A new magnetotelluric monitoring network operating in Agri Valley (Southern Italy): study of stability of apparent resistivity estimates

M. Balasco, V. Lapenna, G. Romano, A. Siniscalchi, L. Telesca

Abstract


Variations detected in geophysical, especially electromagnetic, parameters in seismic active areas have been
sometimes attributed to modifications of the stress field. Among the different geophysical methods, magnetotellurics
(MT) could be one of the most effective because it allows us to explore down to seismogenic depths. Continuous
MT recording could allow us to evaluate whether possible variations are significantly correlated with the
seismic activity of investigated area. To assess the significance of such observations we must be able to say how
well an apparent resistivity curve should be reproduced when measurements are repeated at a later time. To do
this properly it is essential to know that the estimated error bars accurately represent the true uncertainties in
comparing the transfer functions. In this work we will show the preliminary results obtained from the analysis
of the data coming from the new MT monitoring network installed in Agri Valley. This analysis gives us the possibility:
i) to better study the temporal stability of the signals, ii) to better discriminate the noise affecting the
measures by remote reference estimation. The performed analysis disclosed a relatively low degree of noise in
the investigated area, which is a promising condition for monitoring.

Keywords


magnetotelluric;remote reference;apparent resistivity curve;earthquake precursors

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References


DOI: https://doi.org/10.4401/ag-3047
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Published by INGV, Istituto Nazionale di Geofisica e Vulcanologia - ISSN: 2037-416X