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

Research output: Contribution to journal › Article › peer-review

25 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

All Science Journal Classification (ASJC) codes

Geophysics
Earth and Planetary Sciences(all)

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10.1029/2009GL038391

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title = "A complex earthquake sequence captured by the continuous GPS network in SW Iceland",

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.",

author = "S. Hreinsd{\'o}ttir and T. {\'A}rnad{\'o}ttir and J. Decriem and H. Geirsson and A. Tryggvason and Bennett, {R. A.} and Lafemina, {Peter Christopher}",

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AU - Hreinsdóttir, S.

AU - Árnadóttir, T.

AU - Decriem, J.

AU - Geirsson, H.

AU - Tryggvason, A.

AU - Bennett, R. A.

AU - Lafemina, Peter Christopher

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