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Authors: Carapezza, M. L.* 
Roscioni, F. R.* 
Tarchini, L.* 
Title: Diffuse degassing of carbon dioxide on the NW sector of Colli Albani volcanic complex (Rome, Italy)
Issue Date: 31-Jul-2007
Keywords: CO2 soil flux, Alban Hills volcano, gas hazard
Subject Classification04. Solid Earth::04.08. Volcanology::04.08.01. Gases 
Abstract: Systematic CO2 soil flux surveys at Cava dei Selci on the Colli Albani volcano (28 seasonal surveys since the year 2000) have shown a significant variation of diffuse CO2 release, with a marked decrease, from 25 to 4 tonnes/day, from May 2000 to August 2004, followed by a new increase. Over the same period, CO2 flux halved at S. Maria delle Mole (16.8 tonnes/day in 2000 and 8.3 tonnes/day in 2006). Also the quantity of CO2 dissolved in the deep waters of the Albano crater lake decreased by one order of magnitude in the period 1997-2006. The high CO2 flux values in 2000 could represent the “tail” of a strong degassing episode recorded at Colli Albani in 1995 and related to local earthquakes. The following decrease of CO2 flux could reflect a permeability decrease caused by hydrothermal calcite precipitation favored by PCO2 reduction in the deep source
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