Scientific article
Open access

Aerodynamic characteristics and genesis of aggregates at Sakurajima Volcano, Japan

Published inScientific reports, vol. 12, no. 1, 2044
Publication date2022-02-07
First online date2022-02-07

Aggregation of volcanic ash is known to significantly impact sedimentation from volcanic plumes. The study of particle aggregates during tephra fallout is crucial to increase our understanding of both ash aggregation and sedimentation. In this work, we describe key features of ash aggregates and ash sedimentation associated with eleven Vulcanian explosions at Sakurajima Volcano (Japan) based on state-of-the-art sampling techniques. We identified five types of aggregates of both Particle Cluster (PC) and Accretionary Pellet (AP) categories. In particular, we found that PCs and the first and third type of APs can coexist within the same eruption in rainy conditions. We also found that the aerodynamic properties of aggregates (e.g., terminal velocity and density) depend on their type. In addition, grainsize analysis revealed that characteristics of the grainsize distributions (GSDs) of tephra samples correlate with the typology of the aggregates identified. In fact, bimodal GSDs correlate with the presence of cored clusters (PC3) and liquid pellets (AP3), while unimodal GSDs correlate either with the occurrence of ash clusters (PC1) or with the large particles (coarse ash) coated by fine ash (PC2).

  • Volcanic ash
  • Aggregation
  • Vulcanian
  • Sakurajima
Citation (ISO format)
DIAZ VECINO, Maria Carolina et al. Aerodynamic characteristics and genesis of aggregates at Sakurajima Volcano, Japan. In: Scientific reports, 2022, vol. 12, n° 1, p. 2044. doi: 10.1038/s41598-022-05854-z
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Article (Published version)
ISSN of the journal2045-2322

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