松山-佐川間の水準路線に沿う地質調査

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In the Southwestern Japan, especially in Ki'i peninsula and in Shikoku Island, the regional land deformation took place associated with Nankai Great Earthquake of Dec., 21, 1946., The revision of levelling was performed by the Geographical Survey Beureau of the Constructional Ministry soon after the event., Some considerations on the land deformation has been offered by various authors in correlation with the geologic structure of Southwestern Japan., Such discussions must be preceded by the precise examination of the change of levelling at the geological standpoint., The writers carried out geological observation along the levelling route from Matsuyama to Sakawa throuth the highland Shikoku., The bench mark displacements are divided in two types., The one indicates remarkable downward displacement which are almost exclusively settled on the unstable foundation, such as the talus or loose surface soil, not directly on the basal rocks., This remarkable displacement may be ascribed to the mere local geologic condition of the surface deposit, representing no true crustal movement., The other indicates the general trend of the vertical displacement, tilting to southern direction of the crust or the partial manifestation of the downward warping of Shikoku Island in large scale with the axis of approximately EW-direction., The trend of the movement indicated by the algebraic sum of the change of height of the bench marks during 1939 to 1947 is quite opposite to that of the movement during from 1896 to 1939 in which no great earthquake was involved., Topographic feature of this region also indicates the upwarping of the region in the younger geologic age., No remarkable discontinuity is recognized in the geologic structure of the older strata.,
日本地質学会の論文
1950-08-20

松山-佐川間の水準路線に沿う地質調査

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