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Geological structure of the marginal plateau off Tottori, Southern-West of Honshu, Japan

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Abstract

A geological and geophysical survey off Tottori, southern-west of Honshu, Japan, was carried out by the Hydrographic Department of Japan during May and June (26 days) of 1974.

In the survey area, there is marginal plateau which lies under the slope of the continental shelf adjacent to the Sanin district. By the closely-spaced surveying the marginal plateau was divided into two different zones based on differences of genesis and structure, which are identified in this paper as marginal plateaus A (west side) and marginal plateau B (east side). The tectonic boundary between marginal plateaus A and B, previously believed to exist near Tottori City, was not confirmed. An erosional plane, beneath the horizontally bedded “upper layer” was found to be 75 m lower than the submerged surface of marginal plateau A. Marginal plateau B is hypothesized to have been generated by the sliding of the upper layer. This is suggested by the presence of prominent slumping directed toward the bottom of the Oki Trough. This result implies that the submergence of the Oki Trough area and formation of the marginal plateau are closely related.

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Katsura, T., Kitahara, S. Geological structure of the marginal plateau off Tottori, Southern-West of Honshu, Japan. Journal of the Oceanographical Society of Japan 33, 259–266 (1977). https://doi.org/10.1007/BF02109644

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  • DOI: https://doi.org/10.1007/BF02109644

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