BULLETIN OF THE GEOLOGICAL SURVEY OF JAPAN
Online ISSN : 2186-490X
Print ISSN : 1346-4272
ISSN-L : 1346-4272
Volume 65 , Issue 5-6
Bulletin of the Geological Survey of Japan
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  • Takeyuki Ueki
    2014 Volume 65 Issue 5-6 Pages 67-70
    Published: November 12, 2014
    Released: February 06, 2015
    JOURNALS FREE ACCESS
    The debris flow deposits buries the valley of Sono River, in the Nagashima area of Mie Prefecture, southwest Japan. The AMS 14C age of ca. 3,100 yrs BP was extracted from the pseudo-clast of humic soil in the uppermost horizon of debris flow deposits, suggesting that the timing of debris flow is 3,100 to 1,000 yrs BP.
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  • Rie Morijiri, Mitsuru Nakagawa
    2014 Volume 65 Issue 5-6 Pages 71-84
    Published: November 12, 2014
    Released: February 06, 2015
    JOURNALS FREE ACCESS
    A simple structural model explaining the gravity and magnetic anomalies was proposed along 2 profiles across the Pacific coast of the eastern Hokkaido (from Kushiro to Nemuro Peninsula). Recently, gravity and magnetic anomaly maps of offshore of this area were published. This area is characterized by high gravity and high magnetic anomalies. From the distribution of Nemuro formation, it was difficult to account for the source of highly positive gravity anomaly belt along the Nemuro Peninsula. Dolerites which compose a part of Nemuro formation were collected in this area. These samples have high density, susceptibility and strong NRM. Curie temperatures and Verwey transition indicate that magnetic carrier is mainly magnetite. Our 2-D modeling referred to these rock density and magnetic data. The result of it revealed that (1) the high gravity anomaly belt along Nemuro Peninsula was attributed to shallow dolerite bodies, and (2) high magnetic anomaly belts of offshore Kushiro was presumably caused by serpentinite.
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