In-conduit capture of sub-micron volcanic ash particles via turbophoresis and sintering
- Farquharson, Jamie I.
- Tuffen, Hugh
- Wadsworth, Fabian B.
- Castro, Jonathan M.
- Unwin, Holly
- Schipper, C. Ian
DOIAbstract
Ash emission in explosive silicic eruptions can have widespread impacts for human health, agriculture, infrastructure, and aviation. Estimates of the total grainsize distribution (TGSD) generated during explosive magma fragmentation underpins eruption models and ash dispersal forecasts. Conventionally, the TGSD constrained via erupted deposits is assumed to match the TGSD produced at explosive fragmentation. Here we present observations from within the vent of a recent rhyolitic eruption (Cordón Caulle, Chile, 2011–2012), demonstrating that fine (<63 μm diameter) and ultra-fine (<2.5 μm diameter) ash particles are captured and sintered to fracture surfaces, and thus sequestered in the shallow subsurface, rather than emitted. We establish a ...
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