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| Titel |
Diffuse volcanic degassing and thermal energy release 2015 surveys from the summit cone of Teide volcano, Tenerife (Canary Islands, Spain) |
| VerfasserIn |
Gladys Melián, María Asensio-Ramos, German Padilla, Mar Alonso, Simon Halliwell, Emerson Sharp, Damaris Butters, Dylan Ingman, Scott Alexander, Jenny Cook, Nemesio M. Pérez |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250128590
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| Publikation (Nr.) |
 EGU/EGU2016-8591.pdf |
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| Zusammenfassung |
| The summit cone of Teide volcano (Spain) is characterized by the presence of a weak
fumarolic system, steamy ground, and high rates of diffuse CO2 degassing all around this
area. The temperature of the fumaroles (83˚ C) corresponds to the boiling point of water at
discharge conditions. Water is the major component of these fumarolic emissions,
followed by CO2, N2, H2, H2S, HCl, Ar, CH4, He and CO, a composition typical of
hydrothermal fluids. Previous diffuse CO2 surveys have shown to be an important
tool to detect early warnings of possible impending volcanic unrests at Tenerife
Island (Melián et al., 2012; Pérez et al., 2013). In July 2015, a soil and fumarole
gas survey was undertaken in order to estimate the diffuse volcanic degassing and
thermal energy release from the summit cone of Teide volcano. A diffuse CO2
emission survey was performed selecting 170 observation sites according to the
accumulation chamber method. Soil CO2 efflux values range from non-detectable (∼0.5 g
m−2d−1) up to 10,672 g m−2d−1, with an average value of 601 g m−2d−1. Spatial
distribution maps were constructed following the sequential Gaussian simulation (sGs)
procedure. Measurement of soil CO2 efflux allowed an estimation of 162 ± 14 t d−1 of
deep seated derived CO2. To calculate the steam discharge associated with this
volcanic/hydrothermal CO2 output, we used the average H2O/CO2 mass ratio equal
to 1.19 (range, 0.44-3.42) as a representative value of the H2O/CO2 mass ratios
for Teide fumaroles. The resulting estimate of the steam flow associated with the
gas flux is equal to 193 t d−1. The condensation of this steam results in a thermal
energy release of 5.0×1011J d−1 for Teide volcano or a total heat flow of 6 MWt.
The diffuse gas emissions and thermal energy released from the summit of Teide
volcano are comparable to those observed at other volcanoes. Sustained surveillance
using these methods will be valuable for monitoring the activity of Teide volcano. |
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