Remote detection of fumarolic gas chemistry at Vulcano, Italy, using an FT-IR spectral radiometer

Details Remote detection of fumarolic gas chemistry at Vulcano, Italy, using an FT-IR spectral radiometer Remote detection of fumarolic gas chemistry at Vulcano, Italy, using an FT-IR spectral radiometer

Aug 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995e%26psl.134..219m&link_type=abstract

Earth and Planetary Science Letters, vol. 134, Issue 1-2, pp.219-224

Physics

11

Scientific paper

An infrared absorption spectroscopy remote sensing technique was used to determine the SO 2 /HCl ratio in fumarolic plumes at Vulcano, Italy. The measurements were made from the southern crater rim of Fossa Grande Crater, about 400 m from the fumarolic area in the crater. Infrared absorption spectra of HCl and SO 2 were observed for four fumaroles a few tens of metres apart using the hot fumarolic surface as an infrared light source. The measured SO 2 /HCl ratios in the FA, F47, FW and lower parti of the F21 fumaroles were 4.5-5.4, 3.5, 9.5-11.2 and 5.8 respectively. The SO 2 /HCl ratio of the FA fumarole was higher than that of the gas collected directly in the fumarolic vent (SO 2 /HCl RATIO = 2.9), and was closer to the S (total) /HCl ratio (= 4.6) of the collected gas. Our results show that the SO 2 /HCl ratios of two fumaroles only a few tens of metres apart exhibits differences of about twofold. This suggests that this remote monitoring technique is capable of detecting spatial distribution in the SO 2 /HCl ratios of volcanic plumes. Because temporal variations in S/Cl ratios can provide precursory signals for volcanic eruptions [1-3], this remote sensing technique can used efficiently for evaluation of volcanic activity.

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