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Natural Gas Hazard (CO2, 222Rn) within a Quiescent Volcanic Region and Its Relations with Tectonics: The Case of the Ciampino-Marino Area, Alban Hills Volcano, Italy

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Abstract

Groundwater surveys were performed by detailed(around 300 sites) grid-analysis of water temperature, pH, redox potential, electrical conductivity, 222Rn, alkalinity and by calculating the pCO2, throughout the Ciampino and Marino towns in the Alban Hills quiescent volcano (Central Italy). Following several episodes of dangerous CO2 exhalation from soils during the last 20 years and earlier ashistorically recorded, 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 (HsS, 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 convection and enhanced permeability in certain sectors of the main aquifer, i.e., along the bordering faults and inside the gas-trap of the Ciampino Horst., where ``continuous gas-phase micro-macro seepage mechanism'' is invoked to explain the high peri-volcanic gases flux.

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Authors and Affiliations

  1. Istituto Nazionale di Geofisica & Vulcenologia, Via di Vigna Murata 605, 00143, Rome, Italy

    L. Pizzino, G. Galli, F. Quattrocchi & P. Scarlato

  2. Dipartimento di Ingegneria Nucleare, Universitá La Sapienza di Roma, Piazza S. Pietro in Vincoli 10, 00185, Roma

    C. Mancini

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  1. L. Pizzino
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Pizzino, L., Galli, G., Mancini, C. et al. Natural Gas Hazard (CO2, 222Rn) within a Quiescent Volcanic Region and Its Relations with Tectonics: The Case of the Ciampino-Marino Area, Alban Hills Volcano, Italy. Natural Hazards 27, 257–287 (2002). https://doi.org/10.1023/A:1020398128649

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