1995年兵庫県南部地震による西宮・大阪地域の震害と地盤構造 Damage Caused by the 1995 Hyogo-ken Nanbu Earthquake and the Geologic Structure of Nishinomiya and the Osaka area

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著者

    • 三田村 宗樹 MITAMURA Muneki
    • 大阪市立大学理学部地球学教室 Osaka City University Investigation Team on the Hanshin Great Earthquake Disaster, Faculty of Science, Osaka City University
    • 中川 康一 NAKAGAWA Koichi
    • 大阪市立大学理学部地球学教室 Osaka City University Investigation Team on the Hanshin Great Earthquake Disaster, Faculty of Science, Osaka City University
    • 升本 眞二 [他] MASUMOTO Shinji
    • 大阪市立大学理学部地球学教室 Osaka City University Investigation Team on the Hanshin Great Earthquake Disaster, Faculty of Science, Osaka City University
    • 塩野 清治 SHIONO Kiyoji
    • 大阪市立大学理学部地球学教室 Osaka City University Investigation Team on the Hanshin Great Earthquake Disaster, Faculty of Science, Osaka City University
    • 吉川 周作 YOSHIKAWA Shusaku
    • 大阪市立大学理学部地球学教室 Osaka City University Investigation Team on the Hanshin Great Earthquake Disaster, Faculty of Science, Osaka City University
    • 古山 勝彦 FURUYAMA Katsuhiko
    • 大阪市立大学理学部地球学教室 Osaka City University Investigation Team on the Hanshin Great Earthquake Disaster, Faculty of Science, Osaka City University
    • 佐野 正人 SONO Masato
    • サンコーコンサルタント(株) Osaka City University Investigation Team on the Hanshin Great Earthquake Disaster, Faculty of Science, Osaka City University
    • 橋本 定樹 HASHIMOTO Sadaki
    • 関西大学第一高等学校 Osaka City University Investigation Team on the Hanshin Great Earthquake Disaster, Faculty of Science, Osaka City University
    • 領木 邦浩 RYOKI Kunihiro
    • 大阪職業能力開発短期大学校 Osaka City University Investigation Team on the Hanshin Great Earthquake Disaster, Faculty of Science, Osaka City University
    • 北田 奈緒子 KITADA Naoko
    • (財)大阪土質試験所 Osaka City University Investigation Team on the Hanshin Great Earthquake Disaster, Faculty of Science, Osaka City University
    • 井上 直人 INOUE Naoto
    • 大阪市立大学理学部地球学教室 Osaka City University Investigation Team on the Hanshin Great Earthquake Disaster, Faculty of Science, Osaka City University
    • 内山 高 UCHIYAMA Takashi
    • 大阪市立大学理学部地球学教室 Osaka City University Investigation Team on the Hanshin Great Earthquake Disaster, Faculty of Science, Osaka City University
    • 小西 省吾 KONISHI Shogo
    • 大阪市立大学理学部地球学教室 Osaka City University Investigation Team on the Hanshin Great Earthquake Disaster, Faculty of Science, Osaka City University
    • 宮川 ちひろ MIYAKAWA Chihiro
    • 大阪市立大学理学部地球学教室 Osaka City University Investigation Team on the Hanshin Great Earthquake Disaster, Faculty of Science, Osaka City University
    • 中村 正和 NAKAMURA Masakazu
    • 日さく Osaka City University Investigation Team on the Hanshin Great Earthquake Disaster, Faculty of Science, Osaka City University
    • 野口 和晃 NOGUCHI Kazuaki
    • 大阪市立大学理学部地球学教室 Osaka City University Investigation Team on the Hanshin Great Earthquake Disaster, Faculty of Science, Osaka City University
    • SURESH Shrestha
    • 大阪市立大学理学部地球学教室 Osaka City University Investigation Team on the Hanshin Great Earthquake Disaster, Faculty of Science, Osaka City University
    • 谷 保孝 TANI Yasutaka
    • 大阪市立大学理学部地球学教室 Osaka City University Investigation Team on the Hanshin Great Earthquake Disaster, Faculty of Science, Osaka City University
    • 山口 貴行 YAMAGUCHI Takayuki
    • 大阪市立大学理学部地球学教室 Osaka City University Investigation Team on the Hanshin Great Earthquake Disaster, Faculty of Science, Osaka City University
    • 山本 裕雄 YAMAMOTO Yasuo
    • 大阪市立大学理学部地球学教室 Osaka City University Investigation Team on the Hanshin Great Earthquake Disaster, Faculty of Science, Osaka City University

