Eurasian surface wave tomography: Group velocities

Ritzwoller, M. H.; Levshin, A. L.

doi:10.1029/97jb02622

Cited by 424 publications

(361 citation statements)

References 90 publications

(22 reference statements)

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“…Uncertainties due to the density of wave paths and azimuthal coverage can be taken into account a posteriori by applying a smoothing filter to the tomographic maps, as was done in this study. Ritzwoller & Levshin (1998) proved that random mislocations have a minimal effect on the group velocity maps. Although the effect of mislocations is stronger for closer events, it can be reduced when there are many paths crossing the region, which do not originate in the same source region (Ritzwoller & Levshin 1998), as in our case.…”

Section: Methodsmentioning

confidence: 99%

“…Ritzwoller & Levshin (1998) proved that random mislocations have a minimal effect on the group velocity maps. Although the effect of mislocations is stronger for closer events, it can be reduced when there are many paths crossing the region, which do not originate in the same source region (Ritzwoller & Levshin 1998), as in our case. Besides, when the number of crossing paths is large the smearing of the tomographic inversion is greatly reduced with respect to areas of poor ray path coverage (Pasyanos & Walter 2002).…”

Section: Methodsmentioning

confidence: 99%

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Seismic structure beneath the Gulf of California: a contribution from group velocity measurements

Luccio

Persaud

Clayton

2014

Geophysical Journal International

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Seismic structure beneath the Gulf of California: a contribution from group velocity measurements

Luccio

Persaud

Clayton

2014

Geophysical Journal International

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“…Space prohibits an exhaustive discussion of the all of the steps that lead to the model. For further information about the data processing, the reader should see Ritzwoller and Levshin [1998] (hereinafter referred to as RL1998), BRL2001 provide a more complete discussion of the method of surface wave tomography and resolution analysis, and SR2001 give a fuller description of the method of inversion for a shear velocity model of the crust and uppermost mantle. This paper is an application of methods largely described elsewhere, and we will attempt to point to some of the more intriguing features of the crust and upper mantle that have emerged in this study.…”

Section: Introductionmentioning

confidence: 99%

Crustal and upper mantle structure beneath Antarctica and surrounding oceans

Ritzwoller¹,

Shapiro²,

Levshin³

et al. 2001

J. Geophys. Res.

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Abstract. We present and discuss a new model of the crust and upper mantle at high southern latitudes that is produced from a large, new data set of fundamental mode surface wave dispersion measurements. The inversion for a 2 ø x 2 ø shear velocity model breaks into two principal steps: first, surface wave tomography in which dispersion maps are produced for a discrete set of periods for each wave type (

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“…Ritzwoller and Levshin [1998] previously performed a top-quality surface wave tomography of a similar area region in Eurasia. They used about 600 events recorded at 83 stations to produce about 9000 paths, resulting in a 5º resolution model.…”

Section: Introductionmentioning

confidence: 99%

A variable resolution surface wave dispersion study of Eurasia, North Africa, and surrounding regions

Pasyanos

2005

J. Geophys. Res.

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This paper presents the results of a large-scale study of surface wave dispersion performed across Eurasia and North Africa. Improvements were made to previous surface wave work by enlarging the study region, increasing path density, improving spatial resolution, and expanding the period range. This study expands the coverage area northwards and eastwards relative to a previous dispersion analysis, which covered only North Africa and the Middle East. We have significantly increased the number of seismograms examined and group velocity measurements made. We have now made good quality dispersion measurements for about 30,000 Rayleigh wave and 20,000 Love wave paths, and have incorporated measurements from several other researchers into the study. A conjugate gradient method was employed for the group velocity tomography, which improved the inversion from the previous study by adopting a variable smoothness. This technique allows us to go to higher resolution where the data allow without producing artifacts. The current results include both Love and Rayleigh wave inversions across the region for periods from 7 to 100 seconds at 1º resolution. Short period group velocities are sensitive to slow velocities associated with large sedimentary features such as the Caspian Sea, West Siberian Platform, Mediterranean Sea, Bay of Bengal, Tarim Basin, and Persian Gulf.Intermediate periods are sensitive to differences in crustal thickness, such as those between oceanic and continental crust or along orogenic zones and continental plateaus. At longer periods, fast velocities are consistently found beneath cratons while slow upper mantle velocities occur along rift systems, subduction zones, and collision zones such as the Tethys Belt. We have compared the group velocities at various periods with features such as sediment thickness, topographic height, crustal thickness, proximity to plate boundaries, lithospheric age and lithospheric thickness, and find significant correlations. We don't find any similar correlation between the longest period surface waves and hot spots.3

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Eurasian surface wave tomography: Group velocities

Cited by 424 publications

References 90 publications

Seismic structure beneath the Gulf of California: a contribution from group velocity measurements

Seismic structure beneath the Gulf of California: a contribution from group velocity measurements

Crustal and upper mantle structure beneath Antarctica and surrounding oceans

A variable resolution surface wave dispersion study of Eurasia, North Africa, and surrounding regions

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