Publication Date:
2019-11-21
Description:
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.
Description:
Published
Description:
39-49
Description:
JCR Journal
Description:
open
Keywords:
gravity
;
absolute gravimeter
;
measurements
;
geophysics
;
volcanology
;
04. Solid Earth::04.02. Exploration geophysics::04.02.99. General or miscellaneous
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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