Remote sensing of thermal emission and degassing at Villarrica Volcano, Chile

Bredemeyer, Stefan, Hansteen, Thor H., Garofalo, Kristin, Mora Stock, Cindy, Rabbel, Wolfgang and Gil Cruz, F. (2011) Remote sensing of thermal emission and degassing at Villarrica Volcano, Chile [Talk] In: AGU Fall Meeting 2011, 05.12.-09.12.2011, San Francisco, California, USA.

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Villarrica is one of the most active volcanoes in Chile and is presently characterized by activity from open continuously degassing conduit. The twohundred meter diameter crater contains a persistent lava lake which has a diameter of approximately ten meters. For the quantification of SO2 fluxes three stationary NOVAC-type scanning Mini-DOAS UV spectrometers were installed at the volcano in March 2009. To validate the ground-based gas measurements we compared them to thermal anomalies detected by the MODVOLC algorithm which is provided by the Hawai'i Institute of Geophysics and Planetology ( The MODVOLC algorithm (WRIGHT et al., 2002) uses data from the space-based Moderate Resolution Imaging Spectroradiometer (MODIS) onboard the National Aeronautics and Space Administration’s Terra and Aqua platforms and it exhibits the possibility to monitor volcanic heat sources. Although it was not intended to detect low intensity activity from open vent degassing, we find that in the case of Villarrica the detected thermal anomalies seem to originate from the heat carried by the gas phase. Additionally we have registered correlation between SO2 fluxes and thermal activity during the whole period of our ground-based gas-monitoring. Thermal anomalies detected by the MODVOLC algorithm coincide with observed periods of increased gas flux, enabling us to estimate gas fluxes indirectly from thermal data.

Wright R. et al. (2002) Remote Sensing of Environment 82, 135-155

Document Type: Conference or Workshop Item (Talk)
Keywords: Volcanology; Volcano monitoring; volcanic gases
Research affiliation: Kiel University
OceanRep > SFB 574
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-MUHS Magmatic and Hydrothermal Systems
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Date Deposited: 10 Feb 2012 11:15
Last Modified: 28 Feb 2013 12:41

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