Broadband measurements of the sources of explosions at Stromboli Volcano, Italy

Chouet, Bernard; Saccorotti, Gilberto; Dawson, Phillip B.; Martini, M.; Scarpa, Roberto; Luca, Gaetano De; Milana, Giuliano; Cattaneo, M.

doi:10.1029/1999gl900400

Cited by 116 publications

(111 citation statements)

References 12 publications

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“…Nevertheless, Very Long Period signals (hereafter noted VLPTs) have been observed in only a few cases, as on Aso, (Japan), where Kaneshima et al [1996] reported tremors with periods of 10-15s. VLPTs of 20s, 11 -12s and 7s have also been recorded on Erebus, Antarctica [Rowe et al, 1998;Aster et al, 2003] as well as events with periods up to 20s on Stromboli, Italy [Chouet et al, 1999].…”

Section: Introductionmentioning

confidence: 97%

Interpretation of very long period tremors at Ambrym volcano, Vanuatu, as quasi‐static displacement field related to two distinct magmatic sources

Legrand

Rouland²,

Frogneux³

et al. 2005

Geophysical Research Letters

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A 3‐component broadband seismometer (STS‐2) has been deployed on the SW slope of Ambrym, Vanuatu, a large‐caldera volcano with two persistent lava lakes from July to November 2000. Well‐polarized Very Long Period Tremors (18–22s; VLPTs) occurred quite continuously, whereas other seismic signal with periods of 9s, 6–7s, 5s, 2.3–2.7s, 1.95s and 1s were intermittent. VLPTs signals show two clearly distinct directions pointing towards the caldera. Polarization orientations suggest two sources: the first one, and the most active, fits with the zone from which silicic lava flows erupted in 1986, in the central‐to‐eastern part of the caldera. The second one corresponds to the active zone formed by the complex Marum volcanic center and the Benbow cone, in the western part of the depression structure. The depths are estimated between 2.7–2.9 km with respect to sea level. VLPTs are interpreted as the quasi static‐displacement field of two nondestructive sources. They indicate the persistent continuing magmatic activity beneath the eastern floor of the caldera, although no volcanic activity is observed in this area, and the more obvious, but less active, corresponding to the lava lakes. These data also corroborate the complex internal structure of the Ambrym caldera, suggested by geological data and bimodal magmatism (basaltic, ∼50% SiO2, and silicic, ∼60% SiO2).

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Section: Introductionmentioning

confidence: 97%

Interpretation of very long period tremors at Ambrym volcano, Vanuatu, as quasi‐static displacement field related to two distinct magmatic sources

Legrand

Rouland²,

Frogneux³

et al. 2005

Geophysical Research Letters

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“…Here, we analyse the large data set recorded during the experiment performed in 1997 (see Chouet et al (1999Chouet et al ( , 2003 and references therein). Twenty-one three-component Guralp CMG-40T broad-band (0.02−60 s) seismometers were deployed on the Stromboli volcano by the U.S. Geological Survey, University of L'Aquila, Osservatorio Vesuviano and National Seismic Survey.…”

Section: Data Set and Preliminary Analysis: Time Energy Evolutionmentioning

confidence: 99%

Statistical analysis of Stromboli VLP tremor in the band [0.1–0.5] Hz: some consequences for vibrating structures

Lauro

Martino

Falanga

et al. 2006

Nonlin. Processes Geophys.

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Abstract.We analyze time series of Strombolian volcanic tremor, focusing our attention on the frequency band [0.1-0.5] Hz (very long period (VLP) tremor). Although this frequency band is largely affected by noise, we evidence two significant components by using Independent Component Analysis with the frequencies, respectively, of ∼0.2 and ∼0.4 Hz. We show that these components display wavefield features similar to those of the high frequency Strombolian signals (>0.5 Hz). In fact, they are radially polarised and located within the crater area. This characterization is lost when an enhancement of energy appears. In this case, the presence of microseismic noise becomes relevant. Investigating the entire large data set available, we determine how microseismic noise influences the signals. We ascribe the microseismic noise source to Scirocco wind. Moreover, our analysis allows one to evidence that the Strombolian conduit vibrates like the asymmetric cavity associated with musical instruments generating self-sustained tones.

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“…Chouet et al, , 1999Chouet et al, , 2003, the dynamics underlying the generation of these behaviours is not yet well understood.…”

Section: Application Of Ica To Strombolian Eventsmentioning

confidence: 99%

Characterization of Strombolian events by using independent component analysis

Ciaramella

Lauro

Martino

et al. 2004

Nonlin. Processes Geophys.

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Abstract. We apply Independent Component Analysis (ICA) to seismic signals recorded at Stromboli volcano. Firstly, we show how ICA works considering synthetic signals, which are generated by dynamical systems. We prove that Strombolian signals, both tremor and explosions, in the high frequency band (>0.5 Hz), are similar in time domain. This seems to give some insights to the organ pipe model generation for the source of these events. Moreover, we are able to recognize in the tremor signals a low frequency component (<0.5 Hz), with a well defined peak corresponding to 30 s.

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Broadband measurements of the sources of explosions at Stromboli Volcano, Italy

Cited by 116 publications

References 12 publications

Interpretation of very long period tremors at Ambrym volcano, Vanuatu, as quasi‐static displacement field related to two distinct magmatic sources

Interpretation of very long period tremors at Ambrym volcano, Vanuatu, as quasi‐static displacement field related to two distinct magmatic sources

Statistical analysis of Stromboli VLP tremor in the band [0.1–0.5] Hz: some consequences for vibrating structures

Characterization of Strombolian events by using independent component analysis

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