ArticleScientific reports2025
In flight fragmentation reduces bomb size range and hazard during explosive volcanic eruptions.
Article in Scientific reports, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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Who cites it
1 citing paper in PubMed.
- Tephra fall probabilistic hazard maps for VEI 3 and VEI 4 eruptions at Mt. Garibaldi (Journal of applied volcanology · 2026Article
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Authors and funding
10 authors.
Funding
Abstract
Coarse, molten fragments of low-viscosity magma (volcanic bombs) that are ejected during explosive volcanic eruptions represent a source of hazard and a record of past eruptions. After ejection, bombs tend to break up during flight, but how much this affects their dispersal is unclear. Here, we use high-speed and high-definition imaging of three recent explosive eruptions to parameterise the in-flight fragmentation of bombs. We estimate that in-flight fragmentation involves 73% of bombs coarser than ∼ 0.2 m, with bomb-to-bomb collisions and aerodynamic frictional (drag) forces being the main drivers of in-flight fragmentation, depending on eruption style. Drag force increases with increasing bomb velocity and size, selectively fragmenting the coarsest and fastest bombs, acting as a self-limiting factor for the range and energy of falling bombs. These findings pose a quantitative basis for incorporating the in-flight fragmentation processes into the interpretation of volcanic deposits and for modelling hazards from falling bombs.
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