宮城県北部地震による地盤変動

概要

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A locally severe earthquake occurred in the northern part of Miyagi Prefecture (φ = 38°.7N, λ = 141°.1E) on April 30th, 1962. Its magnitude was 6.4 (Gutenberg-Richter's scale) and the area of damage extended 20 km in radius. The writers carried out the resurvey of the first order levelling to estimate the land deformation near the epicentral area along the route of bench marks from Furukawa to Kannari, about 40 km in length. (Fig. 1) The results of the levelling resurvey are shown in Table 1, and Table 2 shows the relative vertical displacement of the bench marks along the route B.M. Nos. 5436-5419. (B.M. No. 5436 is assumed to be fixed) Excepting the subsidence at the two points in the north of Tukidate town (B.M. Nos. 5431 and 5432), where the ground is very soft owing to alluvial deposit, we can find some tendency of upheaval near the epicentral area. Upheavals of such type have often been observed in the epicentral area in the case of a destructive inland earthquake in Japan.
1962-11-30