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Title: 桜島火山におけるパーシベルによる降下火山灰の観測
Other Titles: PARSIVEL Tephra-fall Observations at Sakurajima Volcano
Authors: 小園, 誠史  KAKEN_name
三輪, 学央  KAKEN_name
眞木, 雅之  KAKEN_name
前坂, 剛  KAKEN_name
味喜, 大介  kyouindb  KAKEN_id
井口, 正人  kyouindb  KAKEN_id
Author's alias: KOZONO, Tomofumi
MIWA, Takahiro
MAKI, Masayuki
MAESAKA, Takeshi
MIKI, Daisuke
IGUCHI, Masato
Keywords: 降下火山灰
tephra fall
particle size distribution
Sakurajima volcano
Issue Date: Jun-2015
Publisher: 京都大学防災研究所
Journal title: 京都大学防災研究所年報. B
Volume: 58
Issue: B
Start page: 86
End page: 90
Abstract: The diameter and the fall velocity of tephra fall at Sakurajima volcano were measured on-site by a laser-optical Particle Size Velocity (PARSIVEL) disdrometer. Using the measured diameter and fall velocity, we obtained an empirical diameter-velocity relationship and a particle size distribution for tephra fall. The size distribution is explained by an exponential distribution as a first-order approximation. On the basis of high time resolution (each minute) measurements data, we found that both the diameter and the fall velocity of tephra fall systematically decrease with time. These results are useful for comparison with radar observations, and provide constraints on the dynamics of eruption column and tephra dispersion.
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