Physics
Scientific paper
Nov 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3221309m&link_type=abstract
Geophysical Research Letters, Volume 32, Issue 21, CiteID L21309
Physics
7
Seismology: Tomography (6982, 8180), Seismology: Volcano Seismology (8419), Volcanology: Eruption Mechanisms And Flow Emplacement
Scientific paper
We have analyzed 291 shallow seismic events, leading to the July 17-August 9, 2001 flank eruption at Mt. Etna volcano, to obtain high resolution three-dimensional (3-D) images of seismic attenuation of P waves (Qp) down to 2 km depth. 2293 P wave spectra have been inverted for seismic attenuation to calculate t* values, considering a frequency-independent Q, and a ω2-type source model. The 3-D tomographic images reveal an anomalous region of very low Qp values (between 10 and 30), located in the same place where the 2001 dike emplaced. We interpret this anomaly as the effect of fluid intrusion (magma rich in gas) in the uppermost part of the Etna volcano, just before the 2001 eruption. This confirms that attenuation is a physical parameter sensitive to the thermal state of crustal volumes through which seismic waves travel.
Ibanez Miguel J.
Martínez-Arévalo Carmen
Patanè Domenico
Rietbrock Andreas
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