Ash fall hazard maps for a large-scale eruption of Sakurajima volcano considering daily wind fields over a one-year period

DOI

Bibliographic Information

Other Title
  • 1年間にわたる風速場を考慮した桜島大規模噴火に対する降灰ハザードマップの作成

Abstract

This study presents ash-fall hazard maps for an eruption of Sakurajima volcano of similar scale to the Taisho eruption based on tephra transport simulations accounting for daily variations in wind fields over a 1-year period. Existing hazard maps indicate deposition of ash on the eastern side of Sakurajima by westerly winds, which reflects the mean annual wind direction. This study analyzed ash deposition by implementing daily-base computations with no prior statistical processing. The results reveal that the maximum-class deposits occur around Kagoshima Chuo Station focused in August, when the wind direction is not annually predominant one. The resultant hazard map based on the maximum thickness of the deposits differs from existing maps and provides useful information for creating disaster evacuation plans. Further hazard maps are proposed based on the frequency of the ash-fall exceeding a particular thickness and on a highest 1% deposit thickness, and we discuss suitable methods of expressing ways responding to the users’ class and object.

Journal

Keywords

Details 詳細情報について

  • CRID
    1390010292808615168
  • DOI
    10.24762/jndsj.40.s08_175
  • ISSN
    24341037
    02866021
  • Text Lang
    ja
  • Data Source
    • JaLC
  • Abstract License Flag
    Disallowed

Report a problem

Back to top