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Monitoring crustal changes at volcanoes by seismic noise interferometry: Mt. Etna case of study
- Publication Year :
- 2017
- Publisher :
- EGU General Assembly 2017, 2017.
-
Abstract
- In this work, we analysed the seismic noise recorded at Mt. Etna by 18 stations during the interval 2007–2015 in the frequency band 0.1–0.3 Hz, chosen to avoid contamination from volcanic tremor. Variations in time of medium seismic velocity in the range − 0.8 to 0.8% were found, mostly affecting the stations located on the volcano summit and flanks. Based on the investigated frequency content, the Δ v / v changes took place from the surface to a depth of ~ 4.5–6.5 km. To identify the source mechanism of the observed medium changes, the variations were quantitatively compared by wavelet transform coherence with volcano-tectonic and meteorological parameters. A significant relationship with meteorological parameters with seasonal periodicity (especially air temperature and snow loading) was found, probably caused by thermo-elastic strain and increasing-decreasing surface loading cycles. Moreover, a sharp medium velocity decrease, taking place in mid-December 2009 and clearly time-related to the largest volcano-tectonic strain release phenomenon of the investigated period, was also found. Such a velocity decrease was interpreted as resulting from ascent of fluids and gas exsolution taking place at the same time as the volcano-tectonic swarm.
- Subjects :
- geography
geography.geographical_feature_category
010504 meteorology & atmospheric sciences
Frequency band
Mt. Etna
Meteorological parameters
Seismic noise
Seismic noise interferometry
Volcanic tremor
Geophysics
Geochemistry and Petrology
010502 geochemistry & geophysics
Snow
Geodesy
Seismic noise interferometry, Mt. Etna, Meteorological parameters, Volcanic tremor
01 natural sciences
Interferometry
Volcano
Air temperature
Range (statistics)
Coherence (signal processing)
Seismology
Geology
0105 earth and related environmental sciences
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....415e680aca7e143bffdd4833a835c7cd