抄録

1995年兵庫県南部地震は,阪神地域に甚大な被害を生じさせた.阪神地域は都市化の進んだ場所で,人工的な地形改変が多くの場所で行われている.しかし,現在の地形図上では,その箇所が不明確であるため,過去の地形図との比較から人工改変地形の抽出を行ったうえで被害分布との関連を西宮・大阪地域について検討した.大阪地域では,基盤断層の落下側に被害が集中する傾向があり,基盤構造との関連性が存在することを指摘した.これについては,既存地下地質資料をもとにした地震波線トレースのシミュレーションの結果から,地震波のフォーカシング現象がかかわっているとみている.結論として,日本の大都市の立地する地盤環境は類似し,地震災害に関して堆積盆地内の厚い第四紀層での地震動増幅,伏在断層付近でのフォーカシング,盆地内の表面波の重複反射よる長時間震動継続,表層の人工地盤や緩い未固結層の液状化など共通した特性を有していることを指摘した.

The 1995 Hyogo-ken Nanbu Earthquake caused serious damage in the Hanshin and Awaji areas. Ground failures, such as liquefaction and gravity slides widely occurred in coastal zones and inland areas. Many of these areas include man-made land.<br>The areas that sustained the most serious liquefaction damage were reclaimed lands along the margin of the Osaka Bay, including Port-Island and Rokko-Island. Comparison between old and new topographical maps shows that wide areas damaged by liquefaction correspond to man-made land reclaimed since the Edo Era (about 1680). In particular, land reclaimed since 1945 under-went major subsidence settling up to about 50cm.<br>In the inland parts of Nishinomiya City and the surrounding area, some sites of liquefaction, lateral spreading, and ground subsidence damage were confirmed. These sites are recent alluvial valleys and man-made lands created by reclaiming irrigation ponds. Many public and educational institutions are built on reclaimed ponds. Many of these buildings which are specified as places of refuge at times of disaster were damaged and did not serve their purpose.<br>Some slopes on hilly lands collapsed under this earthquake's shock and gravity. Many of these slope failures occurred in residential areas built on filled alluvial valleys. At Nikawa-yurino-cho Town in Nishinomiya City, a big slope failure occurred behind the residential area and killed 34 people. This man-made slope has about a 20°dip. The natural terrace cliffs and slopes of granitic rocks around this area are steeper than this slope, but this slope was the weakest one in the earthquake. These man-made lands, like coastal reclaimed land, are filled with loose sandy materials and have a high ground water table.<br>The Osaka area, including Amagasaki, Itami, Toyonaka, Osaka, and Sakai cities and located 30 to 50km east of the epicenter, was widely damaged by liquefaction and the intense ground motion. Liquefaction damage in the inland area occurred along the old river channel. The old channels were also filled up with loose materials and have a high ground water table due to permeation of surface water.<br>Damage to houses in the Osaka area was concentrated along the margin of the basin divided by faults. In the uplifted side area, damage was slight. This distribution of damage suggests that the seismic waves were amplified and focused by the Quaternary layer and its geologic structure in the Osaka Plain.

収録刊行物

  • 第四紀研究  

    第四紀研究 35(3), 179-188, 1996-07-31 

    Japan Association for Quaternary Research

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各種コード

  • NII論文ID(NAID)
    10002633764
  • NII書誌ID(NCID)
    AN0034136X
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    04182642
  • NDL 記事登録ID
    4019529
  • NDL 雑誌分類
    ZM49(科学技術--地球科学--地質)
  • NDL 請求記号
    Z15-67
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