Results 151 to 160 of about 557 (187)

Structural changes of volcanic tremor at Stromboli volcano

Journal of Volcanology and Geothermal Research, 2008
Abstract The occurrence of a tectonic event sufficiently close to a volcano and/or sufficiently energetic can trigger a change in its eruptive activity. Examples include Ambrym (Vanuatu), Teide (Spain), Tungurahua (Ecuador) and Villarrica (Chile). Of course the possibility that an earthquake can even trigger a new eruption has serious implications in
FATTORI SPERANZA FRANCESCA, CARNIEL ROBERTO   +1 more
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Intermittent behaviour of volcanic tremor at Mt. Etna

pure and applied geophysics, 1996
Harmonic tremor is widely studied and modelled in a very narrow frequency band (1–5 Hz) which represents the eigenfrequencies of a resonator assumed as the source of the phenomenon. Minimal effort was dedicated towards understanding its behaviour in larger temporal scales.
GODANO, Cataldo, Cardaci C, Privitera E.
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A volcanic tremor monitoring system

Journal of Volcanology and Geothermal Research, 1985
Abstract The digitising system installed at the Chateau Observatory, in the North Island of New Zealand, to monitor Ruapehu and Ngauruhoe volcanoes is used to digitise the seismic records from three seismometers, and to calculate the power spectra of volcanic tremor in real-time, with the smoothed power spectra being recorded every 5 minutes on ...
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On the spectral peaks of volcanic tremor at Stromboli

Physics of the Earth and Planetary Interiors, 1999
Abstract Seismic activity at Stromboli Volcano is characterized by a variety of signals, emanating from three vents. For a long time, the northwest vent has been in constant activity. Periodically, large explosions occur and material is ejected beyond the crater walls.
Mercè Urquizú, Antoni M. Correig
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Spectral parameters of volcanic tremors at etna

Journal of Volcanology and Geothermal Research, 1977
Abstract Volcanic tremors at Etna and Stromboli show two dominant peaks in the spectrum at 2.7 Hz and 4.0 Hz. A model is evaluated which attributes these peaks to weakly damped, harmonic oscillating sources in the upper part of the magma column.
M. Riuscetti, R. Schick, D. Seidl
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Volcanic harmonic tremor location

Journal of Volcanology and Geothermal Research, 2023
Fidencio A. Nava, Lenin Ávila-Barrientos, Juan M. Espíndola, Francisco J. Núñez-Cornú   +3 more
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Very-Long-Period Volcanic Tremor at Stromboli, Italy

Bulletin of the Seismological Society of America, 2005
We analyze a long time–space series of Stromboli volcanic tremors. A very-low-frequency content in the range of 0.02–0.5 Hz has been found by using spectral analysis and independent component analysis. Independent component analysis is an entropy-based technique. We observe the occurrence of a component having a period of 30 sec.
De Martino S, Falanga A, Scarpa R, GODANO, Cataldo   +3 more
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Modelling of volcanic tremor wave fields

Journal of Volcanology and Geothermal Research, 1992
Abstract The comparison of the temporal variations of the volcanic tremor for various eruptions shows stable connection between tremor intensity and volcanic activity. We have determined the wave pattern of seismic signals produced by individual explosions in the crater during eruption of the Tolbachik volcano (Kamchatka). Considering an explosion in
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Seismic tremors and magma wagging during explosive volcanism

Nature, 2011
Volcanic tremor is a ubiquitous feature of explosive eruptions. This oscillation persists for minutes to weeks and is characterized by a remarkably narrow band of frequencies from about 0.5 Hz to 7 Hz (refs 1-4). Before major eruptions, tremor can occur in concert with increased gas flux and related ground deformation.
A Mark, Jellinek, David, Bercovici
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Volcanic tremor at Mt. Etna: State-of-the-art and perspectives

pure and applied geophysics, 1987
Volcanic tremor on Etna seems to have its origin within the main magma feeding system. On the basis of both spectral analyses at two permanent seismic stations and periodical measurements along the slopes of the volcano, two distinct sources are proposed.
GRESTA, Stefano, IMPOSA, Sebastiano, PATANÈ D., PATANÈ G.   +3 more
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