Near-fault strong-motion array recordings of the M w6.3 Ölfus earthquake on 29 may 2008 in Iceland

Benedikt Halldórsson*, Ragnar Sigbjörnsson, Andrew A. Chanerley, Nicholas A. Alexander

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

3 Citations (Scopus)

Abstract

The M w6.3 Ölfus earthquake occurred on 29 May 2008 in the westernmost part of the South Iceland Seismic Zone. The event took place on two separate and parallel faults that ruptured nearly simultaneously. The earthquake strong-motion was recorded on 11 stations of the ICEARRAY, the first small-aperture strongmotion array in Iceland. The array has an aperture of ~1.9 km, minimum interstation distance of ~50 m and consists of CUSP-3Clp three-component accelerographs of Canterbury Seismic Instruments. The ICEARRAY recordings, being in the extreme near-fault region of one of the causative faults (r JB~1-2 km), exhibit high-intensity ground motion of short duration (4-5 s), large horizontal peak ground accelerations (38-88%g) and large amplitude, long-period velocity components, characteristics of near-fault motions, both on the strike-normal and strike-parallel components. The linear response spectra indicate that the longperiod energy of the velocity pulse seen along the strike-normal direction is not present in the strike-parallel direction. Additionally, along the strike-normal direction, the Eurocode 8 "Type 2" design spectrum combined with a recently published design spectrum for near-fault pulses appears to capture well the overall spectral composition of the ICEARRAY response spectra. The acceleration time histories have been corrected based on a novel wavelet transformation approach and integrated to velocity and displacement. The correction reveals that both the strike-normal and strike-parallel components are associated with significant permanent tectonic displacement. The displacement estimates are in accordance with GPS measurements in the region.

Original languageEnglish
Title of host publication9th US National and 10th Canadian Conference on Earthquake Engineering 2010, Including Papers from the 4th International Tsunami Symposium
Pages7536-7545
Number of pages10
Volume9
Publication statusPublished - 1 Dec 2010
Event9th US National and 10th Canadian Conference on Earthquake Engineering 2010, Including Papers from the 4th International Tsunami Symposium - Toronto, ON, United Kingdom
Duration: 25 Jul 201029 Jul 2010

Conference

Conference9th US National and 10th Canadian Conference on Earthquake Engineering 2010, Including Papers from the 4th International Tsunami Symposium
CountryUnited Kingdom
CityToronto, ON
Period25/07/1029/07/10

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