関東地方における第四紀地殻変動

概要

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The tectonic pattern of the Quaternary crustal movements in the Kanto Region was created through the diastrophism named 'Kurotaki phase' in the earliest Pliocene. Since then the region was divided into three tectonic provinces; the tectonic basin of Kanto, the upheaval zone of Mineoka-Hayama, and the geosynclinal zone of Tateyama-Oiso. The tectonic history in each province during the Quaternary time are summarized based upon the tectonic maps (Fig. 2, 4, and 5) of several stages. The rate of crustal movement (Tab. 1) calculated by the thickness of the sedimentaries or amount of the vertical displacement of the geomorphological plains of known age indicates that the crustal movements of the region have accelerated towards the Quaternary since the Miocene time. Thick Neogene to early Pleistocene formations of the Tateyama zone were folded and uplifted by early Pleistocene time and the upheaval of the area has continued to the present time. Seismicity in relation to the crustal movements of the region is mentioned briefly.
日本地質学会の論文