Twenty Years Monitoring of Soil CO2 Flux and Seismicity at Cava dei Selci Gas Discharge (Colli Albani Volcano, Italy)
Abstract Cava dei Selci (CdS) is the main degassing site of the Colli Albani quiescent volcano and since 20 years it is the site of geochemical volcano monitoring. Emitted gas consists mostly of CO2 (≥98 vol.%) with minor H2S, and helium isotopes suggest it has a significant magmatic component. The...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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American Geophysical Union (AGU)
2022-06-01
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| Series: | Earth and Space Science |
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| Online Access: | https://doi.org/10.1029/2021EA001936 |
| _version_ | 1811344230937788416 |
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| author | Luca Tarchini Maria Luisa Carapezza Domenico Granieri Alberto Frepoli Nicola Mauro Pagliuca Massimo Ranaldi |
| author_facet | Luca Tarchini Maria Luisa Carapezza Domenico Granieri Alberto Frepoli Nicola Mauro Pagliuca Massimo Ranaldi |
| author_sort | Luca Tarchini |
| collection | DOAJ |
| description | Abstract Cava dei Selci (CdS) is the main degassing site of the Colli Albani quiescent volcano and since 20 years it is the site of geochemical volcano monitoring. Emitted gas consists mostly of CO2 (≥98 vol.%) with minor H2S, and helium isotopes suggest it has a significant magmatic component. The diffuse soil CO2 flux was monitored in the period 2000–2020, with 55 surveys on a target area. The total CO2 output fluctuates from 5.6 to 24.8 t d−1. The soil CO2 flux per unit surface (average 2.323 kg m−2 d−1) is the highest of 15 Italian actively degassing volcanic and geothermal areas. Soil CO2 flux and environmental parameter data collected over 4‐year of continuous monitoring (2004–2008) were analyzed by stochastic Gradient Boosting Trees regression (sGBT), Multiple Linear Regression, and Principal Component Regression. Only sGBT predicts the entire data set and effectively identifies the relationship between soil CO2 flux and environmental parameters. Residuals indicate two anomalous degassing periods (March‐2005, summer‐2007). Colli Albani area is affected by moderate seismicity (Md ≤ 4). 575 earthquakes occurring from 2009 to 2021 were analyzed determining their location, hypocenter depth, and focal mechanism (of 43 selected events). Evaluation of seismic events occurred across geochemical surveys within 30 km from CdS shows that there is a relationship between CO2 flux, earthquake focal mechanism and depth: shallow strike‐slip hypocenters are associated to low fluxes, deep normal‐faulting hypocenters to high CO2 output. |
| first_indexed | 2024-04-13T19:44:06Z |
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| id | doaj.art-3aa523d01c3e4d1b907c7c1706599f37 |
| institution | Directory Open Access Journal |
| issn | 2333-5084 |
| language | English |
| last_indexed | 2024-04-13T19:44:06Z |
| publishDate | 2022-06-01 |
| publisher | American Geophysical Union (AGU) |
| record_format | Article |
| series | Earth and Space Science |
| spelling | doaj.art-3aa523d01c3e4d1b907c7c1706599f372022-12-22T02:32:47ZengAmerican Geophysical Union (AGU)Earth and Space Science2333-50842022-06-0196n/an/a10.1029/2021EA001936Twenty Years Monitoring of Soil CO2 Flux and Seismicity at Cava dei Selci Gas Discharge (Colli Albani Volcano, Italy)Luca Tarchini0Maria Luisa Carapezza1Domenico Granieri2Alberto Frepoli3Nicola Mauro Pagliuca4Massimo Ranaldi5INGV—Istituto Nazionale di Geofisica e Vulcanologia Rome ItalyINGV—Istituto Nazionale di Geofisica e Vulcanologia Rome ItalyINGV—Istituto Nazionale di Geofisica e Vulcanologia Pisa ItalyINGV—Istituto Nazionale di Geofisica e Vulcanologia Rome ItalyINGV—Istituto Nazionale di Geofisica e Vulcanologia Rome ItalyINGV—Istituto Nazionale di Geofisica e Vulcanologia Rome ItalyAbstract Cava dei Selci (CdS) is the main degassing site of the Colli Albani quiescent volcano and since 20 years it is the site of geochemical volcano monitoring. Emitted gas consists mostly of CO2 (≥98 vol.%) with minor H2S, and helium isotopes suggest it has a significant magmatic component. The diffuse soil CO2 flux was monitored in the period 2000–2020, with 55 surveys on a target area. The total CO2 output fluctuates from 5.6 to 24.8 t d−1. The soil CO2 flux per unit surface (average 2.323 kg m−2 d−1) is the highest of 15 Italian actively degassing volcanic and geothermal areas. Soil CO2 flux and environmental parameter data collected over 4‐year of continuous monitoring (2004–2008) were analyzed by stochastic Gradient Boosting Trees regression (sGBT), Multiple Linear Regression, and Principal Component Regression. Only sGBT predicts the entire data set and effectively identifies the relationship between soil CO2 flux and environmental parameters. Residuals indicate two anomalous degassing periods (March‐2005, summer‐2007). Colli Albani area is affected by moderate seismicity (Md ≤ 4). 575 earthquakes occurring from 2009 to 2021 were analyzed determining their location, hypocenter depth, and focal mechanism (of 43 selected events). Evaluation of seismic events occurred across geochemical surveys within 30 km from CdS shows that there is a relationship between CO2 flux, earthquake focal mechanism and depth: shallow strike‐slip hypocenters are associated to low fluxes, deep normal‐faulting hypocenters to high CO2 output.https://doi.org/10.1029/2021EA001936Colli Albani volcanoItalymonitoring of soil CO2 fluxstochastic gradient boosting trees regressionColli Albani seismicitystochastic Gaussian simulation |
| spellingShingle | Luca Tarchini Maria Luisa Carapezza Domenico Granieri Alberto Frepoli Nicola Mauro Pagliuca Massimo Ranaldi Twenty Years Monitoring of Soil CO2 Flux and Seismicity at Cava dei Selci Gas Discharge (Colli Albani Volcano, Italy) Earth and Space Science Colli Albani volcano Italy monitoring of soil CO2 flux stochastic gradient boosting trees regression Colli Albani seismicity stochastic Gaussian simulation |
| title | Twenty Years Monitoring of Soil CO2 Flux and Seismicity at Cava dei Selci Gas Discharge (Colli Albani Volcano, Italy) |
| title_full | Twenty Years Monitoring of Soil CO2 Flux and Seismicity at Cava dei Selci Gas Discharge (Colli Albani Volcano, Italy) |
| title_fullStr | Twenty Years Monitoring of Soil CO2 Flux and Seismicity at Cava dei Selci Gas Discharge (Colli Albani Volcano, Italy) |
| title_full_unstemmed | Twenty Years Monitoring of Soil CO2 Flux and Seismicity at Cava dei Selci Gas Discharge (Colli Albani Volcano, Italy) |
| title_short | Twenty Years Monitoring of Soil CO2 Flux and Seismicity at Cava dei Selci Gas Discharge (Colli Albani Volcano, Italy) |
| title_sort | twenty years monitoring of soil co2 flux and seismicity at cava dei selci gas discharge colli albani volcano italy |
| topic | Colli Albani volcano Italy monitoring of soil CO2 flux stochastic gradient boosting trees regression Colli Albani seismicity stochastic Gaussian simulation |
| url | https://doi.org/10.1029/2021EA001936 |
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