1,721,009 research outputs found
A new magnetotelluric monitoring network operating in Agri Valley (Southern Italy): study of stability of apparent resistivity estimates
No full text1D Model validation for the variations in Earth's apparent resistivity of Barricelle site (southern Italy)
No full textQuantifying persistent behavior in earth's apparent resistivity time series
No full textThe multiple segmenting method (MSM) has been applied to investigate the scaling behaviour in the Earth's apparent resistivity time series, measured in a seismic area of southern Italy. The study of apparent resistivity represents one of the most important scientific challenges in the studies devoted to the geophysical monitoring. Our results show that apparent resistivity is characterized by a persistent scaling behvaiour at all the periods considered, with the scaling exponent tending approximately to 0.5
Design and installation of a new magnetotelluric monitoring network operating in Agri Valley (Southern Italy)
No full textExtracting quantitative dynamics in Earth’s apparent resistivity time series by using the detrended fluctuation analysis
No full textThe magnetotelluric method (MT) consists in the observation of the surface natural variations of the electromagnetic field in a broad range of periods. The apparent resistivity is proportional to the modulus of the surface impedance, which is the tensorial relation between the horizontal components of the electric with the magnetic field. The subsurface resistivity distribution is obtained by inverting the apparent resistivity.
The method of the detrended fluctuation analysis (DFA) has been applied to investigate the dynamics of apparent resistivity, which. represents one of the most important scientific challenges in the studies devoted to the geophysical monitoring. Our results show that during July 2003 the time series representing variations of the apparent resistivity in the seismic area of Val d'Agri (southern Italy) are persistent at all the periods considered, tending to pure randomness with the increase of the period. Due to the relationship between the period and the depth, the observed variations are compatible with resistivity changes in the shallow layers
Non-uniform scaling features in magnetotelluric signals and possible correlation with seismicity
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