The 1999 (Mw 7.1) Hector Mine, California, Earthquake: Near-Field Postseismic Deformation from ERS Interferometry

Jacobs, Allison; Sandwell, David T.; Fialko, Yuri; Sichoix, Lydie

doi:10.1785/0120000908

Cited by 76 publications

(72 citation statements)

References 30 publications

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“…These values generally agree with the seismic moment estimates of 4 to 6 ‫ן‬ 10 19 N m (e.g., Harvard centroid moment tensor [CMT] solution; Dreger and Kaverina, 2000). The inferred geodetic moment is expected to be somewhat larger than the seismic moment due to postseismic afterslip during 1 month following the earthquake (Jacobs et al, 2002). That most of the strike-slip motion due to the earthquake occurs in the northern section of the fault is corroborated by the 3D surface displacement fields derived from the InSAR data (Fialko et al, 2001).…”

Section: Discussionsupporting

confidence: 78%

“…We evaluate the similarity of interferograms by calculating the root mean square (rms) difference between a particular interferogram and all the remaining pairs. To account for a small yet detectable postseismic deformation (Jacobs et al, 2002), we subtract the postseismic interferometric pair 2000/ 07/26-1999/10/20 from all interferometric pairs shown in Table 1 except the short-term IP1. Before we calculate the rms difference, the phase difference is detrended by subtracting a planar ramp that best fits the entire radar scene.…”

Section: Inversion Of Insar and Gps Data For Subsurface Slip Distribumentioning

confidence: 99%

“…Because slave images in both IP2 and IP3 were acquired in late November, 1999, they include some postseismic deformation that has occurred within 1 month after the earthquake. Analysis of postseismic InSAR and continuous GPS data indicates that the corresponding postseismic deformation constitutes a negligible fraction of the coseismic signal (Jacobs et al, 2002).…”

Section: Inversion Of Insar and Gps Data For Subsurface Slip Distribumentioning

confidence: 99%

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Coseismic Deformation from the 1999 Mw 7.1 Hector Mine, California, Earthquake as Inferred from InSAR and GPS Observations

Simons¹

2002

Bulletin of the Seismological Society of America

408

354

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We use interferometric synthetic aperture radar (InSAR) and Global Positioning System (GPS) observations to investigate static deformation due to the 1999 M w 7.1 Hector Mine earthquake, that occurred in the eastern California shear zone. Interferometric decorrelation, phase, and azimuth offset measurements indicate regions of surface and near-surface slip, which we use to constrain the geometry of surface rupture. The inferred geometry is spatially complex, with multiple strands. The southern third of the rupture zone consists of three subparallel segments extending about 20 km in length in a N45ЊW direction. The central segment is the simplest, with a single strand crossing the Bullion Mountains and a strike of N10ЊW. The northern third of the rupture zone is characterized by multiple splays, with directions subparallel to strikes in the southern and central. The average strike for the entire rupture is about N30ЊW. The interferograms indicate significant alongstrike variations in strain which are consistent with variations in the ground-based slip measurements. Using a variable resolution data sampling routine to reduce the computational burden, we invert the InSAR and GPS data for the fault geometry and distribution of slip. We compare results from assuming an elastic half-space and a layered elastic space. Results from these two elastic models are similar, although the layered-space model predicts more slip at depth than does the half-space model. The layered model predicts a maximum coseismic slip of more than 5 m at a depth of 3 to 6 km. Contrary to preliminary reports, the northern part of the Hector Mine rupture accommodates the maximum slip. Our model predictions for the surface fault offset and total seismic moment agree with both field mapping results and recent seismic models. The inferred shallow slip deficit is enigmatic and may suggest that distributed inelastic yielding occurred in the uppermost few kilometers of the crust during or soon after the earthquake.

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Section: Discussionsupporting

confidence: 78%

Section: Inversion Of Insar and Gps Data For Subsurface Slip Distribumentioning

confidence: 99%

Section: Inversion Of Insar and Gps Data For Subsurface Slip Distribumentioning

confidence: 99%

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Coseismic Deformation from the 1999 Mw 7.1 Hector Mine, California, Earthquake as Inferred from InSAR and GPS Observations

Simons¹

2002

Bulletin of the Seismological Society of America

408

354

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“…For large earthquakes, the post-seismic effects can last from months to years, and the InSAR time-series approach can be effectively used to describe the crustal displacement time evolution [28]. While the observed displacement is interpreted in terms of after-slip over the seismogenic fault, the Okada solutions can be used to model the signal [45]. However, for long-term deformation, visco-elastic models should be used [42].…”

Section: Seismic Cycle Imaging and Modelingmentioning

confidence: 99%

SAR Data Analysis in Solid Earth Geophysics: From Science to Risk Management

Atzori¹,

Salvi²

2014

Land Applications of Radar Remote Sensing

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“…From previous investigations, it is evident that differential interferograms carry significant amounts of useful data in the studies of phenomena such as surface deformations due to seismic events (JACOBS et al, 2002;MASSONNET et al, 1993, MASSONNET andFEIGL, 1998) and volcanic activities (FERNÁ NDEZ et al, 2005), mining subsidence (GOURMELEN et al, 2007) or groundwater extraction (SCHMIDT and BÜ RGMANN, 2003;BAWDEN et al, 2001, WATSON et al 2002. Different types of errors are also present in the interferograms and these need to be estimated and, if possible, corrected.…”

Section: Datamentioning

confidence: 99%

An Elliptical Model for Deformation Due to Groundwater Fluctuations

Tiampo

Ouegnin

Valluri

et al. 2011

Pure Appl. Geophys.

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Abstract-Historically, surface subsidence as a result of subsurface groundwater fluctuations have produced important and, at times, catastrophic effects, whether natural or anthropogenic. Over the past 30 years, numerical and analytical techniques for the modeling of this surface deformation, based upon elastic and poroelastic theory, have been remarkably successful in predicting the magnitude of that deformation (LE MOUÉLIC and ADRAGNA in Geophys Res Lett 29:1853, 2002). In this work we have extended the formula for a circular-shaped aquifer (Geertsma in J Petroleum Tech 25: [734][735][736][737][738][739][740][741][742][743][744] 1973) to a more realistic elliptical shape. We have improved the accuracy of the approximation by making use of the cross terms of the expansion for the elliptic coordinates in terms of the eccentricity, e, and the mean anomaly angle, M, widely used in astronomy. Results of a number of simulations, in terms of e and M developed from the transcendental Kepler equation, are encouraging, giving realistic values for the elliptical approximation of the vertical deformation due to groundwater change. Finally, we have applied the algorithm to modeling of groundwater in southern California.

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The 1999 (Mw 7.1) Hector Mine, California, Earthquake: Near-Field Postseismic Deformation from ERS Interferometry

Cited by 76 publications

References 30 publications

Coseismic Deformation from the 1999 Mw 7.1 Hector Mine, California, Earthquake as Inferred from InSAR and GPS Observations

Coseismic Deformation from the 1999 Mw 7.1 Hector Mine, California, Earthquake as Inferred from InSAR and GPS Observations

SAR Data Analysis in Solid Earth Geophysics: From Science to Risk Management

An Elliptical Model for Deformation Due to Groundwater Fluctuations

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