Independent component analysis as a tool for ground deformation analysis

Bottiglieri, M.; Falanga, M.; Tammaro, Umberto; Obrizzo, F.; Martino, Prospero De; Godano, C.; Pingue, F.

doi:10.1111/j.1365-246x.2006.03264.x

Cited by 22 publications

(14 citation statements)

References 11 publications

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“…ICA was able to recognize nine periodicities in the recorded signals, namely 353,275,176,95,65,50,17,13, and 8 days (see Figure 2). This result is in good agreement with the previous one obtained by Bottiglieri et al [2007]. Some of these periods can be connected to a physical loading effect, whereas the origins of the other periods are still uncertain [Dong et al, 2002].…”

Section: Identification Of Independent Components and Statistical Anasupporting

confidence: 92%

Characterization of GPS time series at the Neapolitan volcanic area by statistical analysis

et al. 2010

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[1] The GPS time series recorded at the Neapolitan volcanic area reveals a very peculiar behavior. When a clear deformation is observed, the amplitude distribution evolves from a super-Gaussian to a broader distribution. This behavior can be characterized by evaluating the kurtosis. Spurious periodic components were evidenced by independent component analysis and then removed by filtering the original signal. The time series for all stations was modeled with a fifth-order polynomial fit, which represents the deformation history at that place. Indeed, when this polynomial is subtracted from the time series, the distributions again become super-Gaussian. A simulation of the deformation time evolution was performed by superposing a Laplacian noise and a synthetic deformation history. The kurtosis of the obtained signals decreases as the superposition increases, enlightening the insurgence of the deformation. The presented approach represents a contribution aimed at adding further information to the studies about the deformation at the Neapolitan volcanic area by revealing geologically relevant data.

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Section: Identification Of Independent Components and Statistical Anasupporting

confidence: 92%

Characterization of GPS time series at the Neapolitan volcanic area by statistical analysis

et al. 2010

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“…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. Some seasonal variations in the tiltmeter pattern were recognised over 21 months of data (29 March 2015-31 December 2016) by De Lauro et al 2018; at the present, due to the availability of four years of data, we can go further and investigate the temporal pattern of ground deformation and its eventual seasonal variations more deeply.…”

Section: Discussionmentioning

confidence: 99%

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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“…1). The recordings include the first 34 d of the effusion began on 28 December 2002, and lasted until 6 July 2003 (see e.g., Calvari et al, 2005;Cesca et el., 2007). During the crises, a fissure opened at the base of the NE crater.…”

Section: Strombolimentioning

confidence: 99%

“…The specifics of the tidal constituents involved in the dynamics have been recently investigated in De Lauro et al (2018). They evidenced three tidal constituents by ICA (Bottiglieri et al, 2007(Bottiglieri et al, , 2010: lunar monthly Mm (T = 27.55 d); lunar fortnightly Mf (T = 13.66 d); solar diurnal S1 (T = 24 h). The interaction between tidal constituents and ground tilting was highlighted by performing a tilt vector polarization analysis, with the intent to recover information about the preferred directions of oscillation on those long time scales.…”

Section: Campi Flegreimentioning

confidence: 99%

Interaction between seismicity and deformation on different time scales in volcanic areas: Campi Flegrei and Stromboli

et al. 2019

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Abstract. We study oscillations recorded at Stromboli and Campi Flegrei by different sensors: seismometers, strainmeters and tiltmeters. We examine both the high-frequency (>0.5 Hz) portion of the spectrum and very long period signals up to tidal scales. In this context, seismicity and deformation are investigated on different time scales (from minutes to days/years) in order to identify the basic elements of their interaction, whose understanding should provide new insights on the predictive models. In this work, the strict relation of tides and volcanic processes is shown. At Stromboli, indeed the transition from the stationary phase to the non-stationary phase seems to have a tidal precursor that is related to the duration of the crisis. The subsequent volcanic activity is interpreted as the response of the volcano to restore the equilibrium condition. The moveout from equilibrium produces, first, variations in the standard statistics of explosions, then leads to effusive stage and to a pressure drop in the shallow feeding system. That process induces the nucleation of a gas bubble and the excitation of low frequencies. Campi Flegrei seismicity shows a correlation between the diurnal solar solid tide and the energy released by the long period signals, indicating that the whole mechanism is modulated on a tidal scale. In other words, in the case of Stromboli, a departure from the equilibrium state is marked by solid tide variations in a certain frequency band. On the other hand, at Campi Flegrei diurnal to annual solid tides modulate an increase of volcanic activity.

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Independent component analysis as a tool for ground deformation analysis

Cited by 22 publications

References 11 publications

Characterization of GPS time series at the Neapolitan volcanic area by statistical analysis

Characterization of GPS time series at the Neapolitan volcanic area by statistical analysis

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

Interaction between seismicity and deformation on different time scales in volcanic areas: Campi Flegrei and Stromboli

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