Skip to Main content Skip to Navigation
Journal articles

Fragmentation Processes During Strombolian Explosions Revealed Using Particle Size Distribution Mapping

Abstract : Fragmentation dynamics can be described by the size distribution of the fragments generated during an explosion. We approach the problem of magma fragmentation during a Strombolian explosion using the grain size distribution (GSD) of a ballistically emplaced lapilli-and-bomb deposit. We present a novel method of collecting juvenile fragments landing in a well-defined near-vent zone (around 50 m from the source). The method uses four plastic sheets (tarpaulins or tarps) deployed below the SW crater rim of Stromboli volcano (Aeolian Islands, Italy). Due to the vicinity of the collection site to the vent, the fragments were still hot when they landed and created a map of melt holes on the sheets. This map was processed to calculate cumulative fragment size distributions (FSD) and grain size distributions (GSD). The cumulative FSD (number based) and GSD (mass-based) are best described by unique power laws with fractal dimensions of 1.40 and 2.03, respectively, testifying to the fractal nature of fragmentation. The fractal dimension is consistent with low energy fragmentation of a brittle material. This method represents a new way of measuring fragmentation dynamics and classifying volcanic eruptions according to their fragmentation energy.
Document type :
Journal articles
Complete list of metadata

https://hal.uca.fr/hal-03071610
Contributor : Sylvaine Jouhannel Connect in order to contact the contributor
Submitted on : Wednesday, December 16, 2020 - 9:35:40 AM
Last modification on : Sunday, June 26, 2022 - 3:01:27 AM
Long-term archiving on: : Wednesday, March 17, 2021 - 6:28:24 PM

File

2020Colo'etalFrontiers.pdf
Publisher files allowed on an open archive

Licence


Distributed under a Creative Commons Attribution 4.0 International License

Identifiers

Collections

Citation

Colo Livia, Maurizio Ripepe, Lucia Gurioli, Andrew J L Harris. Fragmentation Processes During Strombolian Explosions Revealed Using Particle Size Distribution Mapping. Frontiers in Earth Science, Frontiers Media, 2020, 8, ⟨10.3389/feart.2020.00356⟩. ⟨hal-03071610⟩

Share

Metrics

Record views

41

Files downloads

55