A complex earthquake sequence captured by the continuous GPS network in SW Iceland

S. Hreinsdóttir; T. Árnadóttir; J. Decriem; H. Geirsson; A. Tryggvason; R. A. Bennett; Peter Christopher Lafemina

doi:10.1029/2009GL038391

A complex earthquake sequence captured by the continuous GPS network in SW Iceland

S. Hreinsdóttir, T. Árnadóttir, J. Decriem, H. Geirsson, A. Tryggvason, R. A. Bennett, Peter Christopher Lafemina

Geosciences

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21 Scopus citations

Abstract

A complex sequence of earthquakes struck the western part of the South Iceland Scismic 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.

Original language	English (US)
Article number	L12309
Journal	Geophysical Research Letters
Volume	36
Issue number	12
DOIs	https://doi.org/10.1029/2009GL038391
State	Published - Jun 1 2009

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All Science Journal Classification (ASJC) codes

Geophysics
Earth and Planetary Sciences(all)

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Hreinsdóttir, S., Árnadóttir, T., Decriem, J., Geirsson, H., Tryggvason, A., Bennett, R. A., & Lafemina, P. C. (2009). A complex earthquake sequence captured by the continuous GPS network in SW Iceland. Geophysical Research Letters, 36(12), [L12309]. https://doi.org/10.1029/2009GL038391

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abstract = "A complex sequence of earthquakes struck the western part of the South Iceland Scismic 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 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 Ing{\'o}lfsfjall fault.",

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AU - Árnadóttir, T.

AU - Decriem, J.

AU - Geirsson, H.

AU - Tryggvason, A.

AU - Bennett, R. A.

AU - Lafemina, Peter Christopher

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10.1029/2009GL038391