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- Title
Bombs behaving badly: unexpected trajectories and cooling of volcanic projectiles.
- Authors
Vanderkluysen, Loÿc; Harris, Andrew; Kelfoun, Karim; Bonadonna, Costanza; Ripepe, Maurizio
- Abstract
We collected thermal infrared video of two explosive eruptions at Stromboli in June 2008 and manually traced the trajectories of 95 particles launched during two eruptions. We found that 10-15 % of the analyzed trajectories deviated from predicted curves due to collisions, causing one particle to travel horizontally more than twice as far as expected. Furthermore, we observed an oscillatory cooling behavior for the airborne pyroclasts, with a median period of 0.46 s. Measured cooling was typically much faster than model-predicted cooling with discrepancies of up to 40 % between measured cooling and theoretical modeling. We interpret the measured cooling curves as resulting from the spinning and twisting and tearing of particles during travel: the periodic re-exposing of the hotter core of the pyroclasts to the atmosphere may cause the observed oscillations, and the spinning may accelerate cooling by enhancing convective heat transfer. Current volcanic trajectory and cooling models do not account for projectile collisions, spinning, or tearing and can thus severely underestimate the maximum landing distance and cooling rates of large pyroclasts.
- Subjects
ITALY; VOLCANISM; VOLCANOLOGY; VOLCANIC ash, tuff, etc.; BALLISTICS; HEAT transfer
- Publication
Bulletin of Volcanology, 2012, Vol 74, Issue 8, p1849
- ISSN
0258-8900
- Publication type
Article
- DOI
10.1007/s00445-012-0635-8