Three years of high precision gravity measurements at the gravimetric station of Brasimone - Italy
From August 1995 up to now, at the Enea Research Center of Brasimone, in the Italian Apennines between Bologna and Florence (Italy: 44º07'N, 11º.07'E, 890 m height), the superconducting gravimeter GWR model TT70 number T015 has been continuously recording the variation of the local gravity...
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Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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ftdoajarticles:oai:doaj.org/article:c835bc575ff148e0ab51d6e248b5eb02 2023-05-15T15:37:24+02:00 Three years of high precision gravity measurements at the gravimetric station of Brasimone - Italy G. Casula 1998-06-01T00:00:00Z https://doi.org/10.4401/ag-4325 https://doaj.org/article/c835bc575ff148e0ab51d6e248b5eb02 EN eng Istituto Nazionale di Geofisica e Vulcanologia (INGV) http://www.annalsofgeophysics.eu/index.php/annals/article/view/4325 https://doaj.org/toc/1593-5213 https://doaj.org/toc/2037-416X doi:10.4401/ag-4325 1593-5213 2037-416X https://doaj.org/article/c835bc575ff148e0ab51d6e248b5eb02 Annals of Geophysics, Vol 41, Iss 2 (1998) Earth tides tidas analysis seismic spectral analysis Meteorology. Climatology QC851-999 Geophysics. Cosmic physics QC801-809 article 1998 ftdoajarticles https://doi.org/10.4401/ag-4325 2022-12-30T21:58:05Z From August 1995 up to now, at the Enea Research Center of Brasimone, in the Italian Apennines between Bologna and Florence (Italy: 44º07'N, 11º.07'E, 890 m height), the superconducting gravimeter GWR model TT70 number T015 has been continuously recording the variation of the local gravity field, in the frame of the Global Geodynamics Project. The gravimetric laboratory, being a room of the disused nuclear power plant of Brasimone, is a very stable site, free from noise due to human activities. Data blocks of several months of continuous gravity records have been collected over a time span of three years, together with the meteorological data. The gravimeter has been calibrated at relative accuracy better than 0.3% with the aid of a mobile mass system, by imposed perturbations of the local gravity field and recording the gravimeter response. The results of this calibration technique were checked by two comparison experiments with absolute gravimeters performed during this period: the first, in May 1994 with the aid of the symmetrical rise and fall gravimeter of the Institute of Metrology Colonnetti of Turin, and the second in October 1997 involving an FG5 absolute gravimeter of the Institute de Physique du Globe of Strasbourg. The gravimeter signal was analysed to compute a high precision tidal model for Brasimone site. Starting from a set of gravimetric and atmospheric pressure data of high quality, relative to 46 months of observation, we performed the tidal analysis using Eterna 3.2 software to compute amplitudes, gravimetric factors and phases of the main waves of the Tamura catalogue. Finally a comparison experiment between two of the STS-1/VBB broadband seismometers of the MedNet project network and the gravity records relative to the Balleny Islands earthquake (March 25, 1998) were analysed to look for evidence of normal modes due to the free oscillations of the Earth. Article in Journal/Newspaper Balleny Islands Directory of Open Access Journals: DOAJ Articles Balleny Islands Annals of Geophysics 41 2 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
Earth tides tidas analysis seismic spectral analysis Meteorology. Climatology QC851-999 Geophysics. Cosmic physics QC801-809 |
spellingShingle |
Earth tides tidas analysis seismic spectral analysis Meteorology. Climatology QC851-999 Geophysics. Cosmic physics QC801-809 G. Casula Three years of high precision gravity measurements at the gravimetric station of Brasimone - Italy |
topic_facet |
Earth tides tidas analysis seismic spectral analysis Meteorology. Climatology QC851-999 Geophysics. Cosmic physics QC801-809 |
description |
From August 1995 up to now, at the Enea Research Center of Brasimone, in the Italian Apennines between Bologna and Florence (Italy: 44º07'N, 11º.07'E, 890 m height), the superconducting gravimeter GWR model TT70 number T015 has been continuously recording the variation of the local gravity field, in the frame of the Global Geodynamics Project. The gravimetric laboratory, being a room of the disused nuclear power plant of Brasimone, is a very stable site, free from noise due to human activities. Data blocks of several months of continuous gravity records have been collected over a time span of three years, together with the meteorological data. The gravimeter has been calibrated at relative accuracy better than 0.3% with the aid of a mobile mass system, by imposed perturbations of the local gravity field and recording the gravimeter response. The results of this calibration technique were checked by two comparison experiments with absolute gravimeters performed during this period: the first, in May 1994 with the aid of the symmetrical rise and fall gravimeter of the Institute of Metrology Colonnetti of Turin, and the second in October 1997 involving an FG5 absolute gravimeter of the Institute de Physique du Globe of Strasbourg. The gravimeter signal was analysed to compute a high precision tidal model for Brasimone site. Starting from a set of gravimetric and atmospheric pressure data of high quality, relative to 46 months of observation, we performed the tidal analysis using Eterna 3.2 software to compute amplitudes, gravimetric factors and phases of the main waves of the Tamura catalogue. Finally a comparison experiment between two of the STS-1/VBB broadband seismometers of the MedNet project network and the gravity records relative to the Balleny Islands earthquake (March 25, 1998) were analysed to look for evidence of normal modes due to the free oscillations of the Earth. |
format |
Article in Journal/Newspaper |
author |
G. Casula |
author_facet |
G. Casula |
author_sort |
G. Casula |
title |
Three years of high precision gravity measurements at the gravimetric station of Brasimone - Italy |
title_short |
Three years of high precision gravity measurements at the gravimetric station of Brasimone - Italy |
title_full |
Three years of high precision gravity measurements at the gravimetric station of Brasimone - Italy |
title_fullStr |
Three years of high precision gravity measurements at the gravimetric station of Brasimone - Italy |
title_full_unstemmed |
Three years of high precision gravity measurements at the gravimetric station of Brasimone - Italy |
title_sort |
three years of high precision gravity measurements at the gravimetric station of brasimone - italy |
publisher |
Istituto Nazionale di Geofisica e Vulcanologia (INGV) |
publishDate |
1998 |
url |
https://doi.org/10.4401/ag-4325 https://doaj.org/article/c835bc575ff148e0ab51d6e248b5eb02 |
geographic |
Balleny Islands |
geographic_facet |
Balleny Islands |
genre |
Balleny Islands |
genre_facet |
Balleny Islands |
op_source |
Annals of Geophysics, Vol 41, Iss 2 (1998) |
op_relation |
http://www.annalsofgeophysics.eu/index.php/annals/article/view/4325 https://doaj.org/toc/1593-5213 https://doaj.org/toc/2037-416X doi:10.4401/ag-4325 1593-5213 2037-416X https://doaj.org/article/c835bc575ff148e0ab51d6e248b5eb02 |
op_doi |
https://doi.org/10.4401/ag-4325 |
container_title |
Annals of Geophysics |
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41 |
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2 |
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