Thickness and Grain-size Distribution of the Osumi Pumice Fall Deposit from the Aira Caldera

DOI 6 Citations

Bibliographic Information

Other Title
  • 姶良カルデラ大隅降下軽石堆積物の層厚・粒度分布
  • 姶良カルデラ大隅降下軽石堆積物の層厚・粒度分布〔英文〕
  • アイラ カルデラ オオスミ コウカ カルイシ タイセキブツ ノ ソウアツ リュ

Search this article

Abstract

The Osumi pumice fall deposit is the product of a large-scale Plinian eruption which started a series of gigantic pyroclastic eruptions culminating in the formation of the Aira caldera. The deposit consists of gray-white pumice fragments, isolated phenocrysts and a small amount of lithic fragments derived from the basement. Generally it is homogeneous with a moderate reverse grading, with finer layers near the bottom. Maps of isopachs and isopleths of average maximum diameters of pumice and lithic fragments and of median diameter all indicate that the vent was located at or near the present site of Sakurajima volcano, a post-caldera cone located on the southern rim of the caldera. The dispersal axis runs N120°E from the vent with a fairly large apex angle of the envelope. Extrapolation after WALKER’S method (1980, 1981) on log-thickness vs log-area plot gives an estimated volume of 98 km^3, second only to the Shikotsu-1 pumice fall among the known Plinian deposits.

Journal

Citations (6)*help

See more

Details

  • CRID
    1390001206123916800
  • NII Article ID
    110002992164
  • NII Book ID
    AN10512786
  • ISSN
    04534360
    24330590
  • DOI
    10.18940/kazanc.28.2_129
  • NDL BIB ID
    2597557
  • Text Lang
    en
  • Data Source
    • JaLC
    • NDL
    • CiNii Articles
  • Abstract License Flag
    Disallowed

Report a problem

Back to top