Plate boundary deformation and man-made subsidence around geothermal fields on the Reykjanes Peninsula,Iceland |
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| Authors: | M. Keiding,T. Á rnadó ttir,S. Jó nsson,J. Decriem,A. Hooper |
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| Affiliation: | 1. Nordic Volcanological Centre, Institute of Earth Sciences, University of Iceland, Iceland;2. Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Saudi Arabia;3. Delft Institute of Earth Observation and Space Systems, Delft University of Technology, The Netherlands |
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| Abstract: | We present Interferometric Synthetic Aperture Radar (InSAR) data from 1992–1999 and 2003–2008 as well as GPS data from 2000–2009 for the active plate boundary on the Reykjanes Peninsula, southwest Iceland. The geodetic data reveal deformation mainly due to plate spreading, anthropogenic subsidence caused by geothermal fluid extraction and, possibly, increasing pressure in a geothermal system. Subsidence of around 10 cm is observed during the first 2 years of production at the Reykjanes geothermal power plant, which started operating in May 2006. We model the surface subsidence around the new power plant using point and ellipsoidal pressure sources in an elastic halfspace. Short-lived swarms of micro-earthquakes as well as aseismic fault movement are observed near the geothermal field following the start of production, possibly triggered by the stresses induced by geothermal fluid extraction. |
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| Keywords: | plate boundary geothermal fields man-made subsidence triggered earthquakes Interferometric Synthetic Aperture Radar (InSAR) |
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