山崎断層

山崎断層（やまさきだんそう）は、岡山県美作市（旧勝田町）から兵庫県三木市に至る活断層帯で、複数の断層によって構成されるため正確には山崎断層帯である[1]。

構成断層

那岐山断層帯、山崎断層帯主部、草谷断層の３つの起震断層に区分される。

那岐山断層帯
岡山県苫田郡鏡野町から岡山県勝田郡奈義町に至る長さ約32km、東西方向に延び、断層帯の北側が南側に対して相対的に隆起する断層帯[1]。
  • 声ヶ乢断層、那岐山断層、那岐池断層
山崎断層帯主部
岡山県美作市から兵庫県三木市に至る断層帯。ほぼ西北西−東南東方向に一連の断層が連なるように分布し長さは約79km。左横ずれが卓越する[1]。この一部である安富断層は中国自動車道福崎IC - 山崎IC間直下にあり、土万断層および琵琶甲断層も近接している[2]。
  • （山崎断層帯主部・北西部）大原断層、土万断層、安富断層、暮坂峠断層
  • （山崎断層帯主部・南東部）琵琶甲断層、三木断層
草谷断層
兵庫県三木市から兵庫県加古川市にかけて分布する断層。長さ約13km、東北東−西南西方向に延び、右横ずれが卓越する[1]。

地震

  • 868年に発生した播磨国地震の震源と推定されている[3][1][4]。
  • 周辺は1990年に上月町で発生した地震以降平穏であったが、2016年に入り小規模地震が相次いでいる[5]。

評価

  • 断層帯主部の左横ずれの平均変位速度は概ね1m/千年とされており、A級の活断層に分類される。
  • 2016年に地震本部から公表された30年以内の地震発生率は2～3パーセントで、やや高い部類に位置する。

対応

  • 2006年にJR西日本が姫路駅構内で行った脱線復旧訓練では、山崎断層を震源とする大規模地震が発生したとの想定の下、実施された。

出典

  1. ^ a b c d e 山崎断層帯 地震調査研究推進本部
  2. ^ 山崎断層帯地震発生時の緊急輸送路確保に関する取組 西日本高速道路
  3. ^ 岡田篤正、安藤雅孝、佃為成 (1987) : 山崎断層系安富断層のトレンチ調査 地学雑誌 96巻 (1987-1988) 2号 p.81-97, doi:10.5026/jgeography.96.2_81
  4. ^ “平安京跡から震災痕跡みつかる 仁和3年の南海トラフ地震で倒壊か”. 産経新聞. (2016年4月18日). https://www.sankei.com/article/20160418-4HV4ESMS3FJ4XDZO66S5EBAFUA/ 2016年4月18日閲覧。 
  5. ^ “兵庫県南西部を走る近畿最大断層帯で相次ぐ揺れ…大規模地震の予兆か？”. 毎日放送. (2016年3月16日). http://www.mbs.jp/voice/special/archive/20160316/ 2016年4月18日閲覧。 


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