Mapping of the b value anomalies beneath Mt. Etna, Italy, during July-August 2001 lateral eruption

Details Mapping of the b value anomalies beneath Mt. Etna, Italy, during July-August 2001 lateral eruption Mapping of the b value anomalies beneath Mt. Etna, Italy, during July-August 2001 lateral eruption

Mar 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3205309m&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 5, CiteID L05309

Physics

4

Seismology: Volcano Seismology (8419), Tectonophysics: Tomography (6982, 7270), Volcanology: Magma Migration And Fragmentation

Scientific paper

The pattern of b value of the frequency-magnitude relation, or mean magnitude, has been analyzed as function of space beneath Mt. Etna during the intense lateral eruption of July-August 2001. The data used (August 1999-August 2001), subdivided in the pre-eruptive and eruption period, show significant space variations in the b value. For each of the two periods, a volume of anomalously high b value can be observed in the southeastern flank of the volcano. The anomalies located at 3 +/- 1 km (b = 1.84 +/- 0.20), and at about 1 +/- 1 km (b = 2.11 +/- 0.29) depth are interpreted as two different steps of a magma migration process ended with the July-August 2001 eruption. All the available geophysical evidences such as geodetic deformation measurements, focal mechanism and tomographic studies support this interpretation.

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