Open AccessIndependent component analysis as a tool for ground deformation analysis
Author(s) -
Bottiglieri M.,
Falanga M.,
Tammaro U.,
Obrizzo F.,
De Martino P.,
Godano C.,
Pingue F.
Publication year - 2007
Publication title -
geophysical journal international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0956-540X
DOI - 10.1111/j.1365-246x.2006.03264.x
Subject(s) - residual , deformation (meteorology) , amplitude , volcano , geodesy , geology , global positioning system , independent component analysis , seismology , time series , signal (programming language) , deformation monitoring , remote sensing , computer science , telecommunications , physics , statistics , mathematics , optics , artificial intelligence , algorithm , oceanography , programming language
SUMMARY Independent component analysis (ICA) is a recent and well‐known technique used to separate mixtures of signals. This technique has been applied to the ground deformation time‐series recorded at the permanent GPS network of the Osservatorio Vesuviano—INGV in order to characterize the deformation background level in the Neapolitan volcanic area. The analysis revealed the presence of five independent periodic signals common at all the GPS stations; some of them are interpreted as effects of earth tides. The residual signal at each station represent the local ground deformation. Unfortunately the ICA cannot provide the absolute amplitude of the components, indeed we are not able to obtain a residual amplitude at each station. Then we used a stationarity analysis in order to investigate the eventual presence of local transient deformations. The ICA technique combined with the stationarity analysis has shown to be a very interesting tool for individuating ground deformation trends and could be very useful in volcanic areas monitoring.