Faults and their Stress Fields at the Otake-Hatchobaru Geothermal Area

Masao Hayashi, Koichiro Watanabe, Naoyuki Furutani

研究成果: ジャーナルへの寄稿記事

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The strike and dip of fractures such as slickensides, hydrothermal veins and joints, found in drillcores from the Otake-Hatchobaru geothermal area have been estimated after measuring the thermoremant magnetism of the cores with an astatic magnetmeter. The results show that most of the slickensides and veins dip southward, though their strikes vary considerably from NW-SE to NE-SW. In addition, the analysis of slickensides has revealed that the NW-SE trending faults basically are of left-handed strike slip type, while the NE-SW ones are of light-handed one. It is inferred that both kinds of faults were originally formed by the ENE-WSW compressional stress fields whose minimum stress axis dip NNW with moderate angles. Recently, the normal stress fields, whose intermediate stress axis tends NW-SE, have probably made the NW-SE trending fault planes open and permeable so that they have become the present breeding faults.

元の言語英語
ページ(範囲)383-399
ページ数17
ジャーナルjournal of the geothermal research society of japan
7
発行部数4
DOI
出版物ステータス出版済み - 1 1 1985

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All Science Journal Classification (ASJC) codes

  • Geophysics

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