Testing satellite and ground thermal imaging of low-temperature fumarolic fields: The dormant Nisyros Volcano (Greece)

Λάγιος, Ε.; Vassilopoulou, Spyridoula; Sakkas, Vassilis; Dietrich, Volker; Damiata, Brian N.; Ganas, Athanassios

doi:10.1016/j.isprsjprs.2007.07.003

Cited by 37 publications

(36 citation statements)

References 22 publications

(26 reference statements)

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“…These gave a direct view into the hydrogeological and hydrothermal system. Geochemical analyses Lagios et al, 2007) helped to characterize the system, and the fumaroles on Nisyros were investigated in detail Chiodini et al, 2002;Teschner et al, 2007).…”

Section: Hydrothermal Activitymentioning

confidence: 99%

“…This permeability contrast is attributed to diverse fracture density between the lithologies (Ambrosio et al, 2010). The deep permeable zone has a temperature range of 300-350 • C and the heat is provided by magmatic fluids (Caliro et al, 2005;Lagios et al, 2007). The deep permeable zone provides vapor to the shallow permeable zone, which has a temperature range of 150-260 • C (Chiodini et al, 2002, Lagios et al, 2007.…”

Section: Hydrothermal Activitymentioning

confidence: 99%

“…The deep permeable zone has a temperature range of 300-350 • C and the heat is provided by magmatic fluids (Caliro et al, 2005;Lagios et al, 2007). The deep permeable zone provides vapor to the shallow permeable zone, which has a temperature range of 150-260 • C (Chiodini et al, 2002, Lagios et al, 2007. Finally, Lagios et al (2007) proposed that a third still shallower reservoir exists and is fed by condensates.…”

Section: Hydrothermal Activitymentioning

confidence: 99%

“…This volcanic island has a long history of phreatic eruptions, the latest in 1871-1873 and 1887 , experiencing an episode of unrest in 1996-2001 (Papadopoulos et al, 1998;Chiodini et al, 2002;Sachpazi et al, 2002). The Stefanos crater is one of several phreatic craters on Nisyros, and is also the major contributor to the total heat budget of the island (Lagios et al, 2007;Ganas et al, 2010). Below we first introduce the study area, the infrared and soil analysis methods, followed by our results that allow an interpretation of how the permeability might control the appearance of thermal anomalies.…”

Section: Introductionmentioning

confidence: 99%

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The ring-shaped thermal field of Stefanos crater, Nisyros Island: a conceptual model

Pantaleo

Walter

2014

Solid Earth

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Abstract. Fumarole fields related to hydrothermal processes release the heat of the underground through permeable pathways. Thermal changes, therefore, are likely to depend also on the size and permeability variation of these pathways. There may be different explanations for the observed permeability changes, such as fault control, lithology, weathering/alteration, heterogeneous sediment accumulation/erosion and physical changes of the fluids (e.g., temperature and viscosity). A common difficulty, however, in surface temperature field studies at active volcanoes is that the parameters controlling the ascending routes of fluids are poorly constrained in general. Here we analyze the crater of Stefanos, Nisyros (Greece), and highlight complexities in the spatial pattern of the fumarole field related to permeability conditions. We combine high-resolution infrared mosaics and grain-size analysis of soils, aiming to elaborate parameters controlling the appearance of the fumarole field. We find a ring-shaped thermal field located within the explosion crater, which we interpret to reflect near-surface contrasts of the soil granulometry and volcanotectonic history at depth. We develop a conceptual model of how the ring-shaped thermal field formed at the Stefanos crater and similarly at other volcanic edifices, highlighting the importance of local permeability contrast that may increase or decrease the thermal fluid flux.

