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D'Agostino, Giancarlo
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D'Agostino, Giancarlo
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- PublicationRestrictedAbsolute gravity measurements at three sites characterized by different environmental conditions using two portable ballistic gravimeters(2015)
; ; ; ; ; ; ; ;Greco, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;Biolcati, E.; Istituto Nazionale di Ricerca Metrologica, Torino, Italy ;Pistorio, A.; Dipartimento di Ingegneria Elettrica, Elettronica e Informatica, Università di Catania, Italy ;D'Agostino, G.; Istituto Nazionale di Ricerca Metrologica, Torino, Italy ;Germak, A.; Istituto Nazionale di Ricerca Metrologica, Torino, Italy ;Origlia, C.; Istituto Nazionale di Ricerca Metrologica, Torino, Italy ;Del Negro, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia; ; ; ; ; ; The performances of two absolute gravimeters at three different sites in Italy between 2009 and 2011 is presented. The measurements of the gravity acceleration g were performed using the absolute gravimeters Micro-g LaCoste FG5#238 and the INRiM prototype IMGC-02, which represent the state of the art in ballistic gravimeter technology (relative uncertainty of a few parts in 10 9 ). For the comparison, the measured g values were reported at the same height by means of the vertical gravity gradient estimated at each site with relative gravimeters. The consistency and reliability of the gravity observations, as well as the performance and efficiency of the instruments, were assessed by measurements made in sites charac- terized by different logistics and environmental conditions. Furthermore, the various factors affecting the measurements and their uncertainty were thoroughly investigated. The measurements showed good agree- ment, with the minimum and maximum differences being 4.0 and 8.3 µGal. The normalized errors are very much lower than 1, ranging between 0.06 and 0.45, confirming the compatibility between the results. This excellent agreement can be attributed to several factors, including the good working order of gravimeters and the correct setup and use of the instruments in different conditions. These results can contribute to the standardization of absolute gravity surveys largely for applications in geophysics, volcanology and other branches of geosciences, allowing achieving a good trade-off between uncertainty and efficiency of gravity measurements.481 21 - PublicationOpen AccessABSOLUTE AND RELATIVE GRAVITY MEASUREMENTS AT ETNA VOLCANO (ITALY)(2010-06-22)
; ; ; ; ; ; ; ; ; ; ; ;Greco, Filippo; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;Currenti, Gilda; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;D'Agostino, Giancarlo; Istituto Nazionale di Ricerca Metrologica, INRiM, Torino, Italy, ;Del Negro, Ciro; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;Di Stefano, Agnese; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;Germak, Alessandro; Istituto Nazionale di Ricerca Metrologica, INRiM, Torino, Italy, ;Napoli, Rosalba; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;Origlia, Claudio; Istituto Nazionale di Ricerca Metrologica, INRiM, Torino, Italy, ;Pistorio, Antonio; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;Scandura, Danila; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;Sicali, Antonino; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia; ; ; ; ; ; ; ; ; ; ; ; ;Peshekhonov, Vladimir G.; Academician of the RASEmploying both absolute and relative gravimeters, we carried out three hybrid microgravity surveys at Etna volcano between 2007 and 2009. The repeated measurements highlighted the spatio-time evolution of the gravity field associated with the volcanic unrest. We detected a gravity increase attained an amplitude of about 80 µGal on the summit area of the volcano between July 2008 and July 2009. The observed gravity increase could reflect mass accumulations into shallow magma storage system of the volcano located at 1÷2 km below sea level. We present here data and the advantages in using the combined approach of relative and absolute measurements performed at Etna volcano.279 312 - PublicationRestrictedCombining relative and absolute gravity measurements to enhance volcano monitoring(2012-06-16)
; ; ; ; ; ; ; ;Greco, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;Currenti, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;D'Agostino, G.; INRiM-Torino, Italy ;Germak, A.; INRiM-Torino, Italy ;Napoli, R.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;Pistorio, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;Del Negro, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia; ; ; ; ; ; To achieve a balance between uncertainty and efficiency in gravity measurements, we have investigated the applicability of combined measurements of absolute and relative gravity as a hybrid method for volcano monitoring. Between 2007 and 2009, three hybrid gravity surveys were conducted at Mt Etna volcano, in June 2007, July 2008, and July 2009. Absolute gravity data were collected with two absolute gravimeters, which represent the state of the art in recent advances in ballistic gravimeter technology: (1) the commercial instrument FG5#238 and (2) the prototype instrument IMGC-02. We carried out several field surveys and confirmed that both the absolute gravimeters can still achieve a 10 μGal or better uncertainty even when they are operated in severe environmental conditions. The use of absolute gravimeters in a field survey of the summit area of Mt Etna is unprecedented. The annual changes of the gravity measured over 2007–2008 and 2008–2009 provide unequivocal evidence that during the 2007–2009 period, two main phenomena of subsurface mass redistribution occurred in distinct sectors of the volcano, accompanying different eruptive episodes. From 2007 to 2008, a gravity change of −60 μGal was concentrated around the North- East Rift. This coincided with a zone affected by strong extensional tectonics, and hence might have been related to the opening of new voids. Between 2008 and 2009, a North-South elongate feature with a maximum gravity change of +80 μGal was identified in the summit craters area. This is interpreted to indicate recharge of a deepintermediate magma storage zone, which could have occurred when the 2008–2009 eruption was still ongoing.371 27 - PublicationRestrictedLong term plumb-line alignment of precise measuring instruments:An adaptive digital controller designed for an autoleveling platform(2010)
; ; ; ;D'Agostino, G.; Mechanical Division, Istituto Nazionale di Ricerca Metrologica (INRIM), Torino 10135, Italy ;Germak, A.; Mechanical Division, Istituto Nazionale di Ricerca Metrologica (INRIM), Torino 10135, Italy ;Berrino, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia; ; Plumb-line alignment can affect the sensors of precise scientific instruments. When its effect is one of the main contributors to the measurement uncertainty, the deviation from the true vertical must be continuously monitored or compensated. This paper describes a digital control system designed and tested for an autoleveling platform. Best performances are obtained with an adaptive digital compensator based on a convolution of the error signal. Although accuracy and resolution of the leveling transducer limit the ultimate sensitivity, laboratory tests showed that the controller kept for several hours the base-plate top within 1 rad. These performances are suitable for maintaining the alignment of relative spring gravimeters used by volcanologists in long-term gravity measurements.176 19