Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006geoji.167..959b&link_type=abstract
Geophysical Journal International, Volume 167, Issue 10, pp. 959-967.
Astronomy and Astrophysics
Astronomy
10
Cracked Media, Seismic Anisotropy, Shear Wave Splitting, Volcanic Activity, Volcanic Structure, Wave Propagation
Scientific paper
The time delays and polarizations of shear wave splitting above small earthquakes show variations before the 2001 July 17-August 9 2001 flank eruption on Mt Etna, Sicily. Normalized time delays, measured by singular value decomposition, show a systematic increase starting several days before the onset of the eruption. On several occasions before the eruption, the polarization directions of the shear waves at Station MNT, closest to the eruption, show 90°-flips where the faster and slower split shear waves exchange polarizations. The last 90°-flip being 5 days before the onset of the eruption. The time delays also exhibit a sudden decrease shortly before the start of the eruption suggesting the possible occurrence of a `relaxation' phenomena, due to crack coalescence. This behaviour has many similarities to that observed before a number of earthquakes elsewhere.
Bianco Francesca
Del Pezzo Edoardo
Patanè Domenico
Scarfi Luciano
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