Fault slip distribution of two June 2000 M W 6.5 earthquakes in South Iceland estimated from joint inversion of InSAR and GPS measurements

Pedersen, R.; Jónsson, Sigurjón; Árnadóttir, Þóra; Sigmundsson, Freysteinn; Feigl, K. L.

doi:10.1016/s0012-821x(03)00302-9

Cited by 131 publications

(123 citation statements)

References 28 publications

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“…The maximum residual for both interferograms amounts to about 6 cm. Our measure of misfit which accounts for the number of model parameters P and number of data N, ffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi ffi WRSS=ðN À P Þ p , is 0.7, indicating that adequate fitting of the model to the data has been achieved (MENKE, 1989;AYHAN et al, 2001;PEDERSEN et al, 2003).…”

Section: Rupture Geometrymentioning

confidence: 99%

Combination of Precise Leveling and InSAR Data to Constrain Source Parameters of the Mw = 6.5, 26 December 2003 Bam Earthquake

Motagh

Klotz

Tavakoli

et al. 2006

Pure appl. geophys.

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Abstract-We used new precise leveling data acquired 40 days after the Bam earthquake in combination with radar interferometry observations from both ascending and descending orbits to investigate static deformation associated with the 2003 Bam earthquake. We invert this geodetic data set to gain insight into the fault geometry and slip distribution of the rupture. The best-fitting dislocation model is a steeply east-dipping right-lateral strike-slip fault that has a size of 11 by 8 km and strikes N2°W. We find that such smooth geometry fits available geodetic data better than previously proposed models for this earthquake. Our distributed slip model indicates a maximum strike slip of 3 m occurring about 3 to 5 km deep. The slip magnitude and depth of faulting taper to the north, where the fault approaches the Bam city. Inclusion of crustal layering increases the amount of maximum slip inferred at depth by about 4%.

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Section: Rupture Geometrymentioning

confidence: 99%

Combination of Precise Leveling and InSAR Data to Constrain Source Parameters of the Mw = 6.5, 26 December 2003 Bam Earthquake

Motagh

Klotz

Tavakoli

et al. 2006

Pure appl. geophys.

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“…The current sequence started in 1987 May with a M S 5.8 earthquake in the transition zone between the eastern SISZ and the Eastern Volcanic Zone (Bjarnason & Einarsson 1991), continuing on 2000 June 17 and 21 with two M W ∼ 6.5 earthquakes in the central SISZ (Árnadóttir et al 2001;Pedersen et al 2003;Hjaltadóttir 2009). The 2008 May events occurred during a span of about three seconds, on two adjacent faults 4-5 km apart, close to the Hengill triple junction (Hreinsdóttir et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Temporal stress changes associated with the 2008 May 29M_W 6 earthquake doublet in the western South Iceland Seismic Zone

et al. 2015

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two magnitude M W ∼ 6 earthquakes occurred on two adjacent N-S faults in the western South Iceland Seismic Zone. The first main shock was followed approximately 3 s later by the rupture on a parallel fault, about 5 km to the west. An intense aftershock sequence was mostly confined to the western fault and an E-W aligned zone, extending west of the main shock region into the Reykjanes oblique rift. In this study, a total of 325 well-constrained focal mechanisms were obtained using data from the permanent Icelandic SIL seismic network and a temporary network promptly installed in the source region following the main shocks, which allowed a high-resolution stress inversion in short time intervals during the aftershock period. More than 800 additional focal mechanisms for the time period 2001-2009, obtained from the permanent SIL network, were analysed to study stress changes associated with the main shocks. Results reveal a coseismic counter-clockwise rotation of the maximum horizontal stress of 11 ± 10 • (95 per cent confidence level) in the main rupture region. From previous fault models obtained by inversion of geodetic data, we estimate a stress drop of about half of the background shear stress on the western fault. With a stress drop of 8-10 MPa, the pre-event shear stress is estimated to 16-20 MPa. The apparent weakness of the western fault may be caused by fault properties, pore fluid pressure and the vicinity of the fault to the western rift zone, but may also be due to the dynamic stress increase on the western fault by the rupture on the eastern fault. Further, a coseismic change of the stress regime-from normal faulting to strike-slip faulting-was observed at the northern end of the western fault. This change could be caused by stress heterogeneities, but may also be due to a southward shift in the location of the aftershocks as compared to prior events.

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“…Faulting along conjugate faults was also observed, but was less pronounced Einarsson and Saemundsson (1987), recent fissures and faults are from Einarsson (2010), and source faults of historical earthquakes are based on fault mapping and investigation of historical documents (Modified from Sólnes et al (2013) with the help of GBG at IMO) than the main rupture zones. Faulting extended to a depth of about 10 km as shown by aftershock distribution and modeling of displacement fields at the surface determined by GPS and InSAR measurements (Árnadóttir et al 2001;Pedersen et al 2003). The maximum fault displacements according to these models were 2.5 m for both earthquakes.…”

Section: South Iceland Seismic Zonementioning

confidence: 88%

Mechanisms of Earthquakes in Iceland

Einarsson

2014

Encyclopedia of Earthquake Engineering

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Fault slip distribution of two June 2000 M W 6.5 earthquakes in South Iceland estimated from joint inversion of InSAR and GPS measurements

Cited by 131 publications

References 28 publications

Combination of Precise Leveling and InSAR Data to Constrain Source Parameters of the Mw = 6.5, 26 December 2003 Bam Earthquake

Combination of Precise Leveling and InSAR Data to Constrain Source Parameters of the Mw = 6.5, 26 December 2003 Bam Earthquake

Temporal stress changes associated with the 2008 May 29M_W 6 earthquake doublet in the western South Iceland Seismic Zone

Mechanisms of Earthquakes in Iceland

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Fault slip distribution of two June 2000 M W 6.5 earthquakes in South Iceland estimated from joint inversion of InSAR and GPS measurements

Cited by 131 publications

References 28 publications

Combination of Precise Leveling and InSAR Data to Constrain Source Parameters of the Mw = 6.5, 26 December 2003 Bam Earthquake

Combination of Precise Leveling and InSAR Data to Constrain Source Parameters of the Mw = 6.5, 26 December 2003 Bam Earthquake

Temporal stress changes associated with the 2008 May 29MW 6 earthquake doublet in the western South Iceland Seismic Zone

Mechanisms of Earthquakes in Iceland

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Temporal stress changes associated with the 2008 May 29M_W 6 earthquake doublet in the western South Iceland Seismic Zone