Soil-gas method for tracing neotectonic faults in clay basins: the Pisticci field (Southern Italy)

Guerra, M.; Lombardi, S.

doi:10.1016/s0040-1951(01)00072-5

Cited by 65 publications

(38 citation statements)

References 12 publications

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“…In our study, a positive correlation between radon and CO 2 concentration was observed (Fig. 6b), similar to the findings of Guerra and Lombardi (2001). The measurement of gas profiles at different locations allows identification of a gas concentration pattern (Fig.…”

Section: Soil-gas Analysissupporting

confidence: 90%

Joint application of geophysical methods and Direct Push-soil gas surveys for the improved delineation of buried fault zones

Schütze

Vienken

Werban

et al. 2012

Journal of Applied Geophysics

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This study provides an example of fault structure delineation using both geophysical measurements and soilgas surveys. Seismic refraction and electrical resistivity tomography investigations were performed in combination with Direct Push (DP) soil gas concentration measurements, with the main objective being the characterization of an assumed permeable fault structure which is covered by sediments that are over 20 m thick. Geophysical methods were used to locate a potential fault zone and to provide an insight into the structural features of the covering sediments. Methods for quantifying the soil-gas concentration were applied to evaluate the permeability of the fault zone. The positioning of gas sampling points was based on results of a geophysical survey undertaken beforehand. Gas sampling was performed using DP-technology to obtain concentration profiles for the inert gas Radon-222 and its carrier gas CO 2 along the profile at different depths. Joint interpretation of the spatial distribution of geogenic gases and results from the geophysical survey allowed us to produce a representative model image of the fault structure consisting of two fault branches. Based on this image, it was possible to interpret the observed gas concentration patterns.

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Section: Soil-gas Analysissupporting

confidence: 90%

Joint application of geophysical methods and Direct Push-soil gas surveys for the improved delineation of buried fault zones

Schütze

Vienken

Werban

et al. 2012

Journal of Applied Geophysics

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“…Various statistical methods have been used by different authors in the past (Guerra and Lombardi, 2001;Fu et al, 2005;Yang et al, 2005;Walia et al, 2005) for identifying possible threshold values of the anomalous radon concentrations. A very common approach could be to examine the difference between radon peak and the mean value of the radon concentration for a few months or a year.…”

Section: Correlation Of Radon Concentration With Seismic Eventsmentioning

confidence: 99%

A study of variation in soil gas concentration associated with earthquakes near Indo-Burma Subduction zone

Singh

Jaishi

Tiwari

et al. 2016

Geoenviron Disasters

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“…Radon ( 222 Rn) concentration (C Rn in [Bq m −3 ]) in soil gases depends on 226 Ra concentration (C Ra [Bq kg −1 ]), emanation coefficient (ε; adimensional), soil density ( [kg m −3 ]) and effective porosity (n; adimensional) (Guerra and Lombardi, 2001;Schubert et al, 2001), as follows:…”

Section: Radon Physical-chemical Backgroundmentioning

confidence: 99%

CO 2 and Rn degassing from the natural analog of Campo de Calatrava (Spain): Implications for monitoring of CO 2 storage sites

Elío

Ortega

Nisi

et al. 2015

International Journal of Greenhouse Gas Control

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a b s t r a c tNatural analogs offer a valuable opportunity to investigate the long-term impacts associated with the potential leakage in geological storage of CO 2 .Degassing of CO 2 and radon isotopes ( 222 Rn-220 Rn) from soil, gas vents and thermal water discharges was investigated in the natural analog of Campo de Calatrava Volcanic Field (CCVF; Central Spain) to determine the CO 2 -Rn relationships and to assess the role of CO 2 as carrier gas for radon. Furthermore, radon measurements to discriminate between shallow and deep gas sources were evaluated under the perspective of their applicability in monitoring programs of carbon storage projects.CO 2 flux as high as 5000 g m −2 d −1 and 222 Rn activities up to 430 kBq m −3 were measured; 220 Rn activities were one order of magnitude lower than those of 222 Rn. The 222 Rn/ 220 Rn ratios were used to constrain the source of the Campo de Calatrava soil gases since a positive correlation between radon isotopic ratios and CO 2 fluxes was observed. Thus, in agreement with previous studies, our results indicate a deep mantle-related origin of CO 2 for both free and soil gases, suggesting that carbon dioxide is an efficient carrier for Rn. Furthermore, it was ascertained that the increase of 222 Rn in the soil gases was likely produced by two main processes: (i) direct transport by a carrier gas, i.e., CO 2 and (ii) generation at shallow level due to the presence of relatively high concentrations of dissolved U and Ra in the thermal aquifer of Campo de Calatrava.The diffuse CO 2 soil flux and radon isotopic surveys carried out in the Campo de Calatrava Volcanic Fields can also be applicable to geochemical monitoring programs in CCS (Carbon Capture and Storage) areas as these parameters are useful to: (i) constrain CO 2 leakages once detected and (ii) monitor both the evolution of the leakages and the effectiveness of subsequent remediation activities. These measurements can also conveniently be used to detect diffuse leakages.

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Soil-gas method for tracing neotectonic faults in clay basins: the Pisticci field (Southern Italy)

Cited by 65 publications

References 12 publications

Joint application of geophysical methods and Direct Push-soil gas surveys for the improved delineation of buried fault zones

Joint application of geophysical methods and Direct Push-soil gas surveys for the improved delineation of buried fault zones

A study of variation in soil gas concentration associated with earthquakes near Indo-Burma Subduction zone

CO 2 and Rn degassing from the natural analog of Campo de Calatrava (Spain): Implications for monitoring of CO 2 storage sites

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