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Authors: Chiodini, G.* 
Cardellini, C.* 
Amato, A.* 
Boschi, E.* 
Caliro, S.* 
Frondini, F.* 
Ventura, G.* 
Title: Carbon dioxide Earth degassing and seismogenesis in central and southern Italy
Issue Date: 2004
Series/Report no.: 31, L07615
DOI: 10.1029/2004GL019480
Keywords: Carbon dioxide
Central Italy
Southern Italy
Subject Classification01. Atmosphere::01.01. Atmosphere::01.01.07. Volcanic effects 
03. Hydrosphere::03.04. Chemical and biological::03.04.02. Carbon cycling 
04. Solid Earth::04.04. Geology::04.04.12. Fluid Geochemistry 
04. Solid Earth::04.07. Tectonophysics::04.07.02. Geodynamics 
Abstract: We present the first regional map of CO2 Earth degassing from a large area (most of central and south Italy) derived from the carbon of deep provenance dissolved in the main springs of the region. The investigation shows that a globally significant amount of deeply derived CO2 (10% of the estimated global CO2 emitted from subaerial volcanoes) is released by two large areas located in western Italy. The anomalous flux of CO2 suddenly disappears in the Apennine in correspondence to a narrow band where most of seismicity concentrates. Here, at depth, the gas accumulates in crustal traps generating CO2 overpressurized reservoirs which induce seismicity.
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