Improvement and development of the tiltmetric monitoring networks of Neapolitan volcanoes

Ricco, C.; Aquino, I.; Augusti, V.; D’Auria, Luca; Gaudio, Carlo Del; Scarpato, Giovanni

doi:10.4401/ag-7496

Cited by 11 publications

(15 citation statements)

References 3 publications

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“…3. Overall, the rose plots show that the resulting azimuth values range in a narrow interval, confirming as observed in De Lauro et al 2018and Ricco et al (2019). Nevertheless, this analysis applied to 4 year-long dataset which allows finer investigation over smaller sub-intervals, brings out some additional outcomes, evidencing that in some cases a broader distribution is obtained.…”

Section: Discussionsupporting

confidence: 86%

“…4; see also Fig. 8 in Ricco et al, 2019). This observation suggests that the connection between meteoric water amount and non-uniform azimuthal distributions should be deeply examined.…”

Section: Discussionmentioning

confidence: 83%

“…The past analyses of the ground tilt at Campi Flegei have evidenced that medium/long period tidal constituents induce ground oscillations which are superimposed to the normal deformation trend of the area Ricco et al, 2019). In particular, the monthly Mm, fortnightly Mf and solar diurnal S1 constituents were recognized in tilt data by using the Independent Component Analysis (Bottiglieri et al, 2007, De Lauro et al, 2018.…”

Section: Discussionmentioning

confidence: 99%

“…Signals acquired by surface tilt sensors can be significantly conditioned by temperature range; in particular, bubble-tiltmeters are very sensitive to daily thermal variations whose source is the solar radiation heating the ground not uniformly. In order to reduce the thermal excursions and the background noise on tilt signals, the three digital borehole instruments (CMP, ECO and HDM) were installed at average depths of 25 m, where the temperature fluctuations are on the order of 0.01 ÷ 0.02 • C (Aquino et al, 2016;Ricco et al, 2018). These tiltmeter stations consist of digital sensors model "Lily Self-Leveling Borehole Tiltmeter" (Jewell Instruments ex AGI) equipped with a self-leveling bubble electrolyte on a range of ± 10 • , with a dynamic range of ± 330 µradians and a resolution less than 5 nradians.…”

Section: The Tiltmeter Network At Campi Flegreimentioning

confidence: 99%

“…Otherwise, the analysis of the deformation induced by exogenous components can be exploited to obtain useful indications on the shallow structure of the medium and its rheology, as well as on the crustal stress state (Queitsch et al, 2014;Lesparre et al, 2017;De Lauro et al, 2018). Sometimes the mixing between exogenous and endogenous factors is so complex that the external causes can even influence the internal processes (McNutt and Beavan, 1981;De Martino et al 2011a, 2011bDe Lauro et al, 2012Petrosino et al, 2018;Ricco et al, 2019;Cusano et al, 2020). As example, recent studies have highlighted that earth tides modulate the occurrence of long-period volcanic earthquakes (De Lauro et al, 2012) and volcano-tectonic seismicity (Petrosino et al, 2018) at Campi Flegrei, thus evidencing that exogenous phenomena play a role in the dynamics of the area.…”

Section: Introductionmentioning

confidence: 99%

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Time evolution of medium and long-period ground tilting at Campi Flegrei caldera

et al. 2020

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Abstract. We analyse tiltmeter time series recorded from April 2015 to March 2019 at three borehole instruments installed at Campi Flegrei caldera (Italy). We evaluate the crustal response in terms of ground tilting to external excitations of medium/long-period tidal constituents by applying a polarization analysis. The azimuths of the tilt vectors show well-defined polarization directions and the ground tilting planes oscillate with the periodicity of the corresponding tidal constituents. For two of the three tiltmeters, the average ground oscillation pattern related to the monthly Mm and fortnightly Mf constituents show seasonal variations, which can be ascribed to rainfall-induced tilting. In addition, for the same two instruments, a clear seasonal amplitude modulation of the diurnal S1 constituent appears in the time series, revealing the occurrence of site thermoelastic effects. The results indicate that the tidal tilting is mainly controlled by the local stress field distribution and rheology; in addition, seasonal exogenous factors like rainfalls play a role in modulating the ground deformation.

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Section: Discussionsupporting

confidence: 86%

“…4; see also Fig. 8 in Ricco et al, 2019). This observation suggests that the connection between meteoric water amount and non-uniform azimuthal distributions should be deeply examined.…”

Section: Discussionmentioning

confidence: 83%

Section: Discussionmentioning

confidence: 99%

Section: The Tiltmeter Network At Campi Flegreimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Time evolution of medium and long-period ground tilting at Campi Flegrei caldera

et al. 2020

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The Permanent Monitoring System of the Campi Flegrei Caldera, Italy

Bianco

Caliro

Martino

et al. 2022

Active Volcanoes of the World

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Joint estimation of tiltmeter drift and volume variation during reservoir monitoring

Furst

Chéry

Mohammadi

et al. 2019

J Geod

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Borehole tiltmeters are widely used to continuously record small surface deformation of reservoirs and volcanoes. Because these instruments display unknown long-term drift, only short-term tilt signal can be used for monitoring purpose. We propose a method to invert long-term time series of tilt data induced by strain variations at depth. The assumption that tiltmeter drift is linear over time is on its own insufficient to remove the drift and uniquely determine the deformation source parameters. To overcome this problem, we first invert the data with no constrain on the drift to obtain one particular solution among all admissible. Then, using the linearity of the forward model, we use the statistical properties of the drift distributions to restore the uniqueness of the solution. We illustrate our approach with four synthetic cases simulating volume changes of a reservoir. We demonstrate the efficiency of our method and show that the accuracy of estimated volume variation dramatically improves if low drift tiltmeters are used.

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Improvement and development of the tiltmetric monitoring networks of Neapolitan volcanoes

Cited by 11 publications

References 3 publications

Time evolution of medium and long-period ground tilting at Campi Flegrei caldera

Time evolution of medium and long-period ground tilting at Campi Flegrei caldera

The Permanent Monitoring System of the Campi Flegrei Caldera, Italy

Joint estimation of tiltmeter drift and volume variation during reservoir monitoring

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