Near real‐time radar interferometry of the Mw 7.1 Hector Mine Earthquake

Sandwell, David T.; Sichoix, Lydie; Agnew, Duncan Carr; Bock, Yehuda; Minster, J. B.

doi:10.1029/1999gl011209

Cited by 59 publications

(37 citation statements)

References 16 publications

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“…Previous studies have shown that some shallow slip may be triggered on faults as a result of nearby earthquakes 8,34,35 . However, the amount of such triggered slip (integrated over the earthquake cycle) is unlikely to account for the estimated slip deficit of the order 6 of meters.…”

Section: Nature Of the Shallow Slip Deficitmentioning

confidence: 99%

Three-dimensional deformation caused by the Bam, Iran, earthquake and the origin of shallow slip deficit

Fialko

Sandwell

Simons

et al. 2005

Nature

437

341

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Section: Nature Of the Shallow Slip Deficitmentioning

confidence: 99%

Three-dimensional deformation caused by the Bam, Iran, earthquake and the origin of shallow slip deficit

Fialko

Sandwell

Simons

et al. 2005

Nature

437

341

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“…On the basis of SAR interferometry, Sandwell et al (2000) reported that creep occurred on the San Andreas fault during the same approximate time frame as the Hector Mine mainshock. Such triggered slip is a wellknown phenomenon that has been repeatedly observed along this section of the San Andreas fault and other faults in the Salton Trough (e.g., Hudnut and Clark, 1989;Rymer, 2000;Rymer et al, 2002).…”

Section: Temporal Changesmentioning

confidence: 99%

Continuous GPS Observations of Postseismic Deformation Following the 16 October 1999 Hector Mine, California, Earthquake (Mw 7.1)

Hudnut¹,

King²,

Galetzka³

et al. 2002

Bulletin of the Seismological Society of America

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Rapid field deployment of a new type of continuously operating Global Positioning System (GPS) network and data from Southern California Integrated GPS Network (SCIGN) stations that had recently begun operating in the area allow unique observations of the postseismic deformation associated with the 1999 Hector Mine earthquake. Innovative solutions in fieldcraft, devised for the 11 new GPS stations, provide high-quality observations with 1-year time histories on stable monuments at remote sites. We report on our results from processing the postseismic GPS data available from these sites, as well as 8 other SCIGN stations within 80 km of the event (a total of 19 sites).

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“…In the presence of deformation having a characteristic wavelength on the order of, or exceeding the radar scene size, as is the case for the Hector Mine earthquake, removal of a best-fitting ramp may affect the long-wavelength part of the tectonic signal. Sandwell et al (2000) argue that the available orbits may be precise enough so that no flattening is required. We reduce the effects of orbit errors by solving for the best-fitting bilinear ramps in the data as a part of the inversion and using GPS measurements as ground truth.…”

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

confidence: 99%

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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Near real‐time radar interferometry of the Mw 7.1 Hector Mine Earthquake

Cited by 59 publications

References 16 publications

Three-dimensional deformation caused by the Bam, Iran, earthquake and the origin of shallow slip deficit

Three-dimensional deformation caused by the Bam, Iran, earthquake and the origin of shallow slip deficit

Continuous GPS Observations of Postseismic Deformation Following the 16 October 1999 Hector Mine, California, Earthquake (Mw 7.1)

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

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