The locations of magma chambers at Mt. Etna, Italy, mapped by b-values

Details The locations of magma chambers at Mt. Etna, Italy, mapped by b-values The locations of magma chambers at Mt. Etna, Italy, mapped by b-values

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.2553m&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 16, p. 2553-2556

Other

34

Seismology: Volcano Seismology

Scientific paper

We mapped b-values in three dimensions in a cube of the crust with approximately 20 km dimensions under Mt. Etna. The earthquake catalog used contains 450 events with M>=2.5 for 1990-1997.9. Comparison of b-values derived from samples of N=50 events, extracted from volumes with radii ranging from 2.5 to 6 km, showed statistically highly significant differences between b=1.5+/-0.3 in most of the crust and b=3.0+/-0.5 in two volumes with r<=5km, one located 2 km E of the summit of Etna and at 10+/-3km depth and the other one WSW of Etna at a depth of about 3+/-2km below sea level. We interpret these high b-value anomalies as an expression of two active magma chambers at those locations.

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