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断層活動が地質環境に与える影響調査(3)

Study on the Geological Environment Influenced by Fault Movement(III)

新宮 和喜*; 佐藤 英太郎*; 阿達 一宏*; 工藤 昌克*; 石塚 善章*; 堀之口 賢治*; 中嶋 敏秀*

Shingu, Kazuki*; Sato, Eitaro*; Adachi, Kazuhiro*; Kudo, Masakatsu*; Ishizuka, Yoshiaki*; Horinokuchi, Kenji*; Nakajima, Toshihide*

本調査は,地層科学の一環として,断層活動が周辺の地質環境に与える影響を調査し,地質環境の長期安定性の評価に資することを目的としている。本年度行った調査は,既存の空中写真を使って地形解析調査を行った。次に,平成4年度に実施した茂住祐延断層近傍に開削された長棟地域構造坑道内の試錐孔において,孔内試験を実施した。まず,長棟No.1孔において,S-200による応力測定を実施し,応力の経時変化を追跡した。次に長棟No.3孔において,比較的岩質の良い箇所を選択し,そこでS-200による応力計測を実施した。

The objective of this study is to prove the long-term geoscientific stability of the geological environment. The survey will clarify the extent and degree of mechanical change influenced by fault movement deep underground as well as the surface. The study was conducted in Mozumi of the Kamioka mining district, located in the Atotsu active fault system zone. This year, a study was carried out by measuring stress state and rock properties around the active fault. At first, stress measurement by double fracturing was conducted at Nagato No.1 borehole in order to compare a newly measured stress state with the one done last year. The difference between them was very little. Secondly, the first stress measurement was carried out on the Nagato No.3 borehole.

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