西南日本における中新世前・中期の岩脈群と広域応力場

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タイトル別名
  • Early and Middle Miocene Dike Swarms and Regional Tectonic Stress Field in the Southwest Japan
  • セイナン ニホン ニ オケル チュウシンセイ マエ チュウキ ノ ガンミャクグ

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抄録

The preferred orientations of dike swarms of 12 areas that formed in the Early and Middle Miocene are investigated in order to know the azimuths of horizontal maximum compressional principal tectonic stress (σHmax) in the Southwest Japan. The most concentrated trends of dikes are parallel to the Southwest Japan Arc in each region to the north of the Butsuzo tectonic line and are perpendicular to that in each region to the south. Therefore, the directions of σHmax obtained from the preferred orientation of dike swarms are parallel to the Southwest Japan Arc on the northern side of the Butsuzo tectonic line and nearly perpendicular to it on the southern side, respectively. This results coincide with the directions obtained from the strike and the sense of motion of faults and folds formed in the same age.

収録刊行物

  • 火山.第２集

    火山.第２集 24 (4), 203-212, 1979

    特定非営利活動法人 日本火山学会

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