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Report No.

Radiocarbon ages of tsunami deposits from the Lake Harutori along the Pacific coast of Hokkaido, northern Japan

Shigeno, Kiyoyuki*; Nakanishi, Toshimichi; Hong, W.*; Nanayama, Futoshi*

To estimate the sedimentary process of chronological samples in tsunami deposits, the radiocarbon ages of 10 pairs of marine shells and terrestrial plants were measured from one core obtained of lagoon lake sediments from the Lake Harutori in Kushiro City, eastern Hokkaido. This core of 12.6 meters length was obtained in the central part of the frozen lake in winter, which locates on a tectonic active region in the southwestern Kuril arc associated by the oblique subduction of the Pacific Plate under the Okhotsk. The radiocarbon ages from the tsunami deposits were more than 1000-4000 years older than the depositional curve constructed by previous radiocarbon ages and tephrochronology. It clearly suggests that these materials were reworked from older sediments by catastrophic tsunamis.



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