BULLETIN OF THE GEOLOGICAL SURVEY OF JAPAN
Online ISSN : 2186-490X
Print ISSN : 1346-4272
ISSN-L : 1346-4272
Volume 65 , Issue 7-8
Bulletin of the Geological Survey of Japan
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Article
  • Junko Komatsubara
    2014 Volume 65 Issue 7-8 Pages 85-95
    Published: November 19, 2014
    Released: February 06, 2015
    JOURNALS FREE ACCESS
    The basal topography of the latest Pleistocene to Holocene incised valley fills under the Arakawa Lowland, Kanto Plain, central Japan is revealed based on 2580 borehole log data. The base of the valley fills in each borehole log is identified based on soil properties and comparison with the data of all-core sampling surveys. These point data composed of longitude, latitude and elevation of valley fill base are interpolated to describe the basal topography by the inverse distance weighting method. The basal map shows a detailed topography of the paleovalley, including buried wave-cut benches and buried terrace planes. The gradient of the paleovalley floor is approximately 1/1000, which is almost the same as that of the neighboring Nakagawa lowland. In some places around the Omiya upland, it would be very difficult to differentiate the Holocene valley fills from Pleistocene strata with similar properties.
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