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GEOPHYSICAL RESEARCH LETTERS,
VOL. 36,
L12309,
5 PP., 2009
doi:10.1029/2009GL038391
A complex earthquake sequence captured by the continuous GPS network in SW Iceland
Department of Geosciences, University of Arizona, Tucson, Arizona, USA
Nordic Volcanological Center, Institute of Earth Sciences, University of Iceland, Reykjavík, Iceland
Nordic Volcanological Center, Institute of Earth Sciences, University of Iceland, Reykjavík, Iceland
Division of Processing and Research, Icelandic Meteorological Office, Reykjavík, Iceland
Department of Earth Sciences, Uppsala University, Uppsala, Sweden
Department of Geosciences, University of Arizona, Tucson, Arizona, USA
Department of Geosciences, Pennsylvania State University, University Park, Pennsylvania, USA
A complex sequence of earthquakes struck the western part of the South Iceland Seismic Zone (SISZ) on 29 May 2008. The sequence initiated with a M w6.3 (NEIC) earthquake in the western part of the SISZ. Aftershocks from the earthquake delineate two parallel N–S trending structures 4 km apart, in addition to activity along an E-W zone further westward. Continuous GPS measurements can best be explained by right-lateral strike-slip motion on two parallel N–S trending faults, with little slip occurring on other structures illuminated by earthquake activity. We estimate a total moment release of M w6.2, with M w6.1 on the first rupture and M w6.0 on the second rupture. High rate (1 Hz) CGPS data from a near-field station suggest that the main asperity on the Kross fault ruptured within 3 s of the initial mainshock on the Ingólfsfjall fault.
Received 26 March 2009; accepted 21 May 2009; published 23 June 2009.
Citation: (2009), A complex earthquake sequence captured by the continuous GPS network in SW Iceland, Geophys. Res. Lett., 36, L12309, doi:10.1029/2009GL038391.
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