The experiment on dating of the tsunami deposits using the luminescence method: A case study of samples from Nemuro coastal lowland, eastern Hokkaido

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  • ルミネッセンス法を用いた津波堆積物の年代測定の試み：北海道東部，根室沿岸低地の試料を例として
  • ルミネッセンスホウ オ モチイタ ツナミ タイセキブツ ノ ネンダイ ソクテイ ノ ココロミ ホッカイドウ トウブ ネムロ エンガン テイチ ノ シリョウ オ レイ ト シテ

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Abstract

Since 1998, an increasing number of studies have examined late Holocene tsunami deposits within marsh deposits along the Pacific coastal zone of eastern Hokkaido. These works have contributed to the establishment of a stratigraphy of large tsunami traces extending between the Tokachi coast and the Nemuro coastal lowland, using AMS 14C dating of carbonized materials and tephrochronology; however, to establish a more accurate stratigraphy, it is desirable to obtain depositional data directly from the tsunami deposits themselves. In October 2005, we performed a trench survey of large tsunami traces at Gakkarahama beach and Nanbuto marsh in the Nemuro coastal lowland, and collected 18 samples for luminescence dating from 12 tsunami deposits (NS1–NS12), and 3 regional tephra layers (B-Tm + Ma-b, Ta-c, and Ma-d) within a peat bed. In comparing the results of luminescence dating with tephrochronology and AMS 14C data, we identify six distinct tsunami deposits and two tephra layers. Other luminescence results, however, yield erroneously old ages or ages older than the tephrochronology and AMS 14C data. These older ages are considered to mainly reflect insufficient zeroing of luminescence during the tsunami run-up process.

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