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The Role Played By The Environmental Factors On Diffuse Soil Degassing At Stromboli Volcano
Author(s)
Type
Conference paper
Language
English
Obiettivo Specifico
1.2. TTC - Sorveglianza geochimica delle aree vulcaniche attive
Editor(s)
Status
Published
Conference Name
Issued date
May 31, 2010
Conference Location
Puerto de la Cruz, Tenerife, Spain
Sponsors
Comission of Cities and Volcanoes (CaV) of the International Association of Volcanology and Chemistry of the Earth's Interior (IAVCEI) Agencia Española de Cooperación Internacional para el Desarrollo (AECID), Gobierno de España Ministerio de Ciencia e Innovación (MICINN), Gobierno de España Unidad Militar de Emergencias (UME), Ministerio de Defensa, Gobierno de España Agencia Canaria de Investigación, Innovación y Sociedad de la Información (ACIISI), Gobierno de Canarias Viceconsejería de Infraestructuras y Planificación, Gobierno de Canarias Consejería de Turismo, Gobierno de Canarias Consejería de Medio Ambiente y Ordenación Territorial, Gobierno de Canarias Viceconsejería de Cultura y Deportes, Gobierno de Canarias Instituto Español de Oceanografía (IEO)Instituto Geológico y Minero de España (IGME)Instituto Geográfico Nacional (IGN)Academia Canaria de Seguridad Federación Canaria de Municipios (FECAM) Universidad de La Laguna (ULL)Instituto de Estudios Hispánicos de Canarias (IEHC) CajaCanarias
Keywords
Abstract
Geochemical surveys and continuous measurements of several gas species in volcanic areas are useful to identify changes in volcanic activity as well as in deep magmatic processes. Diffuse soil degassing in volcanic areas releases high amount of gases and its monitoring monitoring
can be helpful for the mitigation of risk and volcano
surveillance.
At Stromboli, previous surveys permitted us to recognize
the zones surrounding the crater where diffuse
degassing is active. Here we present the first results of
the in-soil [222Rn] and CO2 flux continuous monitoring
started in April 2007 in one of these zones. Measurements
of the CO2 flux and in-soil 222Rn concentration have been acquired simultaneously with the main environmental
parameters (soil and air temperature, atmospheric pressure, soil humidity, wind direction and velocity). A multivariate statistical analysis has been applied
on the entire acquired dataset, in order to outline the role of each environmental parameter in controlling the variation of in-soil degassing. Results show the key role played by the environmental factors in the process of soil gas transfer from depth to the surface. A good correlation has been found between 222Rn and CO2 flux,
confirming the role of the latter as carrier of other gas species. Our results stress the importance of the collection of environmental parameters in the geochemical monitoring aimed at the identification of the processes modulating soil diffuse degassing in volcanic areas. Furthermore,
the simultaneous acquisition of several gas
species can provide valuable information on the state of the volcano activity and its capability to release gas from its fracture network.
can be helpful for the mitigation of risk and volcano
surveillance.
At Stromboli, previous surveys permitted us to recognize
the zones surrounding the crater where diffuse
degassing is active. Here we present the first results of
the in-soil [222Rn] and CO2 flux continuous monitoring
started in April 2007 in one of these zones. Measurements
of the CO2 flux and in-soil 222Rn concentration have been acquired simultaneously with the main environmental
parameters (soil and air temperature, atmospheric pressure, soil humidity, wind direction and velocity). A multivariate statistical analysis has been applied
on the entire acquired dataset, in order to outline the role of each environmental parameter in controlling the variation of in-soil degassing. Results show the key role played by the environmental factors in the process of soil gas transfer from depth to the surface. A good correlation has been found between 222Rn and CO2 flux,
confirming the role of the latter as carrier of other gas species. Our results stress the importance of the collection of environmental parameters in the geochemical monitoring aimed at the identification of the processes modulating soil diffuse degassing in volcanic areas. Furthermore,
the simultaneous acquisition of several gas
species can provide valuable information on the state of the volcano activity and its capability to release gas from its fracture network.
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