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Section: Hydrothermal Activitymentioning

confidence: 99%

Section: Hydrothermal Activitymentioning

confidence: 99%

Section: Hydrothermal Activitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The ring-shaped thermal field of Stefanos crater, Nisyros Island: a conceptual model

Pantaleo

Walter

2014

Solid Earth

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“…The Landsat maintains an observation cycle of 16 days. Its images have aided landslide, volcano, forest fire, oceanography, and agriculture monitoring systems (Sidjak 1999;Nichol and Wong 2005;Lagios et al 2007;Bédard et al 2008;Masek et al 2008). However, on 31 May 2003 as the satellite was in mid-orbit, its scan line corrector (SLC)-which makes adjustments for the curvature of the Earth's surface-failed.…”

Section: Introductionmentioning

confidence: 99%

An Effective Gap Filtering Method for Landsat ETM+ SLC-Off Data

Lee¹,

Cho²,

Lee³

2016

Terr. Atmos. Ocean. Sci.

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The Landsat 7 Enhanced Thematic Mapper Plus (ETM+) scan line corrector (SLC) failed on 31 May 2003, causing the SLC to turn off. Many gap-filled products were developed and deployed to combat this situation. The majority of these products used a primary image taken by the SLC when functioning properly in an attempt to correct SLC-off images. However, temporal atmospheric elements could not be reliably reflected using a primary image, and therefore the corrected image was not viable for use by monitoring systems. To bypass this limitation, this study has developed the Gap Interpolation and Filtering (GIF) method that relies on one-dimensional interpolation filtering to conveniently recover pixels within a single image at a high level of accuracy without borrowing from images acquired at a different time or by another sensor. The GIF method was compared to two other methods-Global Linear Histogram Match (GLHM), and the Local Linear Histogram Match (LLHM)-both developed by National Aeronautics and Space Administration (NASA) and United States Geological Survey (USGS) to determine its accuracy. The GIF method accuracy was found superior in land, sea, and cloud imaging. In particular, its sea and cloud images returned Root Mean Square Error (RMSE) values close to or less than 1. We expect the GIF method developed in this research to be of invaluable aid to monitoring systems that depend heavily on Landsat imagery.

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Long‐term TIR imagery processing for spatiotemporal monitoring of surface thermal features in volcanic environment: A case study in the Campi Flegrei (Southern Italy)

2015

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Different procedures were used to analyze a comprehensive time series of nighttime thermal infrared images acquired from October 2006 to June 2013 by a permanent station at Pisciarelli (Campi Flegrei, Italy). The methodologies were aimed at the detection and quantification of possible spatiotemporal changes in the ground-surface thermal features of an area affected by diffuse degassing. Long-term infrared time series images were processed without taking into account atmospheric conditions and emissivity estimations. The data obtained were compared with the trends of independent geophysical and geochemical parameters, which suggested that long-term temporal variations of the surface maximum temperatures were governed by the dynamics of the deeper hydrothermal system. Analogously, the dynamics of the shallow hydrothermal system are likely to control the short-period thermal oscillations that overlie the long-term thermal signals. The map of the yearly rates of temperature change shows temperature increases clustered in the thermal anomalous area of the infrared images, without evidence of modifications to the extension of the anomaly or of growth of new areas with significant thermal emission. This suggests that in the present state, the heat transfer is mainly due to hot gas emission through preexisting fractures and vents. Our data indicate that the comprehensive picture of the spatiotemporal evolution of the thermal features of the hydrothermal sites obtained by long-term infrared monitoring can provide useful information toward refining physical and conceptual models, as well as improving surveillance of active volcanoes.

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Testing satellite and ground thermal imaging of low-temperature fumarolic fields: The dormant Nisyros Volcano (Greece)

Cited by 37 publications

References 22 publications

The ring-shaped thermal field of Stefanos crater, Nisyros Island: a conceptual model

The ring-shaped thermal field of Stefanos crater, Nisyros Island: a conceptual model

An Effective Gap Filtering Method for Landsat ETM+ SLC-Off Data

Long‐term TIR imagery processing for spatiotemporal monitoring of surface thermal features in volcanic environment: A case study in the Campi Flegrei (Southern Italy)

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