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http://hdl.handle.net/2122/5088
Authors: | Mori, T.* Notsu, K.* Yasunori, T.* Wakita, H.* Nuccio, P. M.* Italiano, F.* |
Title: | Remote detection of fumarolic gas chemistry at Vulcano, Italy, using an FT-IR spectral radiometer | Journal: | Earth and Planetary Science Letters | Series/Report no.: | /134 (1995) | Publisher: | Elsevier | Issue Date: | Jun-1995 | Keywords: | Gas chemistry FTIR Volcano fumaroles |
Subject Classification: | 04. Solid Earth::04.08. Volcanology::04.08.01. Gases | Abstract: | An 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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