Hydrothermal fluid flow triggered by an earthquake in Iceland
Geoffroy, Laurent; Dorbath, Catherine; Ágústsson, Kristján; Kristjánsdóttir, Sigríður; Flóvenz, Ólafur G.; Doubre, Cécile; Gudmundsson, Ólafur; Barreyre, Thibaut; Bazin, Sara; Franco, Aurore
Journal article, Peer reviewed
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https://hdl.handle.net/11250/3062134Utgivelsesdato
2022Metadata
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- Department of Earth Science [1096]
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Sammendrag
Microearthquake hypocenters were analyzed in the Krýsuvík geothermal area in SW-Iceland with data taken from two consecutive passive seismic surveys, 2005 and 2009. Five years prior to the 2005 survey, this area was struck by an earthquake initiating a major top-to-bottom fluid migration in the upper crust. We observe from our surveys a complex bottom-to-top migration of seismicity with time following this fluid penetration, suggesting the migration of a pore pressure front controlled by the upper-crust fracture system. We interpret these data as the time and space development of high-temperature hydrothermal cells from a deep upper crustal fluid reservoir in the supercritical field. These results provide an insight into the coupling mechanisms between active tectonics and fluid flow in upper-crustal extensional systems with high thermal flux.