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Martorana R.,University of Palermo | Capizzi P.,University of Palermo | D'Alessandro A.,INGV Rome | Luzio D.,University of Palermo
Near Surface Geoscience 2015 - 21st European Meeting of Environmental and Engineering Geophysics | Year: 2015

A systematic comparison is presented between some 2D resistivity models and their images by the inversion of synthetic datasets relating to three different arrays, suitable for multichannel data acquisitions (dipole-dipole (DD), Wenner-Schlumberger (WS) and multiple gradient (MG)). The goal is to study how the measurement errors affects the resolution of the tomographic models and the ability to retrieve correct information on buried targets. We considered different data acquisition patterns, gradually increasing the complexity of the combinations of potential spacing and dipolar distance. To this end we increased the number of current dipoles to obtain approximately the same amount of measures, increasing the investigation time. Results from noise-free and noisy data are discussed and compared with those from field data. The results show that: the quality of the inversion models, for a fixed noise level, depends significantly on the data acquisition pattern; the information recovery and the resolution, being equal the number of measurements, is overall better for WS and worse for DD; the decrease of sensitivity with depth is lower for particular acquisition patterns that allow to better resolve deeper targets; the MG array can be preferred because it provides comparable results, using a smaller number of current electrodes. © (2015) by the European Association of Geoscientists & Engineers (EAGE). Source


Berlusconi A.,University of Insubria | Brunori C.A.,INGV Rome | Campagnoli P.,AMBIENTE TERRA Studio Associato | Cinti F.R.,INGV Rome | And 9 more authors.
Rendiconti Online Societa Geologica Italiana | Year: 2013

In order to geometrically characterize the liquefaction features observed in the epicentral sector of the 2012 Emilia seismic sequence and to evaluate the potential for recording palaeoseismic features of the area, we performed two electric resistivity tomographic sections and 4 shallow corings, coupled with 14C datings and archaeological age estimates in selected sites. Preliminary results show that there is a good agreement between ERT sections and core-logs; moreover a major role in determining the scalar relationships of the liquefaction features is played by the local geomorphological and topographic setting. The high sedimentation rates obtained through core datings (4 - 20 mm/yr) suggest that the described methodological approach can cover time windows of only a few centuries, thus hardly encompassing, in this tectonic setting, a significant period for paleoseismological purposes. © Società Geologica Italiana, Roma 2013. Source


Simonelli A.,University of Pisa | Belfi J.,National Institute of Nuclear Physics, Italy | Beverini N.,University of Pisa | Carelli G.,University of Pisa | And 5 more authors.
Near Surface Geoscience 2015 - 21st European Meeting of Environmental and Engineering Geophysics | Year: 2015

In recent years the development of large ring laser gyroscopes gave birth to a new discipline: the rotational seismology. This field of study is rapidly expanding and many areas of geophysics are or can be involved, from geodesy to seismology to the monitoring of critical structures. New rotational sensors based on optical interferometry and Sagnac effect has been developed in the last two decades. These sensors are called ring laser gyroscopes (RLG) and are now able to cover the range of rotations of seismological interest i.e. from 10-2 to 10-9 rad/sec. A measure of rotations in seismology is of fundamental interest for several reasons: Quantitative seismology requires a measure of all the six degrees of freedom that characterize a rigid body's motion. Standard seismological observations are contaminated by rotations that produce a bias in the estimate of ground translation. Rotational observables provide important informations about the elastic properties of the subsoil. The extension of rotational observations to exploration seismology can improve resolution and accuracy of subsurface imaging. © (2015) by the European Association of Geoscientists & Engineers (EAGE). Source

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