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Authors: Camarda, M.* 
De Gregorio, S.* 
Di Martino, R. M. R.* 
Favara, R.* 
Title: Temporal and spatial correlations between soil CO2 flux and crustal stress
Journal: Journal of geophysical research - solid earth 
Series/Report no.: 10/121 (2016)
Publisher: American Geophysical Union
Issue Date: Oct-2016
DOI: 10.1002/2016JB013297
Keywords: Soil CO2 flux
Crustal stress
seismotectonic process
Subject Classification04. Solid Earth::04.04. Geology::04.04.99. General or miscellaneous 
04. Solid Earth::04.04. Geology::04.04.12. Fluid Geochemistry 
04. Solid Earth::04.07. Tectonophysics::04.07.99. General or miscellaneous 
Abstract: In seismically active areas, tectonic stress deforms and breaks the rocks of the crust. Ongoing deformation produces detectable modifications in the shallower portions of the crust, resulting in a wide variety of changes in several parameters. In this paper, we report the results of a large-scale spatial (across an area of 15,000 km2) and temporal (up to 3 years) investigation of the relationship between active crustal stress and soil CO2 flux. We deployed a network of 10 automatic stations in most of the seismically active districts of southern Italy to monitor the soil CO2 fluxes, and we used seismicity data to track crustal stress. The results of the investigation show that the CO2 flux signals varied independently in the districts with low and sporadic seismicity. Conversely, in the only district with nearly continuous seismic activity, almost all of the CO2 flux signals were well correlated with each other, and we recorded a clear synchronous sharp increase of the seismicity and signals recorded by several stations. The high spatial and temporal correlation between seismicity and gas discharge evidenced in this study prove that the crustal stress associated with the seismogenic process is able to effectively modulate the gas release in a seismically active area.
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