000			01933pab a2200157 454500
008			180718b2002 xxu||||| |||| 00| 0 eng d
100			_aPizzino, L.
245			_aNatural gas hazard (CO2, 222Rn) within a Quiescent volcanic regionand its relations with tectonics: the case of the Ciampin-Marino Area, Albaan Hills Volcano, Italy
260			_c2002
300			_ap.257-87.
362			_aNov
520			_aGroundwater surveys were performed by detailed (around 300 sites) grid-analysis of water temperature, pH, redox potential, electrical conductivity, 22Rn, alkalinity and by calculating the PCOs, throughout the Ciampino and Marino towns in the Alban Hills quiescent volcano (Central Italy). Following several episodes of dangerous COs exhalation from soils during the last 20 years and earlier as historically record3ed, the work aimed at assessing the Natural Gas Hazard (NGH) including the indoor-Rn hazard. The NGH was defined as the probability of an area to become a site of poisonous peri-volcanic gas exhalations from soils to the lower atmosphere (comprising buildings). CO2 was found to be a "carrier" for the other poisonous minor and in trace components (H2S, CH4, 222Rn, etc.). This assessment was performed by extrapolating in the aquifer CO2 and 222Rn conditions, and discriminating sectors where future CO2 flux in soils as well as indoor-Rn measurements have to be noted. A preliminary indoor-Rn survey was performed at about 200 sites. The highest values were found in the highest pCO2 and high 222Rn values in groundwater. This indicates convecytion and enhanced permeability in certain sectors of the main aquifer, i.e., along the bordering faults and inside the gap-trap of the Ciampino Horst., where "continuous gas-phase micro-macro seepage mechanism" is invoked to explain the high peri-volcanic gases flux. - Reproduced.
650			_aGas resources
773			_aNatural Hazards
909			_a54753
999			_c54753 _d54753