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Thermal monitoring of hydrothermal activity by permanent infrared automatic stations: Results obtained at Solfatara di Pozzuoli, Campi Flegrei (Italy)

Identifieur interne : 000134 ( Main/Exploration ); précédent : 000133; suivant : 000135

Thermal monitoring of hydrothermal activity by permanent infrared automatic stations: Results obtained at Solfatara di Pozzuoli, Campi Flegrei (Italy)

Auteurs : G. Chiodini [Italie] ; G. Vilardo [Italie] ; V. Augusti [Italie] ; D. Granieri [Italie] ; S. Caliro [Italie] ; C. Minopoli [Italie] ; C. Terranova [Italie]

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RBID : ISTEX:B0FEAC24FAEB799E65FCA96E67779AE53B8543DA

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English descriptors

Abstract

A permanent automatic infrared (IR) station was installed at Solfatara crater, the most active zone of Campi Flegrei caldera. After a positive in situ calibration of the IR camera, we analyze 2175 thermal IR images of the same scene from 2004 to 2007. The scene includes a portion of the steam heated hot soils of Solfatara. The experiment was initiated to detect and quantify temperature changes of the shallow thermal structure of a quiescent volcano such as Solfatara over long periods. Ambient temperature is the main parameter affecting IR temperatures, while air humidity and rain control image quality. A geometric correction of the images was necessary to remove the effects of slow movement of the camera. After a suitable correction the images give a reliable and detailed picture of the temperature changes, over the period October 2004 to January 2007, which suggests that origin of the changes were linked to anthropogenic activity, vegetation growth, and the increase of the flux of hydrothermal fluids in the area of the hottest fumaroles. Two positive temperature anomalies were registered after the occurrence of two seismic swarms which affected the hydrothermal system of Solfatara in October 2005 and October 2006. It is worth noting that these signs were detected in a system characterized by a low level of activity with respect to systems affected by real volcanic crisis where more spectacular results will be expected. Results of the experiment show that this kind of monitoring system can be a suitable tool for volcanic surveillance.

Url:
DOI: 10.1029/2007JB005140


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<term>Automatic stations</term>
<term>Average energy release</term>
<term>Average temperature</term>
<term>Average values</term>
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<term>Fumarolic fluids</term>
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<term>Main fumarolic area</term>
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<term>Slow temperature changes</term>
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<term>Solfatara fumarolic field</term>
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<term>Standard deviation</term>
<term>Steam velocity</term>
<term>Such energy fluxes</term>
<term>Suitable tool</term>
<term>Surface temperatures</term>
<term>Surveillance center</term>
<term>T_target</term>
<term>Temperature anomalies</term>
<term>Temperature changes</term>
<term>Temperature decreases</term>
<term>Temperature increase</term>
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<front>
<div type="abstract">A permanent automatic infrared (IR) station was installed at Solfatara crater, the most active zone of Campi Flegrei caldera. After a positive in situ calibration of the IR camera, we analyze 2175 thermal IR images of the same scene from 2004 to 2007. The scene includes a portion of the steam heated hot soils of Solfatara. The experiment was initiated to detect and quantify temperature changes of the shallow thermal structure of a quiescent volcano such as Solfatara over long periods. Ambient temperature is the main parameter affecting IR temperatures, while air humidity and rain control image quality. A geometric correction of the images was necessary to remove the effects of slow movement of the camera. After a suitable correction the images give a reliable and detailed picture of the temperature changes, over the period October 2004 to January 2007, which suggests that origin of the changes were linked to anthropogenic activity, vegetation growth, and the increase of the flux of hydrothermal fluids in the area of the hottest fumaroles. Two positive temperature anomalies were registered after the occurrence of two seismic swarms which affected the hydrothermal system of Solfatara in October 2005 and October 2006. It is worth noting that these signs were detected in a system characterized by a low level of activity with respect to systems affected by real volcanic crisis where more spectacular results will be expected. Results of the experiment show that this kind of monitoring system can be a suitable tool for volcanic surveillance.</div>
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