Recent Seismicity at Vulcano Island (Southern Italy) and Adjacent Regions: Time Patterns and Periodicities

Bottari, Antonio; Caccamo, D.; Montalto, A.; Neri, G.; Privitera, E.

doi:10.1007/978-3-642-77008-1_6

Cited by 4 publications

(2 citation statements)

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“…External factors, even of small magnitude, can perturb the system especially when it is in an unstable state close to a critical threshold. FALSAPERLA et al (1989) andBOTTARI et al (1992) ascertained that the volcanic system of Vulcano is quite reactive to stress induced by seismic activity in surrounding zones, and to exogenous agents. For example, remarkable changes were measured in 1978 at geophysical parameters corresponding to the seismic crisis of the Gulf of Patti (FALSAPERLA et al, 1989).…”

Section: Discussionmentioning

confidence: 99%

“…The tectonic earthquakes, preceded by a marked deformation phase, were related to the activation of an important tectonic structure which also controls the evolution of volcanism on the island (FRAZZETTA et al, 1977(FRAZZETTA et al, , 1982. BOTTARI et al (1992) observed a periodicity of 420 days taking into account the time evolution of regional faulting earthquakes and shocks related to fluid dynamics recorded at Vulcano from 1978 to 1988. The authors tentatively related such periodicity to the earth's free nutation process, the Chandler wobble.…”

Section: Discussionmentioning

confidence: 99%

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Relationship between Micro-shocks Recorded on the Island of Vulcano (Italy) and Meteorological Parameters

Falsaperla

Gurrieri

Lombardo

1998

Pure and Applied Geophysics

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Swarms of micro-shocks having low magnitude (B0), and duration between 2 and 4 seconds are often recorded at Vulcano in the Aeolian Archipelago (Italy) close to Gran Cratere which is the most recent eruptive edifice of the island. This study describes the characteristics of such peculiar seismic events, and examines their relationship with meteorological parameters. The set of shocks considered spanned from 1984 and 1990, and is here analyzed along with the daily values of temperature, barometric pressure, humidity, and amount of rainfall. The meteorological parameters were recorded at a station which was located a few kilometers from Gran Cratere. On the basis of their features, seismic events were divided into two groups: one showing a monochromatic character with a dominant spectral peak at 9.4 Hz, the other having a wider spectrum with dominant peaks in the range between 7 and 14 Hz. From the cross-correlation analysis of seismic and meteorological data a seasonal distribution of the occurrence of such micro-shocks can be surmised. Significant relationships with a 99% confidence level were found with all meteorological parameters. In particular, rainfalls precede with a short-time interval (about one day) the occurrence of these swarms. This result inferentially leads to an origin of such shocks in the surficial part of the volcano, and a source mechanism which may be linked to activation of microfractures induced by the action of meteoric water.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%