Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/5128
AuthorsGambino, S.* 
Cammarata, L.* 
Rapisarda, S.* 
TitleHigh precision locations of long-period events at La Fossa Crater (Vulcano Island, Italy)
Issue DateApr-2009
Series/Report no.2/52 (2009)
URIhttp://hdl.handle.net/2122/5128
Keywordssource geometry
waveform correlation
Subject Classification04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring 
AbstractSince the last eruption in 1888-90, the volcanic activity on Vulcano Island (Aeolian Archipelago, Italy) has been limited to fumarolic degassing. Fumaroles are mainly concentred at the active cone of La Fossa in the northern sector of the island and are periodically characterized by increases in the temperature as well as in the amount of both CO2 and He .Seismic background activity at Vulcano is dominated by micro-seismicity originating at shallow depth (<1-1.5 km) under La Fossa cone. This seismicity is related to geothermal system processes and comprises long period (LP) events. LPs are generally considered as the resonance of a fluid-filled volume in response to a trigger. We analyzed LP events recorded during an anomalous degassing period (August-October 2006) applying a high precision technique to define the shape of the trigger source. Absolute and high precision locations suggest that LP events recorded at Vulcano, during 2006, were produced by a shallow focal zone ca. 200 m long, 40 m wide and N30-40E oriented. Their occurrence is linked to magmatic fluid inputs that by modifying the hydrothermal system cause excitation of a fluid-filled cavity.
Appears in Collections:Annals of Geophysics
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