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Fiorenza, E.
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Fiorenza, E.
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- PublicationOpen AccessDeep Sea Gravity Measurements: GEOSTAR-2 Mission Results(2006-03-24)
; ; ; ; ;Iafolla, V.; Istituto di Fisica dello Spazio Interplanetario, CNR - via del Fosso del Cavaliere - 00133 Roma, Italy ;Nozzoli, S.; Istituto di Fisica dello Spazio Interplanetario, CNR - via del Fosso del Cavaliere - 00133 Roma, Italy ;Fiorenza, E.; Istituto di Fisica dello Spazio Interplanetario, CNR - via del Fosso del Cavaliere - 00133 Roma, Italy ;Milyukov, V.; Istituto di Fisica dello Spazio Interplanetario, CNR - via del Fosso del Cavaliere - 00133 Roma, Italy; ; ; A new concept gravity meter with sensitivity close to Hz ms / 10 2 8 − − in the range of 10 -5 −1Hz intended for observation of the vertical component of the Earth gravity and teleseismic waves was implemented at the Istituto di Fisica dello Spazio Interplanetario (IFSI), CNR and successfully operated during the GEOSTAR-2 mission. The gravimeter has demonstrated a capability to operate for long time in an autonomous regime and a good reliability for operation in extreme environments; at the same time the experimental measurements gave the information for the further gravimeter’s implementation. Results of observation and data analysis included the registration of seismic waves excited by global earthquakes and the evaluation of the low frequency modes of free oscillations of the Earth are reported.284 418 - PublicationRestrictedOS-IS® Sistema sismico per il monitoraggio e la previsione del moto ondoso(2014)
; ; ; ; ; ; ; ; ; ; ;Iafolla, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Carmisciano, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Fiorenza, E.; AGI srl ;Iafolla, V.; AGI srl ;Manzella, G.; ETT Solutions SpA ;Montani, L.; Autorità Portuale La Spezia ;Bencivenga, M.; Istituto Superiore per la Protezione e la Ricerca Ambientale ;Burlando, M.; Università di Genova - DICCA ;Solari, G.; Università di Genova - DICCA ;De Gaetano, P.; Università di Genova - DICCA; ; ; ; ; ; ; ; ; The European project “Wind, Ports, and Sea”, funded by the European Cross-border Programme “Italy–France Maritime 2007-2013”, aims to improve the safety conditions and to reduce the hazards by monitoring and forecasting the sea-state outside the main ports of the Northern Tyrrhenian and Ligurian Seas. The sea state forecast is done by using a numeric model specifically developed, while the used data are obtained by means of a monitoring system of stations installed in the coast of La Spezia harbor so to perform an inland remote monitoring. This remote monitoring system of the sea, called OSIS ® (Ocean Seismic - Integrated Solution), is a pilot project and will be presented in its main features. The main advantage of the OS-IS® is that it is installed inland and there are no parts in the sea. The key elements of the system are a high sensitivity accelerometers and apposite algorithms for the evaluation of the sea state using the micro-seismic signals on the basis of the mathematical models and the appropriate calibration factors. Actually, since the beginning of the 1900, is well known that the sea waves are sources of a microseismic noise and this phenomenon has been described with more and more precise models since the 1950 by Longuet-Higgins. The OS-IS® system used for "Wind, Ports and Sea" project is made of three micro-seismic stations installed near the La Spezia gulf: each accelerometric station is equipped with a weather station and a data logger that automatically transfers the data to a central server which runs the algorithm of the OS-IS®. In the following will be shortly described the installed systems focusing on its reliability and in the comparison with the traditional monitoring system using buoy. Finally the first measurements will be shown in comparison with those of the conventional method based on the buoys.384 94 - PublicationOpen AccessCharacterization of the response of spring relative gravimeters during paroxysmal eruptions at Etna volcano(2014-05-29)
; ; ; ; ; ; ; ; ;Greco, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;Iafolla, V.; Istituto Nazionale di Astrofisica, Istituto di Astrofisica e Planetologia Spaziali, Italy ;Pistorio, A.; Dipartimento di Ingegneria Elettrica Elettronica e Informatica, Università di Catania, Italy ;Fiorenza, E.; Istituto Nazionale di Astrofisica, Istituto di Astrofisica e Planetologia Spaziali, Italy ;Currenti, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;Napoli, R.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;Bonaccorso, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;Del Negro, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia; ; ; ; ; ; ; Gravity time sequences collected at Etna volcano by continuously recording spring-based relative gravimeters showed significant variations in temporal correspondence with paroxysmal eruptions. Since the observed gravity variations can only be partially related to subsurface mass redistribution phenomena, we investigated on the instrumental effects due to the ground vibrations as those accompanying explosive activity. We simulated the performances of relative gravimeters through laboratory experiments to estimate their response to vertical and horizontal excitations. Laboratory tests were carried out using a vibrating platform capable of accelerating the instruments with intensities and frequencies, in both the vertical and horizontal directions, observed in the ground vibrations associated with paroxysmal events. The seismic signals recorded at Etna volcano during the 10 April 2011 lava fountain were analyzed to retrieve the parameters used to drive the vibration platform. We tested two gravimeters used for Etna volcano monitoring: the LaCoste & Romberg D#185 and the Scintrex CG-3M#9310234. The experimental results highlight that vibrations, resembling the seismic waves propagated during paroxysmal events, cause an amplitude response in the gravity readings of the order of several hundred of microGals. Generally the relationship between the vibrations and the gravimeter response is non-linear with a fairly complex dependence on the frequencies and amplitude of the signals acting on the gravimeters.615 133