地形·地質·物理探査データに基づく2018年大阪府北部の地震の震源域周辺の活構造の再検討

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  • 堤 浩之
    同志社大学理工学部環境システム学科
  • 飯尾 能久
    京都大学防災研究所地震予知研究センター

書誌事項

タイトル別名
  • Reevaluation of Active Geologic Structures in the Epicentral Area of the 2018 Northern Osaka Prefecture Earthquake Based on Geomorphological, Geological and Geophysical Exploration Data
  • 地形・地質・物理探査データに基づく2018年大阪府北部の地震の震源域周辺の活構造の再検討
  • チケイ ・ チシツ ・ ブツリ タンサ データ ニ モトズク 2018ネン オオサカフ ホクブ ノ ジシン ノ シンゲンイキ シュウヘン ノ カツコウゾウ ノ サイケントウ

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抄録

<p>The 2018 northern Osaka Prefecture earthquake (Mj 6.1) was caused by ruptures of blind strike-slip and reverse faults. The earthquake was moderate in size but caused severe damages to the northeastern part of the densely populated Osaka metropolitan area. The epicentral area is located at a junction of east-trending strike-slip faults and north-trending reverse faults. In order to better understand the geologic setting of the earthquake, we conducted an integrated analysis of published seismic reflection profiles and gravity basement structure map together with geomorphic and geologic data. We interpreted that the Arima-Takatsuki Tectonic Line fault zone extends about 9 km further to the east of the geomorphologically mapped surface trace. We also found that the Hirakata flexure extends northeast beneath the Yodo River as a southeast-dipping reverse fault. The area bounded by the Arima-Takatsuki Tectonic Line fault zone and northeast extension of the Hirakata flexure is a northeast-trending graben which we call here as the Yodogawa graben. The 2018 earthquake occurred beneath the graben but the ruptured faults do not offset gravity basement. The identification of the previously unknown active faults warrants further geological and geophysical studies of the faults in this highly urbanized area of the Osaka Plain.</p>

収録刊行物

  • 地震　第２輯

    地震　第２輯 72 (0), 57-67, 2019-10-04

    公益社団法人 日本地震学会

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