2016年熊本地震で甚大な被害を受けた益城町市街地の地下を構成する火山性堆積物の層序と分布形態  [in Japanese] Stratigraphy and distribution pattern of volcanogenic sediments beneath downtown Mashiki, Kumamoto, SW Japan, seriously damaged by the 2016 Kumamoto Earthquake  [in Japanese]

Access this Article

Search this Article

Author(s)

Abstract

<p>2016年熊本地震で甚大な建物被害が生じた益城町市街地付近の地下の地質層序,地層の分布形態を知るために,掘削調査で得られたコア試料等にみられる火山性堆積物の層相および層序を検討した.その結果,被害が大きかった台地縁辺斜面下半部の地下には,他地域に比べて阿蘇-4火砕流堆積物が厚く分布すること,そして表層には,地下水で飽和し,粘土化したラハール堆積物が分布することが明らかになった.</p>

<p>The 2016 Kumamoto Earthquake resulted in severe damage to houses and buildings, particularly in the central part of Mashiki Town, Kumamoto Prefecture, SW Japan. We examined drill core and standard penetration test (SPT) samples obtained from the severely damaged area to understand the influence of the underlying geology on damage caused by strong earthquake motion. The downtown Mashiki area is underlain by thick volcanogenic sediments derived from Aso volcano, comprising the Aso-3 pyroclastic flow, the Aso-4/3 interval, the Aso-4 pyroclastic flow, lahar, and loess deposits, in ascending order. The stratigraphic correlation of several boreholes in Mashiki Town reveals that the severely damaged area is characterized by a thicker fine-grained pumice bed of the Aso-4 pyroclastic flow and overlying weathered lahar deposits saturated with groundwater.</p>

Journal

  • The Journal of the Geological Society of Japan

    The Journal of the Geological Society of Japan 124(5), 347-359, 2018

    The Geological Society of Japan

Codes

  • NII Article ID (NAID)
    130007413114
  • NII NACSIS-CAT ID (NCID)
    AN00141768
  • Text Lang
    JPN
  • ISSN
    0016-7630
  • NDL Article ID
    029103334
  • NDL Call No.
    Z15-174
  • Data Source
    NDL  J-STAGE 
Page Top