Journal
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
Volume 194, Issue 4, Pages 139-149Publisher
ELSEVIER
DOI: 10.1016/j.jvolgeores.2010.04.011
Keywords
plate boundary; geothermal fields; man-made subsidence; triggered earthquakes; Interferometric Synthetic Aperture Radar (InSAR)
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Funding
- University of Iceland
- Icelandic Research Fund
- University of Arizona
- NSF
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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. (C) 2010 Elsevier B.V. All rights reserved.
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