000007134 001__ 7134
000007134 005__ 20241106120522.0
000007134 0247_ $$2DOI$$a10.1029/2023JB027064
000007134 037__ $$aSCART-2024-0182
000007134 100__ $$aÇubuk-Sabuncu, Y.
000007134 245__ $$aTemporal Seismic Velocity Changes Associated With the Mw 6.1, May 2008 Ölfus Doublet, South Iceland: A Joint Interpretation From dv/v and GPS
000007134 260__ $$c2024
000007134 520__ $$aIn South Iceland, populated and agricultural areas are at risk of earthquakes due to their location within the South Iceland Seismic Zone (SISZ). In 2008, two moderate-sized earthquakes (M5.8 and M5.9) occurred in Ölfus, the western end of this highly active transform zone. We analyze temporal seismic velocity variations (dv/v) related to the Ölfus earthquake doublet, using cross-correlations of ambient noise in the frequency range of 0.1–3.0 Hz. The two mainshocks decrease the average velocity by 0.8% at the nearest stations. The co-seismic changes are most noticeable from 0.7 to 1.7 Hz and affect a 40 km wide region. We present a first-time comparison of dv/v to crustal deformation, seismicity, co-seismic volumetric stress changes and reported PGA distribution for the Ölfus doublet. Ground accelerations caused by mainshocks at intermediate distances suggest that strong shaking-related damage may contribute to the co-seismic dv/v decrease. A rapid velocity increase (0.3%) in a month after the co-seismic drop indicates crustal rock healing. We find 3-months of post-seismic decorrelation, followed by a nearly permanent velocity decrease (0.2%) confined to a shallow layer (1 km) until the end of the observation period. Afterslip and pore fluid effects in the near-source region are likely to influence post-seismic dv/v. We demonstrate that seismic interferometry can contribute to future fault-zone monitoring operations in the SISZ by detecting small changes in velocity.
000007134 536__ $$aIcelandic Centre for Research 217738-051, 185209-051/$$cIcelandic Centre for Research 217738-051, 185209-051/$$fIcelandic Centre for Research 217738-051, 185209-051
000007134 594__ $$aNO
000007134 6531_ $$aearthquake
000007134 6531_ $$atriggering
000007134 6531_ $$avelocity variation
000007134 6531_ $$ainterferometry
000007134 6531_ $$adeformation
000007134 700__ $$aJónsdóttir, K.
000007134 700__ $$aÁrnadóttir, T.
000007134 700__ $$aMordret, A.
000007134 700__ $$aCaudron, C.
000007134 700__ $$aLecocq, T.
000007134 700__ $$aDe Plaen, R.
000007134 773__ $$ne2023JB027064$$pJournal of Geophysical Research: Solid Earth$$v129$$y2024
000007134 8560_ $$fthomas.lecocq@ksb-orb.be
000007134 8564_ $$s415906$$uhttp://publi2-as.oma.be/record/7134/files/jgrb56700-fig-0002-m.jpg$$yVelocity Variations observed around the Ölfus Doublet (wavelet-based dv/v)
000007134 8564_ $$s12986$$uhttp://publi2-as.oma.be/record/7134/files/jgrb56700-fig-0002-m.jpg?subformat=icon-180$$xicon-180$$yVelocity Variations observed around the Ölfus Doublet (wavelet-based dv/v)
000007134 8564_ $$s16854$$uhttp://publi2-as.oma.be/record/7134/files/jgrb56700-fig-0002-m.gif?subformat=icon$$xicon$$yVelocity Variations observed around the Ölfus Doublet (wavelet-based dv/v)
000007134 85642 $$ahttps://doi.org/10.1029/2023JB027064
000007134 905__ $$apublished in
000007134 980__ $$aREFERD