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Coastal geology and oceanography

By
Yoshiki Saito
Yoshiki Saito
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Ken Ikehara
Ken Ikehara
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Toru Tamura
Toru Tamura
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Published:
January 01, 2016

Abstract

The Japanese islands comprise 59%% mountains, 6% volcanoes and 35% hills and (mostly coastal) lowlands (Yonekura 2001). Quaternary strata excluding volcanoes occupy around 25% of the geological map of Japan, and constitute hills and lowland plains. Holocene strata are distributed mainly in the lowlands and occupy 13-15% of Japan (Murata Kano 1995; D. Kawabata 2013, pers. comm.). These extensive lowlands comprise four depositional environments, namely delta, fan delta, strand plain and barrier/estuary systems, all of which have been impacted by Holocene sea-level changes. Most of Holocene Japanese coastal plains record a hydro-isostatically controlled relatively stable to falling sea level over the last 6-7ka (Ota et al. 1981, 1987a, 1990; Nakada et al. 1991; Okuno et al. 2014). This hydro-isostatic effect varies spatially, being more strongly developed in the central rather than marginal parts of the islands (Yokoyama et al. 1996; Nakada et al. 1998; Nakada Okuno 2011; Okuno et al. 2014). Local tectonics have also strongly impacted relative sea levels since middle Holocene times, ranging from +30 m in the southern tip of the uplifting Boso Peninsula, SE of Tokyo, to-20 m in the subsiding Echigo Plain (Ota et al. 1987a, b; Shishikura 2001; Urabe et al. 2004; Tanabe et al. 2009).

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Geological Society, London, Geology of Series

The Geology of Japan

Teresa Moreno
Teresa Moreno
Institute of Environmental Assessment and Water Research (IDæA), Spanish National Research Council (CSIC), Barcelona, Spain
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Simon Wallis
Simon Wallis
Department of Earth and Planetary Sciences, Graduate School of Environmental Studies, Nagoya University, Japan
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Tomoko Kojima
Tomoko Kojima
Department of Earth and Environmental Sciences, Graduate School of Science and Technology, Kumamoto University, Japan
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Wes Gibbons
Wes Gibbons
WPS, 08870 Sitges, Barcelona, Spain
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Geological Society of London
ISBN electronic:
9781862397064
Publication date:
January 01, 2016

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