谷地地すべり-とくに岩盤地すべりと地質的背景-

概要

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The landslide of Yachi, which occurred on the southeastern part of Akita prefecture, is a typical of rockslide.The cause of this landslide is essentially due to the geological background, especially to the lithology and geological structure of the Tertiary strata mostly covering this area. The strata are composed of lithologically different two kinds of rock species, namely the so-called "hard shale" and its intercalations of tuff. Based on physical and mechanical tests in laboratory, the landslide surface is inferred to have been formed at the altered tuff bed being visce-ductile in nature.In addition to this condition, the geological structure, which basically consists of the Narusegawa fault and a synclinorium of the Tertiary strata, might play an important role to develope the landslide of Yachi into the large scale rock-slide.
公益社団法人日本地すべり学会の論文