[Folda] MSc thesis defense - Lucía?==?utf-8?q? Magali, Monday 12:20, Askja 132

[Siqi Li]

Hi,

Lucía Magali Ramírez González will have her Master's lecture this Monday 12:20 at Askja 132.

Time and location: Monday, January 29th, Room 132 Askja, 12:20 hrs

Title: Remote sensing of surface hydrothermal alteration, identification of minerals and thermal anomalies at Sveifluháls-Krýsuvík high-temperature geothermal field, SW Iceland

Abstract

This study used optical remote sensors to identify surface hydrothermal minerals and thermal anomalies in the Sveifluháls-Krýsuvík high-temperature geothermal field. The study area is located in a volcanic fissure swarm in the central Reykjanes peninsula, in southwest Iceland. The area is characterized by intensive surface alteration, steam vents, mud pots, and hot springs. Multispectral Landsat and ASTER satellite images were used to identify mineral alteration and thermal anomalies. A hyperspectral image from Hyperion was used for the analysis of absorption features. Spectral analysis from the visible (VIS) to the short wavelength infrared (SWIR) allowed the identification of possible sulfur, iron oxides and montmorillonite. A time series study of thermal anomalies using thermal infrared (TIR) satellite images from 2002 to 2017 detected extinct surface hydrothermal activity southwest of the study area, and a thermal anomaly possibly affected by crustal deformation in the southeast. In Seltún area, TIR images acquired by a camera on a drone were taken over the same target at different elevations, the data were compared with ground measurements, compared with ground measurements with the aim of assessing the accuracy of the data regarding the distance between the camera and the ground; the TIR image taken from 30m high was used to calculate radiative heat flux, values were in same order of magnitude than the heat flux estimated by using ground temperature measurements.
This study provides insights for monitoring natural or induced changes on the surface geothermal activity in other geothermal fields. 



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All the best,
Siqi