Estimation of an earthquake focal mechanism from a satellite radar interferogram: Application to the December 4, 1992 Landers aftershock

Feigl, K. L.; Sergent, Arnaud; Jacq, D

doi:10.1029/94gl03212

Cited by 70 publications

(54 citation statements)

References 8 publications

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“…Geodetic inversions are a useful tool for estimating kinematic source parameters of earthquakes (e.g., Stein and Barrientos, 1985;Lin and Stein, 1989;Freymueller et al, 1994;Feigl et al, 1995;Yu and Segall, 1996;Wright et al, 1999;Reilinger et al, 2000). Using static surface displacements associated with a given earthquake researchers seek to better understand earthquake rupture processes by inverting for fault geometry and/or slip distributions.…”

Section: Introductionmentioning

confidence: 99%

Inverting for Slip on Three-Dimensional Fault Surfaces Using Angular Dislocations

Maerten

Resor

Pollard

et al. 2005

Bulletin of the Seismological Society of America

153

119

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Inverting for slip on three-dimensional fault surfaces using angular dislocations" Bulletin Of The Seismological Society Of America 95.5 (2005): 1654-1665. 1654Bulletin of the Seismological Society of America, Vol. 95, No. 5, pp. 1654-1665, October 2005, doi: 10.1785 Most common methods of inversion use rectangular dislocation segments to model fault ruptures and therefore oversimplify fault geometries. These geometric simplifications can lead to inconsistencies when inverting for slip on earthquake faults, and they preclude a more complete understanding of the role of fault geometry in the earthquake process.We have developed a new three-dimensional slip-inversion method based on the analytical solution for an angular dislocation in a linear-elastic, homogeneous, isotropic, half-space. The approach uses the boundary element code Poly3D that employs a set of planar triangular elements of constant displacement discontinuity to model fault surfaces. The use of triangulated surfaces as discontinuities permits one to construct fault models that better approximate curved three-dimensional surfaces bounded by curved tiplines: shapes that commonly are imaged by three-dimensional reflection seismic data and inferred from relocated aftershock data.We demonstrate the method's ability to model three-dimensional rupture geometries by inverting for slip associated with the 1999 Hector Mine earthquake. The resulting model avoids displacement anomalies associated with the overlapping rectangular dislocations used in previous models, improving the fit to the geodetic data by 32%, and honors the observed surface ruptures, thereby allowing more direct comparisons between geologic and geodetic data on slip distributions.

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Section: Introductionmentioning

confidence: 99%

Inverting for Slip on Three-Dimensional Fault Surfaces Using Angular Dislocations

Maerten

Resor

Pollard

et al. 2005

Bulletin of the Seismological Society of America

153

119

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show abstract

“…LOS deformation maps have become a nearly routine source of information useful for deriving statically accumulated slip models along the fault plane Vol. 166, 2009 SAR Derived Coseismic 3-D Deformation (e.g., FEIGL et al, 1995;JONSSON et al, 2002). To obtain model parameters, geophysical optimization or inverse modelling is applied (TARANTOLA, 2005).…”

Section: Elastic Modellingmentioning

confidence: 99%

Coseismic Three-Dimensional Displacements Determined Using SAR Data: Theory and an Application Test

González¹,

Fernández²,

Camacho³

2009

Pure appl. geophys.

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We present a methodology to construct three-dimensional deformation maps using different parameters that can be extracted using SAR data. We apply the methodology using ENVISAT SAR data before and after the December 26 th , 2003 M w 6.6 Bam earthquake in Iran to determine spatial quasi-continuous threedimensional coseismic deformation maps. Two near vertical deformation offset components are computed using Envisat ASAR differential interferometry (DInSAR), while two horizontal deformation offset components are measured using sub-pixel correlation techniques applied to ASAR amplitude images. Using the presented methodology, we combine four unevenly precise independent projections of surface coseismic deformation to obtain the full three-dimensional coseismic deformation field caused by an earthquake. The full 3-D coseismic displacement vector is modeled using elastic deformation models constraining details of the fault geometry and slip distribution at depth. Results from the inversion are interpreted in the framework of the Iranian present-day tectonism. Full exploitation of dense 3-D coseismic surface deformation using SAR data, even for moderate earthquakes, should facilitate distinguishing between different interpretations of the mechanical properties of seismically active areas and within the inherent ambiguity of the geophysical inversion solutions.

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“…The near-fault coseismic surface deformation observed using geodetic techniques, such as the Global Positioning System (GPS) and/or Interferometric Synthetic Aperture Radar (InSAR), is commonly utilized as a significant constraint for fault slip model inversion (Okada, 1985;Massonnet et al, 1993;Feigl et al, 1995;Hao et al, 2009;Shen et al, 2009;Chen et al, 2010Chen et al, , 2012Wang et al, 2011Wang et al, , 2014Zhao et al, 2011;Qu et al, 2014). The inversion approach based on geodetic data can be approximately separated into two steps.…”

Section: Introductionmentioning

confidence: 99%

Deep coseismic slip of the 2008 Wenchuan earthquake inferred from joint inversion of fault stress changes and GPS surface displacements

Chen

Yang

Luo

et al. 2015

Journal of Geodynamics

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Estimation of an earthquake focal mechanism from a satellite radar interferogram: Application to the December 4, 1992 Landers aftershock

Cited by 70 publications

References 8 publications

Inverting for Slip on Three-Dimensional Fault Surfaces Using Angular Dislocations

Inverting for Slip on Three-Dimensional Fault Surfaces Using Angular Dislocations

Coseismic Three-Dimensional Displacements Determined Using SAR Data: Theory and an Application Test

Deep coseismic slip of the 2008 Wenchuan earthquake inferred from joint inversion of fault stress changes and GPS surface displacements

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