Fault-controlled Soil CO2 Degassing and Shallow Magma Bodies: Summit and Lower East Rift of Kilauea Volcano (Hawaii), 1997 |
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| Authors: | Salvatore Giammanco Sergio Gurrieri Mariano Valenza |
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| Institution: | (1) INGV, Section of Catania, Piazza Roma 2, I-95123, Italy;(2) INGV, Section of Palermo, Via La Malfa 153, Palermo, I-90146, Italy;(3) Dipartimento di Chimica e Fisica della Terra ed Applicazioni, Universitá degli Studi di Palermo, via Archirafi 36, Palermo, I-90133, Italy |
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| Abstract: | Soil CO2 flux measurements were carried out along traverses across mapped faults and eruptive fissures on the summit and the lower
East Rift Zone of Kilauea volcano. Anomalous levels of soil degassing were found for 44 of the tectonic structures and 47
of the eruptive fissures intercepted by the surveyed profiles. This result contrasts with what was recently observed on Mt.
Etna, where most of the surveyed faults were associated with anomalous soil degassing. The difference is probably related
to the differences in the state of activity at the time when soil gas measurements were made: Kilauea was erupting, whereas
Mt. Etna was quiescent although in a pre-eruptive stage. Unlike Mt. Etna, flank degassing on Kilauea is restricted to the
tectonic and volcanic structures directly connected to the magma reservoir feeding the ongoing East Rift eruption or in areas
of the Lower East Rift where other shallow, likely independent reservoirs are postulated. Anomalous soil degassing was also
found in areas without surface evidence of faults, thus suggesting the possibility of previously unknown structures.
Received: November 2003, revised: January 2005, accepted: January 2005 |
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| Keywords: | Soil CO2 Kilauea volcanic degassing tectonic structures geochemical surveying |
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