Crustal structure and seismicity distribution adjacent to the Pacific and North America plate boundary in southern California

Hauksson, Egill

doi:10.1029/2000jb900016

Cited by 271 publications

(376 citation statements)

References 44 publications

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“…Variations in the effective elastic properties of the Earth's crust across mature faults are perhaps not surprising, as large-offset faults often juxtapose terrains with dissimilar compositions and mechanical properties 23 . However, the inferred magnitude of the rigidity contrasts exceeds high-end estimates from seismic tomography of a factor of 2-2.5 24,25 . The total inferred contrast across the San Andreas and San Jacinto faults is about a factor of 5 to 10, significantly larger than any seismically determined lateral variations in elastic moduli, but comparable to inferences based on geodetic data from other localities 15 .…”

mentioning

confidence: 91%

“…For example, the low slip rate Elsinore fault is expressed in significant microseismicity. Intense microseismicity is also associated with the faster moving San Jacinto, while the SAF characterized by the highest slip rate is practically devoid of microearthquakes 25,28 . These patterns exemplify extremely complex relationships between the tectonic loading rate and seismic activity.…”

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confidence: 98%

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Interseismic strain accumulation and the earthquake potential on the southern San Andreas fault system

Fialko

2006

Nature

386

361

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mentioning

confidence: 91%

mentioning

confidence: 98%

Interseismic strain accumulation and the earthquake potential on the southern San Andreas fault system

Fialko

2006

Nature

386

361

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“…The sharp changes seen in some of the other histograms suggests that locations may have a tendency to stick at particular depths. The Hauksson [2000] catalog is a notable exception, having a relatively smooth depth distribution.…”

Section: Event Depthsmentioning

confidence: 99%

“…In addition, their geographical distribution is also quite different from natural seismicity. Nonetheless, we compared the known locations of 58 such events [Hauksson, 2000] with the locations for the same events in the SCSN catalog and in our final catalog. In both cases, the median horizontal mislocation was -0750 m.…”

Section: '• O••!•••• (A)mentioning

confidence: 99%

Earthquake locations in southern California obtained using source‐specific station terms

Richards‐Dinger¹,

Shearer²

2000

J. Geophys. Res.

177

169

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Abstract. We relocate 297,400 events recorded by the Southern California Seismic Network (SCSN) between 1975 and 1998 using spatially varying station terms to improve relative location accuracy. Our method uses existing SCSN P and $ picks, a smooth one-dimensional velocity model, and an iterative grid search approach based on the L1 norm. We apply empirical corrections for three-dimensional structure by computing station timing corrections that continuously vary as a function of source position. Station terms for each event are obtained by smoothing the residuals from nearby events using a natural neighbor (Delaunay) tessellation of the seismicity and then iterating until a stable set of locations and station terms is achieved. Our approach achieves relative location accuracy comparable locally to master event methods but can be applied uniformly over large regions. Median estimated standard errors for our final locations are 328 m in horizontal position and 741 m in depth. Our locations exhibit much less scatter, particularly in depth, than those of the SCSN catalog and a greater tendency to align into linear and planar features suggestive of fault structures. Our results appear comparable to, and in some cases better than, previous SCSN relocation studies using joint-hypocentervelocity inversion techniques. Plots of daytime versus nighttime events permit discrimination between clusters of natural and artificial seismicity. We observe no simple relationship between the maximum depth of seismicity and surface geology.

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“…In the experiments performed here, a uniform velocity model of 6 km/sec is applied. Known variations can be incorporated, such as the soft sediments in the basin region, with a P-wave velocity of less than 4.0 km/sec (Hauksson, 2000). The modification suggested by Kao and colleagues is compatible with the RKL method presented here and could be tested to see whether it improves the location accuracy.…”

Section: Discussionmentioning

confidence: 90%

Real-time Earthquake Location Using Kirchhoff Reconstruction

Baker

Granat

Clayton

2005

Bulletin of the Seismological Society of America

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Real-time location of earthquakes can be achieved by using direct imaging of the recorded wave field based on a Kirchhoff reconstruction method similar to that used in the migration of seismic reflection data. The standard method of event location requires the wave arrival at each sensor to be picked and associated with an event. By using direct imaging, the event is identified once in the imaged wave field. The computation is independent of the level of seismic activity and can be carried out on a typical desktop computer. The procedure has been successfully demonstrated in two and three dimensions using data from the Southern California Seismic Network (Trinet). At higher resolutions, the reconstruction method can identify finite source effects. Further work considers extending the method by implementing full elastic theory and solving for moment tensors at all locations in the mesh.Background

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Crustal structure and seismicity distribution adjacent to the Pacific and North America plate boundary in southern California

Cited by 271 publications

References 44 publications

Interseismic strain accumulation and the earthquake potential on the southern San Andreas fault system

Interseismic strain accumulation and the earthquake potential on the southern San Andreas fault system

Earthquake locations in southern California obtained using source‐specific station terms

Real-time Earthquake Location Using Kirchhoff Reconstruction

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