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The May 29(th) 2008 earthquake aftershock sequence within the South Iceland Seismic Zone: Fault locations and source parameters of aftershocks
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.
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2010 (English)In: Jokull, ISSN 0449-0576, Vol. 60, 23-46 p.Article in journal (Refereed) Published
Abstract [en]

On May 29(th) 2008, two M-w similar to 6 earthquakes struck the western part of the South Iceland Seismic Zone. The first event was followed within seconds by a similar size event on a second fault similar to 5 km further west. Earthquakes, detected by a temporary network of 11 seismometers and three permanent SIL-network stations were located using an automated Coalescence Microseismic Mapping technique. The epicenters delineate two major and several smaller N-S faults as well as an E-W zone of activity stretching further west into the Reykjanes Peninsula Rift Zone. Fault plane solutions show right lateral strike slip mechanisms along the two major N-S faults and suggest both smaller N-S right-lateral strike slip faults further west as well as an E-W zone of left lateral strike slip fault. The aftershocks deepen from 3-5 kin in the north to 8-9 kin in the south, suggesting that the main faults dip southwards. A brief increase in aftershock seismicity is most likely caused by short-term static stress buildup on adjacent faults. The faulting is interpreted to be driven by the local stress due to transform motion between two parallel segments of the divergent plate boundary crossing Iceland.

Place, publisher, year, edition, pages
2010. Vol. 60, 23-46 p.
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:uu:diva-150739ISI: 000288232100003OAI: oai:DiVA.org:uu-150739DiVA: diva2:408492
Available from: 2011-04-05 Created: 2011-04-05 Last updated: 2011-04-05Bibliographically approved

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