Discriminating geoelectrical signals measured in seismic and aseismic areas by using Ito models

2012 ◽  
Vol 391 (3) ◽  
pp. 809-818 ◽  
Author(s):  
Luciano Telesca ◽  
Zbigniew Czechowski
Keyword(s):  
Geoelectrical Signals

scholarly journals Multifractal fluctuations in earthquake-related geoelectrical signals

2005 ◽  
Vol 7 ◽  
pp. 214-214 ◽  
Author(s):  
Luciano Telesca ◽  
Vincenzo Lapenna ◽  
Maria Macchiato
Keyword(s):  
Geoelectrical Signals

Investigating the multifractal properties of geoelectrical signals measured in southern Italy

2004 ◽  
Vol 29 (4-9) ◽  
pp. 295-303 ◽  
Author(s):  
Luciano Telesca ◽  
Marianna Balasco ◽  
Gerardo Colangelo ◽  
Vincenzo Lapenna ◽  
Maria Macchiato
Keyword(s):  
Southern Italy ◽  
Geoelectrical Signals

scholarly journals The method of the phase control of the electrical installation during geodynamic monitoring

2019 ◽  
Vol 272 ◽  
pp. 01045
Author(s):  
N V Dorofeev ◽  
A V Grecheneva ◽  
O R Kuzichkin ◽  
R V Romanov ◽  
D I Surzhik
Keyword(s):  
Phase Modulation ◽  
Control Method ◽  
Phase Control ◽  
Monitoring Systems ◽  
Geological Environment ◽  
Geotechnical Monitoring ◽  
Geodynamic Monitoring ◽  
Amplitude Modulator ◽  
Geoelectrical Signals ◽  
Electrical Installation

The paper substantiates the application of the phase control of the multipolar equipotential electrical installation to improve the geodynamic sensitivity of the geoelectric control method in geodynamic and geotechnical monitoring systems. The principle of the control of the source of sounding signals and the detection of geodynamics of the geological environment is shown in article. In this work is proposed the device on base of the phase modulator to eliminate the shortcomings of existing devices of the controlling of the phase of sound geoelectrical signals. The developed device contains two amplitude limiters, the integrating unit, the adder, the master oscillator and the amplitude modulator. In practice the application of the proposed device allow to obtain the technical and the economic efficiency by simplifying of the circuit of the generation of the signal with the phase-modulation, by increasing the linearity of the modulation characteristic, and by generating of the signal with the phase-modulate on output of the device.

Geoelectrical monitoring of dissolution and precipitation reactions in a saturated calcareous porous medium

2020 ◽  
Author(s):  
Flore Rembert ◽  
Damien Jougnot ◽  
Linda Luquot ◽  
Pierpaolo Zuddas ◽  
Roger Guérin
Keyword(s):  
Porous Medium ◽  
Reactive Transport ◽  
Low Cost ◽  
Ionic Composition ◽  
Synthetic Medium ◽  
Low Frequency ◽  
Ionic Concentration ◽  
Concentration Gradients ◽  
Dissolution And Precipitation ◽  
Geoelectrical Signals

<p>Precipitation and dissolution are prime processes in carbonate rocks and being able to monitor them is a major deal of reservoir exploitation for geo-resources (water, gas) or geological storage (CO<sub>2</sub>, H<sub>2</sub>, waste). Geophysics can be used to monitor these processes non-intrusively and at low cost. Among the existing techniques, we used two electrical methods to monitor the reactivity of a synthetic calcareous porous medium: self-potential (SP) and spectral induced polarization (SIP). SP is a passive technique that consists in measuring the electrical field as it is affected by water fluxes and concentration gradients through electrokinetic and electrochemical couplings. SIP is an active method that provides the electrical conductivity and the chargeability of a porous medium in a low frequency range (mHz to kHz). We carried out a two months laboratory experiment to monitor the geoelectrical signals generated by chemical variations in a synthetic medium composed of pure calcite grains. Three different solutions were injected to alternatively dissolve or precipitate calcite in the sample. The sample is equipped with four aligned non-polarizable Ag/AgCl electrodes in order to geoelectrically monitor the fluid percolation and the ionic concentration gradients changes through the medium. Moreover, we conducted chemical analyses of the downstream fluid to monitor its ionic composition. We made a 1D reactive-transport simulation with the software CrunchFlow to get the concentration gradients of all dissolved ions along the column. Following a theoretical framework, we used a physically based analytical model to relate our electrical signals to ionic concentrations of a multicomponent electrolyte. We find that dissolution and precipitation generate measurable geoelectrical signals because of chemical reactions and ions substitutions. These findings open the possibility to better understand geoelectrical signals in natural media and possibly use them to monitor in situ reactivity.</p>

scholarly journals The construction of an Ito model for geoelectrical signals

2011 ◽  
Vol 390 (13) ◽  
pp. 2511-2519 ◽  
Author(s):  
Zbigniew Czechowski ◽  
Luciano Telesca
Keyword(s):  
Geoelectrical Signals

1/fα Fluctuations in geoelectrical signals observed in a seismic area of Southern Italy

2002 ◽  
Vol 347 (4) ◽  
pp. 253-268 ◽  
Author(s):  
Marianna Balasco ◽  
Vincenzo Lapenna ◽  
Luciano Telesca
Keyword(s):  
Southern Italy ◽  
Seismic Area ◽  
Geoelectrical Signals

Geoelectrical signals of geologic and hydrologic processes in a fringing reef lagoon setting

2014 ◽  
Vol 517 ◽  
pp. 508-520 ◽  
Author(s):  
Kevin M. Befus ◽  
M. Bayani Cardenas ◽  
Douglas R. Tait ◽  
Dirk V. Erler
Keyword(s):  
Fringing Reef ◽  
Hydrologic Processes ◽  
Reef Lagoon ◽  
Geoelectrical Signals ◽  
Fringing Reef Lagoon

Flicker-noise spectroscopy: a new approach to investigate the time dynamics of geoelectrical signals measured in seismic areas

2004 ◽  
Vol 29 (4-9) ◽  
pp. 389-395 ◽  
Author(s):  
Luciano Telesca ◽  
Vincenzo Lapenna ◽  
Serge Timashev ◽  
Grigory Vstovsky ◽  
Giovanni Martinelli
Keyword(s):  
Flicker Noise ◽  
New Approach ◽  
Time Dynamics ◽  
Noise Spectroscopy ◽  
Geoelectrical Signals

FLUCTUATION ANALYSIS OF THE HOURLY TIME VARIABILITY IN OBSERVATIONAL GEOELECTRICAL SIGNALS

2002 ◽  
Vol 02 (03) ◽  
pp. L235-L242 ◽  
Author(s):  
LUCIANO TELESCA ◽  
VINCENZO LAPENNA ◽  
MARIA MACCHIATO
Keyword(s):  
Significant Variation ◽  
Detrended Fluctuation Analysis ◽  
Southern Italy ◽  
Time Variability ◽  
Fluctuation Analysis ◽  
Long Range Correlations ◽  
Power Law Exponent ◽  
Seismic Area ◽  
Detrended Fluctuation ◽  
Geoelectrical Signals

We investigate, by the Detrended Fluctuation Analysis (DFA), the long-range correlations in the hourly time variability of geoelectrical signals measured by the station Tramutola, located in one of the most seismic area of southern Italy. The DFA power-law exponent, characterizing the temporal fluctuations of these signals, shows significant variation, possibly related with the seismic activity of the area investigated.

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