Physics
Scientific paper
Nov 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3822301v&link_type=abstract
Geophysical Research Letters, Volume 38, Issue 22, CiteID L22301
Physics
2
Volcanology: Eruption Mechanisms And Flow Emplacement, Volcanology: Volcano Monitoring (4302, 7280), Volcanology: Explosive Volcanism (4302), Volcanology: Remote Sensing Of Volcanoes (4337), Volcanology: Instruments And Techniques
Scientific paper
Small scale eruptive ash plumes at Arenal volcano (Costa Rica) were recorded using a ground-based Doppler radar (VOLDORAD). The time-velocity distribution of the mass load (i.e., Doppler radargrams) exhibits two contrasted dynamics recorded simultaneously, evidenced by distinctive velocities, life spans, and transit speeds through the radar beam. Synthetic Doppler radargrams computed with a simple ballistic model indicate that the short-lived signal is consistent with the instantaneous projection of ballistics blocks accompanying the ash plume emission. The mass of centimeter- to decimeter-sized ballistics is confidently estimated at 0.5-7 tons, whereas the ash plume mass is loosely constrained at 5.8 × 102 tons, assuming a particle diameter of 2 mm close to the vent. These quantitative estimates of the mass proportion either falling on the slopes of the volcano or ejected into the atmosphere could help in the modeling and monitoring of tephra dispersal.
Donnadieu Franck
Valade Sébastien
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