Anomalous soil CO2 degassing in relation to faults and eruptive fissures on Mount Etna (Sicily, Italy) |
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Authors: | Salvatore Giammanco Sergio Gurrieri Mariano Valenza |
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Institution: | (1) Istituto di Geochimica dei Fluidi, CNR, Via Ugo La Malfa, 153, I-90146 Palermo, Italy Fax: +39 91 680 9449 e-mail: peppo@igf.pa.cnr.it, IT;(2) Dipartimento di Chimica e Fisica della Terra ed Applicazioni, Università di Palermo, Via Archirafi, 36, I-90133 Palermo, Italy, IT |
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Abstract: | The relationships between soil gas emissions and both tectonic and volcano-tectonic structures on Mt. Etna have been studied.
The investigation consisted of soil CO2 flux measurements along traverses orthogonal to the main faults and eruptive fissures of the volcano. Anomalous levels of
soil degassing were found mainly in coincidence with faults, whereas only 49% of the eruptive fissures were found to produce
elevated CO2 soil fluxes. This result suggests that only zones of strain are able to channel deep gases to the surface. According to this
hypothesis, several previously unknown structures are suggested. Based on our geochemical data, new structural maps of different
areas of Etna are proposed. The soil CO2 fluxes observed in this study are higher than those measured in a 1987 study, and they are consistent with the higher level
of volcanic unrest during the current study.
Received: 20 March 1998 / Accepted: 17 June 1998 |
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Keywords: | Etna CO2 Soil degassing Tectonics Volcanic activity |
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