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A complex earthquake sequence captured by the continuous GPS network in SW Iceland
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2009 (English)In: Geophysical Research Letters, ISSN 0094-8276, Vol. 36, no 12, L12309- p.Article in journal (Refereed) Published
Abstract [en]

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(w)6.3 (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(w)6.2, with M(w)6.1 on the first rupture and M(w)6.0 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 Ingolfsfjall fault. Citation: Hreinsdottir, S., T. Amadottir, J. Decriem, H. Geirsson, A. Tryggvason, R. A. Bennett, and P. LaFemina (2009), A complex earthquake sequence captured by the continuous GPS network in SW Iceland, Geophys. Res. Lett., 36, L12309, doi: 10.1029/2009GL038391.

Place, publisher, year, edition, pages
2009. Vol. 36, no 12, L12309- p.
Keyword [en]
Iceland, high-rate GPS, earthquake
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:uu:diva-128395DOI: 10.1029/2009GL038391ISI: 000267489300004OAI: oai:DiVA.org:uu-128395DiVA: diva2:331521
Available from: 2010-07-23 Created: 2010-07-20 Last updated: 2013-04-08Bibliographically approved

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Tryggvason, Ari

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