A small L-shaped short-period seismic array was set up at Etna Volcano to measure the wave velocity and the incoming azimuth of the volcanic tremor generated by the volcanic activity at Etna in non eruptive-conditions. Cross-correlation techniques were used to measure the phase-shifts between the array stations. An approximately N-S direction of the propagation direction was estimated, coincident with the azimuth of the crater area of Etna. An apparent velocity of less than 500 m/s was estimated, suggesting a surface propagation of the tremor waves. Spectral analysis, confirming previous results, shows velocity spectra peaked at approximately 2 Hz. A localized source, coincident with the crater area, agrees with our data and could generate the volcanic tremor at Etna in non-eruptive stages. © 1993.
All Science Journal Classification (ASJC) codes
- Geochemistry and Petrology
Del Pezzo, E., De Martino, S., Gresta, S., Martini, M., Milana, G., Patanè, D., & Sabbarese, C. (1993). Velocity and spectral characteristics of the volcanic tremor at Etna deduced by a small seismometer array. Journal of Volcanology and Geothermal Research, 56(4), 369 - 378. https://doi.org/10.1016/0377-0273(93)90003-A