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|Authors: ||D’Agostino, 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)|
|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
|Appears in Collections:||04.02.99. General or miscellaneous|
Annals of Geophysics
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