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Recently, some active faults have been approved for the first time in the area neighbouring the southern part of Kitakyushu City, Fukuoka Prefecture. All of them belong to a reverse fault or thrust ty...pe meaning the effect of lateral stress. One of them strikes in the direction of NNE-SSW, dipping 60°-70°westward. It forms a boundary between the coal-bearing Paleogene formation (Ideyama Formation) and its granitic basement, and dislocates the higher and middle terrace deposits lying over them. Radio-carbon date of the middle terrace deposits is 30,580±1,000y. B. P. The fault may be a right-handed one showing vertical slip of 2m+ and horizontal slip of 11m+. Others are seen in granite and between granite and metamorphic rock. They dislocate the middle terrace deposits but are not topographically manifested. The faults generally strike in the direction of NW-SE and dip 70°or more westerly. The fact that the active reverse faults are found in the Chikuho Coal-field should raise a new question in the existing conception of development of the Chikuho Coal-field and in the techniques of civil-engineering and construction.続きを見る
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Mendeley出力
