Seismic-induced accelerations detected by two parallel gravity meters in continuous recording with a high sampling rate at Etna volcano
We analyse a microgravity data set acquired from two spring LaCoste & Romberg gravity meters operated in parallel at the same site on Etna volcano (Italy) for about two months (August September 2005). The high sampling rate acquisition (2Hz) allowed the correlation of short-lasting gravity...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Istituto Nazionale di Geofisica e Vulcanologia (INGV)
2008-06-01
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| Series: | Annals of Geophysics |
| Subjects: | |
| Online Access: | http://www.annalsofgeophysics.eu/index.php/annals/article/view/4441 |
| _version_ | 1811259014442385408 |
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| author | P. Stefanelli A. Sicali I. Loretti C. Del Negro C. Carmisciano F. Greco |
| author_facet | P. Stefanelli A. Sicali I. Loretti C. Del Negro C. Carmisciano F. Greco |
| author_sort | P. Stefanelli |
| collection | DOAJ |
| description | We analyse a microgravity data set acquired from two spring LaCoste & Romberg gravity meters operated in parallel at the same site on Etna volcano (Italy) for about two months (August September 2005). The high sampling rate acquisition (2Hz) allowed the correlation of short-lasting gravity fluctuations with seismic events. After characterizing the oscillation behavior of the meters, through the study of spectral content and the background noise level of both sequences, we recognized fluctuations in the gravity data, spanning a range of periods from 1 second to about 30 seconds dominated by components with a period of about 15 ÷ 25 seconds, during time intervals encompassing both local seismic events and large worldwide earthquakes. The data analyses demonstrate that observed earthquake-induced gravity fluctuations have some differences due to diverse spectral content of the earthquakes. When local seismic events which present high frequency content excite the meters, the correlation between the two gravity signals is poor (factor < 0.3). Vice versa, when large worldwide earthquakes occur and low frequency seismic waves dominate the ensuing seismic wavefield, the resonance frequencies of the meters are excited and they react according to more common features. In the latter case, the signals from the two instruments are strongly correlated to each other (up to 0.9). In this paper the behaviors of spring gravimeters in the frequency range of the disturbances produced by local and large worldwide earthquakes are presented and discussed. |
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| format | Article |
| id | doaj.art-007c77cb8cd34d5499f6529b79cd6bd4 |
| institution | Directory Open Access Journal |
| issn | 1593-5213 2037-416X |
| language | English |
| last_indexed | 2024-04-12T18:24:05Z |
| publishDate | 2008-06-01 |
| publisher | Istituto Nazionale di Geofisica e Vulcanologia (INGV) |
| record_format | Article |
| series | Annals of Geophysics |
| spelling | doaj.art-007c77cb8cd34d5499f6529b79cd6bd42022-12-22T03:21:18ZengIstituto Nazionale di Geofisica e Vulcanologia (INGV)Annals of Geophysics1593-52132037-416X2008-06-015118710310.4401/ag-4441Seismic-induced accelerations detected by two parallel gravity meters in continuous recording with a high sampling rate at Etna volcanoP. StefanelliA. SicaliI. LorettiC. Del NegroC. CarmiscianoF. GrecoWe analyse a microgravity data set acquired from two spring LaCoste & Romberg gravity meters operated in parallel at the same site on Etna volcano (Italy) for about two months (August September 2005). The high sampling rate acquisition (2Hz) allowed the correlation of short-lasting gravity fluctuations with seismic events. After characterizing the oscillation behavior of the meters, through the study of spectral content and the background noise level of both sequences, we recognized fluctuations in the gravity data, spanning a range of periods from 1 second to about 30 seconds dominated by components with a period of about 15 ÷ 25 seconds, during time intervals encompassing both local seismic events and large worldwide earthquakes. The data analyses demonstrate that observed earthquake-induced gravity fluctuations have some differences due to diverse spectral content of the earthquakes. When local seismic events which present high frequency content excite the meters, the correlation between the two gravity signals is poor (factor < 0.3). Vice versa, when large worldwide earthquakes occur and low frequency seismic waves dominate the ensuing seismic wavefield, the resonance frequencies of the meters are excited and they react according to more common features. In the latter case, the signals from the two instruments are strongly correlated to each other (up to 0.9). In this paper the behaviors of spring gravimeters in the frequency range of the disturbances produced by local and large worldwide earthquakes are presented and discussed.http://www.annalsofgeophysics.eu/index.php/annals/article/view/4441gravimetersearthquakesseismic-induced effectsgravity fluctuationsresonance |
| spellingShingle | P. Stefanelli A. Sicali I. Loretti C. Del Negro C. Carmisciano F. Greco Seismic-induced accelerations detected by two parallel gravity meters in continuous recording with a high sampling rate at Etna volcano Annals of Geophysics gravimeters earthquakes seismic-induced effects gravity fluctuations resonance |
| title | Seismic-induced accelerations detected by two parallel gravity meters in continuous recording with a high sampling rate at Etna volcano |
| title_full | Seismic-induced accelerations detected by two parallel gravity meters in continuous recording with a high sampling rate at Etna volcano |
| title_fullStr | Seismic-induced accelerations detected by two parallel gravity meters in continuous recording with a high sampling rate at Etna volcano |
| title_full_unstemmed | Seismic-induced accelerations detected by two parallel gravity meters in continuous recording with a high sampling rate at Etna volcano |
| title_short | Seismic-induced accelerations detected by two parallel gravity meters in continuous recording with a high sampling rate at Etna volcano |
| title_sort | seismic induced accelerations detected by two parallel gravity meters in continuous recording with a high sampling rate at etna volcano |
| topic | gravimeters earthquakes seismic-induced effects gravity fluctuations resonance |
| url | http://www.annalsofgeophysics.eu/index.php/annals/article/view/4441 |
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