DMS Products: Metadata: Tags: shear-wave

Number of products tagged with shear-wave (17).

EMC IRIS Earth Model Collaboration

A repository of Earth models with the aim of providing the research community with access to various Earth models, visualization tools for model preview, facilities to extract model data/metadata and access to the contributed processing software and scripts.

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SWS-DB the Géosciences Montpellier SplitLab Shear-Wave Splitting Database

The SplitLab Shear-Wave Splitting Database is a mirror of the Géosciences Montpellier's SplitLab Shear-wave splitting database that provides access to this valuable database using the SPUD system and its customized Google Maps interface.

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SWS-DB-MST The Missouri S&T western and central United States shear-wave splitting database

The shear-wave splitting measurements for western and central United States is a teleseismic shear-wave splitting (SWS) database based on all the data from all the broadband seismic stations in North America that contains over 16,000 pairs of well-defined (and manually checked) SWS measurements for the western and central United States (west of 90°W).

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SWS-DBs Shear-wave splitting databases

The shear-wave splitting (SWS) databases data product provides the geosciences community with an easy access to two published databases:

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EMC-NA07 North American upper mantle surface wave tomography model

NA07, Bedle and van der Lee (2009) , is based on the 3-D shear velocity model NA04 and the analysis of regional S and Rayleigh waveforms for earthquakes around North America from January 2000 through September 2006, including waveforms from the USArray Transportable Array stations. The NA07 3-D model is expressed as velocity difference in m/s relative to the 1-D averaged Earth model MC35.

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EMC-NWUS11-S A 3-D S-wave tomography model for the northwestern United States

A 3-D S-wave tomography model for the northwestern United States, James et al. (2011) . The S-wave inversion is based on a total of 88,689 rays from 379 teleseismic events, with typical bandpass filter ranges of 0.04-0.15 Hz. The percent velocity perturbations reported by this model are insensitive to the starting 1-D reference model.

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EMC-PNW10-S S-velocity model of the Cascadia Subduction Zone

PNW10-S, Porritt et al. (2011) , PNW10-S combines the state of the art ambient noise tomography method with time tested analyst selection to ensure the highest quality data is used as input to the model inversion. Incorporating spatially and temporally long paths with this manual selection step allows recoverable structure from the surface to ~120km depth. This model focuses on the US Pacific Northwest to address a series of questions relating to variations in arc volcanism, seismicity, tremor activity, and the relation to subduction complex structure.

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EMC-QRLW8 A global upper mantle shear wave attenuation model

A degree 8 3-D Q model of the upper mantle by Gung and Romanowicz (2004) , derived from three component surface waveform data in the period range of 60-400 seconds. Model is parameterized in spherical harmonics for lateral variations and cubic b-splines for depth dependence up to maximum spherical harmonics degree 16 horizontally for the SV-velocity model and 8 for the Q model with the use of 16 B-splines vertically (throughout the mantle). The velocity model is expressed as perturbations from the spherically symmetric model PREM .

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EMC-S362ANI A global model of shear-wave velocity

S362ANI, Kustowski, Ekstrom and Dziewonski (2008) , has its radial anisotropy confined to the uppermost mantle (that is, since the anisotropy is parameterized with only the four uppermost splines, it becomes very small below a depth of 250 km, and vanishes at 410 km). The 1-D reference model is “STW105”../../referencemodels/emc-stw05 .

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EMC-S362WMANI Anisotropic (anisotropy allowed throughout the mantle) S velocities

S362WMANI, Kustowski, Ekstrom and Dziewonski (2008) , is a version of S362ANI with anisotropy allowed throughout the mantle. The 1-D reference model is STW105 .

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EMC-SAW24B16 A global shear velocity structure of the mantle from body, surface and higher-mode waveforms

A 3-D shear velocity structure of mantle based on the inversion of body, surface, and higher mode waveforms, Megnin and Romanowicz (2000) . The model was derived from handpicked transverse component waveforms and is parameterized laterally in spherical harmonics up to degree 24 (Edmonds normalization) and radially in 16 unevenly spaced splines. The SAW24B16 model is expressed as the percent perturbation from PREM .

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EMC-SAW642AN A global radially anisotropic mantle shear velocity model

SAW642AN, Panning and Romanowicz (2006) , is a radially anisotropic shear velocity model, parameterized in terms of isotropic S velocity (Voigt average) and the anisotropic parameter, xi (VSH2/VSV2). Model values are percent perturbation relative to the anisotropic reference model PREM500 .

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EMC-SAW642ANb A global radially anisotropic mantle shear velocity model with improved crustal corrections

SAW642ANb, Panning, Lekic and Romanowicz (2010) , is a radially anisotropic shear velocity model of the mantel, parameterized in terms of isotropic S velocity (Voigt average) and the anisotropic parameter, xi (VSH2/VSV2). The waveform data used for this model consist of 3-component broad-band surface waveforms (short period corner of 80 seconds and cutoff of 60 seconds) as well as body waveforms (short period corner of 40 s and cutoff of 32 s). The spatial parameterization of the model is the same as SAW642AN , with 16 variably spaced cubic b-splines with depth, and level 4 spherical splines laterally. Model values are percent perturbation relative to the anisotropic reference model PREM500 .

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EMC-SAWum_NA2 A high-resolution North American model of upper mantle structure

SAWum_NA2 North American regional shear velocity model is an isotropic and radially and azimuthally anisotropic Vs model for the North American upper mantle. The isotropic and radial anisotropic portion of the model is developed using long period 3-component fundamental and overtone surface waveforms in the frame work of the Non-linear normal Mode Asymptotic Coupling Theory (Li and Romanowicz, 1995;1996). A joint inversion of surface waveforms and SKS station average datasets is used in the azimuthal anisotropy inversion (Montagner et al. 2000; Romanowicz and yuan 2012).

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EMC-SEMum A high-resolution global model of upper mantle structure

SEMum is a radially anisotropic shear velocity model, parametrized in terms of isotropic S velocity (Voigt average) and the anisotropic parameter, xi (V sh 2 /V sv 2 ). The Vs (xi) model is parametrized in terms of 2562 (642) spherical splines laterally, and 16 irregularly spaced cubic b-splines radially.

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EMC-TX2000 A global mantle shear-wave tomography model

TX2000 (also called Grand2000) refers here to the TXBW, Grand (2002) , model to distinguish it from the TXBW Grand, van der Hilst and Widiyantoro (1997) model. The model is derived from the shear body wave travel times and aims at providing a more uniform global coverage of the mantle and more information on the upper-mantle seismic structure by using analysis of multibounce shear waves, core-reflected waves and SKS and SKKS waves that travel through the core.

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EMC-TX2011 A global shear-wave tomography model

TX2011 provides shear velocity perturbations with respect to the TX2011_ref reference model with the mean from the individual layers removed. The grid is not representative of the block size used in the inversion. The model assumes the crustal thickness is given by the Mooney, Laske and Masters crustal model, Mooney et al. (1998) , and thus velocity deviations in the upper most layer are with respect to a variable crustal thickness model.

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