AN ESTIMATION OF SITE AMPLIFICATION BY IRREGULAR SUBSURFACE STRUCTURE NEAR KEGO FAULT FROM AFTERSHOCK RECORDS OF THE 2005 WEST OFF FUKUOKA PREFECTURE EARTHQUAKE

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  • MOTOKI Kentaro
    Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology
  • YAMANAKA Hiroaki
    Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology
  • SEO Kazuoh
    Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology
  • KAWASE Hiroshi
    Faculty of Human-Environment Studies, Kyushu Univ.

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  • 2005年福岡県西方沖の地震の余震観測に基づく警固断層周辺の不整形地盤による地盤増幅特性の評価
  • 2005ネン フクオカケン セイホウオキ ノ ジシン ノ ヨシン カンソク ニ モトヅク ケゴ ダンソウ シュウヘン ノ フセイケイ ジバン ニ ヨル ジバン ゾウフク トクセイ ノ ヒョウカ

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We conducted aftershock observations in Chuo Ward, Fukuoka city to make clear reasons why building damage had been concentrated near Kego Fault during the 2005 West off Fukuoka Prefecture earthquake. We found significantly large site amplification in the area limited within a distance of about 200 meters from Kego Fault to the northeast direction. Amplification factors in this area are evaluated to be about 3 times in PGA and PGV, and it corresponds to the increment of about 1 in seismic intensity. It can be interpreted that the amplification is affected by irregular shallow subsurface structure like basin edge effect.

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