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 Mw6.3 (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 Mw6.2, with Mw6.1 on the first rupture and Mw6.0 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.
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Hreinsdóttir et al. (2009) studied this question.
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