Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/5088
AuthorsMori, T.* 
Notsu, K.* 
Yasunori, T.* 
Wakita, H.* 
Nuccio, P. M.* 
Italiano, F.* 
TitleRemote detection of fumarolic gas chemistry at Vulcano, Italy, using an FT-IR spectral radiometer
Issue DateJun-1995
Series/Report no./134 (1995)
URIhttp://hdl.handle.net/2122/5088
KeywordsGas chemistry
FTIR
Volcano
fumaroles
Subject Classification04. Solid Earth::04.08. Volcanology::04.08.01. Gases 
AbstractAn infrared absorption spectroscopy remote sensing technique was used to determine the S02/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, were observed for four fumaroles a few tens of metres apart using the hot fumarolic surface as an infrared light source. The measured S02/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 S02/HCl ratio of the FA fumarole was higher than that of the gas collected directly in the fumarolic vent (S02/HCl ratio = 2.9), and was closer to the S~,,,,,,/HCl ratio (= 4.6) of the collected gas. Our results show that the SO,/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 S02/HCl ratios of volcanic plumes. Because temporal variations in S/Cl ratios can provide precursory signals for volcanic eruptions [l-31, this remote sensing technique can used efficiently for evaluation of volcanic activity.
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