Holocene beach deposits for assessing coastal uplift of the northeastern Boso Peninsula, Pacific coast of Japan

This paper presents a case study that assessed spatial variations in the tectonic uplift rates of beach deposits in the relict Kujukuri strand plain, situated on the northeastern coast of the Boso Peninsula, eastern Japan. The southern Boso Peninsula is tilted downward to the northeast due to plate...

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Bibliographic Details
Published in:Quaternary research 2010-09, Vol.74 (2), p.227-234
Main Authors: Tamura, Toru, Murakami, Fumitoshi, Watanabe, Kazuaki
Format: Article
Language:English
Subjects:
Beach
Beaches
Coastlines
Coring
Deposition
Earthquake
Elevation
Ground-penetrating radar
Japan Trench
Marine
Marine terrace
Peninsulas
Philippine Sea plate
Sagami Trough
Sea level
Strands
Tectonics
Terraces
Western Pacific
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Summary:This paper presents a case study that assessed spatial variations in the tectonic uplift rates of beach deposits in the relict Kujukuri strand plain, situated on the northeastern coast of the Boso Peninsula, eastern Japan. The southern Boso Peninsula is tilted downward to the northeast due to plate subduction along the Sagami Trough. However, the cause of the northeastern coast uplift creating the relict strand plain is unclear, due to the absence of a Holocene raised marine terrace sequence. Elevations and ages of beach deposits were collected from drilled cores and ground-penetrating radar profiles along three shore-normal sections in the southern Kujukuri strand plain. From this, alongshore variations in the relative sea level since the mid-Holocene could be seen. These corresponded to north-to-northeast downward tilting at a rate of 0.4 m/ka for an interval 10 km and are concordant with the longer term tilting of the last interglacial marine terrace surrounding the plain. Although it is difficult to assess shore-normal variations of uplift based on the present dataset, the recognized tilting apparently continues to the tilting of the southern Boso Peninsula, implying the Sagami Trough probably affects the uplift of the Kujukuri coast.
ISSN:0033-5894
1096-0287
DOI:10.1016/j.yqres.2010.07.009