Publication Date:
2017-04-04
Description:
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.
Description:
Published
Description:
38
Description:
2V. Dinamiche di unrest e scenari pre-eruttivi
Description:
JCR Journal
Description:
restricted
Keywords:
absolute gravimeter
;
gravity acceleration
;
comparison of absolute gravimeters
;
04. Solid Earth::04.08. Volcanology::04.08.07. Instruments and techniques
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
