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Authors: D’Agostino, G.*
Desogus, S.*
Germak, A.*
Origlia, C.*
Quagliotti, D.*
Berrino, G.*
Corrado, G.*
D’errico, V.*
Ricciardi, G.*
Title: The new IMGC-02 transportable absolute gravimeter: measurement apparatus and applications in geophysics and volcanology
Issue Date: Feb-2008
Series/Report no.: 1/51 (2008)
Keywords: gravity
absolute gravimeter
Abstract: The research carried out at the Istituto Nazionale di Ricerca Metrologica (formerly Istituto di Metrologia «G. Colonnetti») aiming to develop a transportable ballistic absolute gravimeter ended with a new version of the instrument, called the IMGC-02. It uses laser interferometry to measure the symmetrical free rising and falling motion of a test mass in the gravity field. Providing the same accuracy achieved with previous versions, the instrumental improvements mainly concern size, weight, data processing algorithms and operational simplicity. An uncertainty of 9 μGal (1 μGal=1×10–8 m·s−2) can be achieved within a single observation session, lasting about 12 h, while the time series of several observation sessions show a reproducibility of 4 μGal. At this level, gravity measurements provide useful information in Geophysics and Volcanology. A wide set of dynamic phenomena, i.e. seismicity and volcanic activity, can produce temporal gravity changes, often quite small, with an amplitude ranging from a few to hundreds of microgals. Therefore the IMGC absolute gravimeter has been employed since 1986 in surveying the Italian active volcanoes. A brief history of the gravimeter and the description of the new apparatus, together with the main results of ongoing applications in Geophysics and Volcanology are presented.
Appears in Collections:04.02.99. General or miscellaneous
Annals of Geophysics

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