University
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OKADA T.
Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, To
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Thurber C.
Department Of Geology And Geophysics University Of Wisconsin-madison
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Umino N.
Research Center For Prediction Of Earthquakes And Volcanic Eruptions Graduate School Of Science Toho
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Tsushima H.
Research Center For Prediction Of Earthquakes And Volcanic Eruptions Graduate School Of Science Toho
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NAKAJIMA J.
Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, To
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UCHIDA N.
Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, To
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NAKAYAMA T.
Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, To
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HORI S.
Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, To
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YABE Y.
Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, To
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SHIMIZU J.
Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, To
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KITA S.
Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, To
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YUI S.
Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, To
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HONDO S.
Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, To
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HASEGAWA A.
Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, To
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ASANO Y.
National Research Institute for Earth Science and Disaster Prevention
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Gamage S.
Research Center For Prediction Of Earthquakes And Volcanic Eruptions Graduate School Of Science Toho
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Suganomata J.
Research Center For Prediction Of Earthquakes And Volcanic Eruptions Graduate School Of Science Toho
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Matsuzawa T.
Research Center For Prediction Of Earthquakes And Volcanic Eruptions Graduate School Of Science Toho
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Yaginuma T.
Research Center For Prediction Of Earthquakes And Volcanic Eruptions Graduate School Of Science Toho
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Ariyoshi K.
Research Center For Prediction Of Earthquakes And Volcanic Eruptions Graduate School Of Science Toho
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Arao M.
Research Center For Prediction Of Earthquakes And Volcanic Eruptions Graduate School Of Science Toho
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Hirahara S.
Research Center For Prediction Of Earthquakes And Volcanic Eruptions Graduate School Of Science Toho
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Kono T.
Research Center For Prediction Of Earthquakes And Volcanic Eruptions Graduate School Of Science Toho
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Zhang H.
Department Of Anatomy Shimane Medical University
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Mizukami T.
Research Center For Prediction Of Earthquakes And Volcanic Eruptions Graduate School Of Science Tohoku University
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