Abstract
The Kanehanatoge slide in September 1972 took place in the lower part of an ancient slide morphology. The ancient and recent slides were a so-called detritus and clayey soil slide and a so-called clayey soil slide, respectively. Their slide clays are composed principally of large amounts of montmorillonite, which were derived probably from a hydrothermally argillized zone, that is, a veined montmorillonite-kaolinite zone along the joint planes in rhyolite lava (bedrock) of the Upper Miocene Ikutahara Formation . It is suggested, therefore, that the slides related very well to modes of occurrence and properties of hydrothermal alteration zones in the vicinity of the slide area.
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