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Acoustic sounder measurements of the vertical velocity of volcanic jets at Stromboli Volcano
Author(s) -
Weill Alain,
Brandeis Geneviève,
Vergniolle Sylvie,
Baudin François,
Bilbille Jacques,
Fèvre JeanFrançois,
Piron Brigitte,
Hill Xavier
Publication year - 1992
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/92gl02502
Subject(s) - volcano , lava , geology , seismology , jet (fluid) , doppler effect , geophysics , aerospace engineering , physics , astronomy , engineering
We have used a Sodar (acoustic doppler sounder) to characterize the behavior of volcanoes, and in particular, to measure the vertical velocities of volcanic jets. We have analyzed more than 100 explosions on Stromboli volcano (Eolian islands). First results show vertical speeds close to the vent ranging from 20 m/s to 80 m/s. The uncertainty in the measurements is close to 10 %, due mainly to the inaccurate knowledge of the sound speed in volcanic jets. This is small, compared to other volcanological methods. This method is well suited for monitoring temporal variations during an eruption and should be particularly interesting for the study of the eruptive dynamics of lava fountains. The Doppler spectrum in explosions appears to be related to different types of echoes and contains information on particle sizes in the jet.