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The timescale and mechanisms of fault sealing and water-rock interaction after an earthquake
Stockholm University, Faculty of Science, Department of Geology and Geochemistry. Geologi.
Stockholm University, Faculty of Science, Department of Geology and Geochemistry. Geologi.
Stockholm University, Faculty of Science, Department of Geology and Geochemistry. Geokemi.
2007 (English)In: Geofluids, Vol. 7, 427-440 p.Article in journal (Other (popular science, discussion, etc.)) Published
Abstract [en]

Hydrogeochemical monitoring of a basalt-hosted aquifer, which contains Ice Age meteoric water and is situated

at 1220 m below sea level in the Tjornes Fracture Zone, northern Iceland, has been ongoing since July 2002.

Based on hydrogeochemical changes following an earthquake of magnitude (Mw) 5.8 on 16 September 2002, we

constrained the timescales of post-seismic fault sealing and water–rock interaction. We interpret that the earthquake

ruptured a hydrological barrier, permitting a rapid influx of chemically and isotopically distinct Ice Age

meteoric water from a second aquifer. During the two subsequent years, we monitored a chemical and isotopic

recovery towards pre-earthquake aquifer compositions, which we interpret to have been mainly facilitated by

fault-sealing processes. This recovery was interrupted in November 2004 by a second rupturing event, which was

probably induced by two minor earthquakes and which reopened the pathway to the second aquifer. We conclude

that the timescale of fault sealing was approximately 2 years and that the approach to isotopic equilibrium

(from global meteoric water line) was approximately 18% after >10^4 years. Key words: earthquake, fault sealing, hydrogeochemistry, Iceland, Tjornes Fracture Zone, water–rock interaction

Place, publisher, year, edition, pages
2007. Vol. 7, 427-440 p.
Identifiers
URN: urn:nbn:se:su:diva-19908ISI: 000250263000005OAI: oai:DiVA.org:su-19908DiVA: diva2:186432
Available from: 2007-12-18 Created: 2007-12-18 Last updated: 2011-01-11Bibliographically approved

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Claesson, LillemorSkelton, AlasdairMörth, Carl-Magnus
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