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For the purpose of testifying a generally accepted hypothesis in Japan, that is, crustal movements have continued in the Quaternary Period with the same mode and the same rate, marine terraces of Okushiri Island, which is located on the west of the Oshima Peninsula, Hokkaido (Fig. 1), were surveyed precisely, because it had been said that the Quaternary crustal movements of this island had changed in a mode by some researchers. The means of this investigation were to classify marine terraces, to measure altitudes of former shorelines of the terraces by an altimeter, and to infer the mode of crustal movements on the distribution of the altitudes obtained. The results are as follows. (1) There are three higher denudation surfaces of marine origin and six marine terraces, the 1st to 6th terraces in descending order (Fig. 3). (2) The altitudes of each former shoreline of the 3rd to 6th terraces are higher in the northwestern part of the island than in the southeast. The general strike of tilting is nearly ENE-WSW (Fig. 4, 5). The inclinations of tilting increase progressively from the younger terrace to the older one (Fig. 6). (3) The equations of interrelation between the altitudes of the 3rd and 4th terraces and those of the 4th and 5th terraces are: T3=1.40T4+1.65 (1) T4=1.04T5+34.4 (2)

Marine Terraces and Quaternary Crustal Movement of Okushiri Island on the West of Hokkaido