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Hydrothermal fluid flow triggered by an earthquake in Iceland

Abstract : 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.
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https://hal-insu.archives-ouvertes.fr/insu-03684621
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Submitted on : Wednesday, June 1, 2022 - 4:30:25 PM
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Laurent Geoffroy, Catherine Dorbath, Kristján Ágústsson, Sigrídur Kristjánsdóttir, Ólafur G. Flóvenz, et al.. Hydrothermal fluid flow triggered by an earthquake in Iceland. Communications Earth & Environment, 2022, 3, ⟨10.1038/s43247-022-00382-0⟩. ⟨insu-03684621⟩

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