Source parameters of the 1 October 1995 Dinar (Turkey) earthquake from SAR interferometry and seismic bodywave modelling

Wright, Tim; Parsons, B.; Jackson, James; Haynes, Mark; Fielding, E. J.; England, Philip; Clarke, Peter J.

doi:10.1016/s0012-821x(99)00186-7

Cited by 160 publications

(136 citation statements)

References 37 publications

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“…[13] This simple non-linear inversion is solved using a hybrid downhill simplex, Monte-Carlo inversion scheme [Clarke et al, 1997;Wright et al, 1999] and takes less than 1 second to run on a standard desktop computer.…”

Section: Inversion Methodologymentioning

confidence: 99%

Real‐time, reliable magnitudes for large earthquakes from 1 Hz GPS precise point positioning: The 2011 Tohoku‐Oki (Japan) earthquake

Wright

Houlié

Hildyard

et al. 2012

Geophysical Research Letters

124

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The early warning issued after the onset of the Mw9.0 Tohoku‐Oki earthquake significantly underestimated its magnitude, saturating, 120 seconds after the earthquake began, at Mw8.1. Here we investigate whether real‐time deformation data from Japan's dense network of continuously‐recording Global Positioning System (GPS) stations could have been used to provide a more reliable rapid estimate of the earthquake's magnitude, and ultimately a more robust tsunami forecast. We use precise point positioning in real‐time mode with broadcast clock and orbital corrections to give station positions every 1 s. We then carry out a simple static inversion on a subset of stations to determine the portion of the fault that slipped and the earthquake magnitude. Unlike most previous methods, our method produces estimates of seismic moment before the earthquake rupture has completed. We find that the deformation data allow a robust magnitude estimate just ∼100 s after the earthquake onset. We also investigated the density of stations required for a robust moment magnitude estimate. Fewer than 1 station every 100 km are needed. We recommend that GPS data be incorporated into earthquake early warning systems for regions at threat from large magnitude earthquakes and tsunamis.

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Section: Inversion Methodologymentioning

confidence: 99%

Real‐time, reliable magnitudes for large earthquakes from 1 Hz GPS precise point positioning: The 2011 Tohoku‐Oki (Japan) earthquake

Wright

Houlié

Hildyard

et al. 2012

Geophysical Research Letters

124

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“…The method is often highly successful, particularly when assessing coseismic deformation (Wright et al 1999;Chang et al 2004), where the amount of deformation is often on the order of meters. However, when the amount of deformation is small and distributed over time, the temporal decorrelation of radar signals can often affect DInSAR results wherein no meaningful information can be extracted.…”

Section: Ps and Small Baselinementioning

confidence: 99%

Investigating Active Deformation in the Northern Longitudinal Valley and City of Hualien in Eastern Taiwan Using Persistent Scatterer and Small-Baseline SAR Interferometry

Yen¹,

Lu²,

Chang³

et al. 2011

Terr. Atmos. Ocean. Sci.

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Rapid convergence between the Eurasian plate and the Philippine Sea plate in the northern Longitudinal Valley near the city of Hualien in eastern Taiwan has produced prominent fault scarps and large earthquakes (M ≥ 7). This study attempts to more thoroughly understand the surface deformation activities near the faults and their relation to earthquakes near Hualien City using a stable target, multi-temporal radar interferometry method to extract the surface deformation information in this area. Our results indicate that the extracted deformation signals were comparable with those in our leveling data and have a very high spatial density (exceeding 70 point km -2 ). Additionally, all faults in the northern Longitudinal Valley and Hualien City were not deformed monotonically. Rather, deformation time series are complex and frequent activities affected the general trends wherein, for example, 2005 earthquake swarm produced more than 10 mm of displacement near the Milun fault. Moreover, deformation rates in the study area generally ranged from around 10 -20 mm yr -1 of relative displacement rates along the radar line of sight between the western part of Hualien City near the Central Range and the eastern part during the decade, while only the Mingyi fault displayed monotonic fault activities with change of displacement rates of approximately 5 -10 mm yr -1 across the fault.

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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

152

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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Source parameters of the 1 October 1995 Dinar (Turkey) earthquake from SAR interferometry and seismic bodywave modelling

Cited by 160 publications

References 37 publications

Real‐time, reliable magnitudes for large earthquakes from 1 Hz GPS precise point positioning: The 2011 Tohoku‐Oki (Japan) earthquake

Real‐time, reliable magnitudes for large earthquakes from 1 Hz GPS precise point positioning: The 2011 Tohoku‐Oki (Japan) earthquake

Investigating Active Deformation in the Northern Longitudinal Valley and City of Hualien in Eastern Taiwan Using Persistent Scatterer and Small-Baseline SAR Interferometry

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

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