Publication Date:
2017-04-04
Description:
We report on a continuous-measurement campaign carried out in Vulcano (Aeolian islands, Sicily), devoted to
the simultaneous monitoring of CO2 and H2O concentrations. The measurements were performed with an
absorption spectrometer based on a semiconductor laser source emitting around a 2-μm wavelength. The
emitted radiation was selectively absorbed by two molecular ro-vibrational transitions specific of the investigated
species. Data for CO2 and H2O concentrations, and CO2soil diffusive flux using an accumulation chamber
configuration, were collected at several interesting sampling points on the island (Porto Levante beach- PLB,
Fossa Grande Crater - FOG- and Valley of Palizzi, PAL). CO2/H2O values, measured on the ground, are very
similar (around 0.019 (± 0.006)) and comparable to the previous discrete detected values of 0.213 (Fumarole F5
-La Fossa crater rim) and 0.012 (Fumarole VFS - Baia Levante beach) obtained during the 1977-1993 heating
phase of the crater fumaroles.
In this work much more homogeneous values are found in different points of the three sites investigated.
The field work, although carried out in a limited time window (25th-28th August 2004), pointed out the new
apparatus is suitable for continuous gas monitoring of the two species and their ratios, which are important
geochemical indicators of volcanic activity, for which other reliable continuous monitoring systems are not yet
available.
Description:
Published
Description:
on line only
Description:
1.2. TTC - Sorveglianza geochimica delle aree vulcaniche attive
Description:
JCR Journal
Description:
open
Keywords:
diode-laser-based
;
degassing
;
04. Solid Earth::04.02. Exploration geophysics::04.02.02. Gravity methods
;
04. Solid Earth::04.02. Exploration geophysics::04.02.07. Instruments and techniques
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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