Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3324316n&link_type=abstract
Geophysical Research Letters, Volume 33, Issue 24, CiteID L24316
Physics
17
Seismology: Volcano Seismology (8419), Structural Geology: Role Of Fluids, Volcanology: Volcano Monitoring (7280), Volcanology: Remote Sensing Of Volcanoes, Volcanology: Instruments And Techniques
Scientific paper
Continuous soil radon monitoring was carried out near the Southeast Crater (SEC) of Mt. Etna during the 10-day July 2006 Strombolian-effusive eruption. This signal was compared with simultaneously acquired volcanic tremor and thermal radiance data. The onset of explosive activity and a lava fountaining episode were preceded by some hours with increases in radon soil emission by 4-5 orders of magnitude, which we interpret as precursors. Minor changes in eruptive behavior did not produce significant variations in the monitored parameters. The remarkably high radon concentrations we observed are unprecedented in the literature. We interpret peaks in radon activity as due primarily to microfracturing of uranium-bearing rock. These observations suggest that radon measurements in the summit area of Etna are strongly controlled by the state of stress within the volcano and demonstrate the usefulness of radon data acquisition before and during eruptions.
Behncke Boris
Burton Marcia
Galli Giulia
Giammanco Salvatore
Neri Marco
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