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敦賀半島北西部における花崗岩の割れ目の特徴

Features of granite cracks in the northwestern part of the Tsuruga peninsula

照沢 秀司; 島田 耕史  

Terusawa, Shuji; Shimada, Koji

花崗岩中の割れ目の方向には定向性がある場合があり、直線的な谷などの地形として表れる。また、卓越する方向から広域的な応力場を推定する試みも行われている。本講演では、敦賀半島北西部に立地する高速増殖原型炉もんじゅ敷地内・敷地近傍において平成19年度から28年度に行われた地質調査結果をコンパイルし、広域的に卓越する割れ目の方向の抽出を行った。その結果、調査地域北東部では、北北東-南南西方向および西北西-東南東方向、南西部では、北東-南西方向および北西-南東方向であった。挟角は北東部で約60-80$$^{circ}$$、南西部で約90$$^{circ}$$で、いずれもの地域でも傾斜は60-80$$^{circ}$$の高角を示した。この北東部と南西部における卓越方向の違いについては、特に挟角が約60-80$$^{circ}$$の北東部では、共役性のせん断節理の可能性があり、個々の節理の微小な変位の有無に着目した調査や、より広域の調査により解明できる可能性がある。

The direction of the crack in the granite may have directionality, and it appears as a topography such as a linear valley. Attempts have been made to estimate stress field from the predominant direction. We compiled the results of geological survey which was conducted near the Monju cite in 2007 to 2015, and extract the predominant direction of cracks. As a result, in the northeastern area of the survey area, the north northeast and the west northwest direction were predominant, in the southwest, the northeast and the northwest direction were predominant. The included angle was about 60 to 80 degrees in the northeastern area and about 90 degrees in the southwestern area, and the dip angle was 60 to 80 degrees in both areas. The differences in the predominant direction in the northeastern part and the southwest part may proved by surveys which focusing on the presence or absence of minute displacement of individual joints, more extensive survey.

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