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

Research output: Contribution to journalArticle

19 Citations (Scopus)

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 Ingólfsfjall fault.

Original languageEnglish (US)
Article numberL12309
JournalGeophysical Research Letters
Volume36
Issue number12
DOIs
StatePublished - Jun 1 2009

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Iceland
GPS
earthquakes
earthquake
rupture
slip
asperity
aftershock
near fields
stations
moments
estimates

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

Cite this

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
Hreinsdóttir, S. ; Árnadóttir, T. ; Decriem, J. ; Geirsson, H. ; Tryggvason, A. ; Bennett, R. A. ; Lafemina, Peter Christopher. / A complex earthquake sequence captured by the continuous GPS network in SW Iceland. In: Geophysical Research Letters. 2009 ; Vol. 36, No. 12.
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Hreinsdóttir, S, Árnadóttir, T, Decriem, J, Geirsson, H, Tryggvason, A, Bennett, RA & Lafemina, PC 2009, 'A complex earthquake sequence captured by the continuous GPS network in SW Iceland', Geophysical Research Letters, vol. 36, no. 12, L12309. https://doi.org/10.1029/2009GL038391

A complex earthquake sequence captured by the continuous GPS network in SW Iceland. / Hreinsdóttir, S.; Árnadóttir, T.; Decriem, J.; Geirsson, H.; Tryggvason, A.; Bennett, R. A.; Lafemina, Peter Christopher.

In: Geophysical Research Letters, Vol. 36, No. 12, L12309, 01.06.2009.

Research output: Contribution to journalArticle

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Hreinsdóttir S, Árnadóttir T, Decriem J, Geirsson H, Tryggvason A, Bennett RA et al. A complex earthquake sequence captured by the continuous GPS network in SW Iceland. Geophysical Research Letters. 2009 Jun 1;36(12). L12309. https://doi.org/10.1029/2009GL038391