降水レーダを用いた雲仙岳火砕流に伴う噴煙の構造の時間変化に関する事例解析

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書誌事項

タイトル別名
  • A Case Study of Structure and Evolution of the Ash Cloud Derived from Unzen Pyroclastic Flow Using Radar Data
  • コウスイ レーダ オ モチイタ ウンゼンダケ カサイリュウ ニ トモナウ フン

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抄録

Stmruture and evolution of the ash cloud derived from Unzen pyroclastic flow at 18:23, May 21. 1993 was studied using a weather-radar data. The following results were obtained. 1. The vertical motion in the ash cloud was not uniform. When downward motion dominated in the northern part of the ash cloud, upward motion was inferred in the southern part of the ash cloud. 2. Maximum echo intensity was observed at 2.5 km throughout analysis period. The ejected mass of volcanic-ash particles estimated from radar data reached the maximum 30 minuets after the occurrence of the pyroclastic flow. It was considered that some volcanic ashes were coated with water in cloud layer and aggregate growth of volcanic ashes were occurred in the ash cloud.

収録刊行物

  • 火山

    火山 41 (4), 149-158, 1996

    特定非営利活動法人 日本火山学会

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