About SPUD

SPUD Version 3.0

The Searchable Product Depository (SPUD) is the IRIS DMC's primary data product management system. Complementing the DMC's SEED and assembled data archives, which contain time series recordings, the SPUD system primarily contains derivative data products of other types (images, movies, etc.) created either at the DMC or by members of the community.

For users SPUD is the query and access point for these products. The web interfaces allow users to search for products using customized queries across product and event details. Users can search across all product types at once or within specific product types. SPUD also has web service interfaces for programmatic discovery and access to the data products.

If any products from SPUD are used in your research please be sure to cite the identified author of the product and the IRIS DMS [Citation Information].

About Earth Model Products

The Earth models presented here are contributed to the IRIS Earth Model Collaboration (EMC) by various researchers.

Two general types of model are available for download:

  • Tomography Models:
    The contributed Earth models in their original format and in a common netCDF (network Common Data Form). A model overview page provides a summary of the model.

  • Reference Models:
    Most EMC Earth models are expressed as perturbations relative to a particular reference 1-D model. These reference models are available for download in expanded comma separated value (CSV) file format with the first two lines representing the file’s header.

For model visualization and additional information about the models visit the IRIS EMC Product Page.

Citing Earth Model Products

If you use Earth Models in publications, please cite according to the instructions at:

Megnin, Charles and Barbara Romanowicz. 2000. "The shear velocity structure of the mantle from the inversion of of body, surface and higher modes waveforms.", Geophys. J. Int. 143:709-728.

http://ds.iris.edu/ds/products/emc/#citation

When citing this Earth Model page please use the Digital Object Identifier (DOI):

doi:10.17611/DP/10131184

Earth Model Help

The page displays information for individual Earth Models.

The model information is summarized at the top including links to further information.
A global shear velocity structure of the mantle icon
Model Summary
Name:  SAW24B16
Title:  A global shear velocity structure of the mantle
Type: 3D Tomography
Sub Type:  S velocity
Year 2000
Author(s): Charles Megnin
Berkeley Seismological Laboratory
University of California, Berkeley

Barbara Romanowicz
Berkeley Seismological Laboratory
University of California, Berkeley
Reference(s): Megnin, Charles and Barbara Romanowicz. 2000. "The shear velocity structure of the mantle from the inversion of of body, surface and higher modes waveforms.", Geophys. J. Int. 143:709-728.
DOI: doi:10.17611/DP/10131184
Depth Coverage: 30.0 - 2890.0 km
Areal Coverage: Latitude: -90.0 to 90.0 Longitude: -180.0 to 180.0
Model Description The model SAW24B16 is a VSh model parameterized laterally in spherical harmonics up to degree 24 (Edmonds normalization) and radially in 16 unevenly spaced splines. Model values are percent perturbation relative to the anisotropic reference model PREM .
Data Set Description The model was derived with handpicked transverse component waveforms, including: 1. SH body waves (S, SS, S3, S4, ScS, ScS2, ScS3, Sdiff and corresponding depth phases: sS, etc...), down to a corner frequency of 32 sec 2. 1st & 2nd orbit Love waves 3. 1st & 2nd orbit higher modes down to a corner frequency of 70 sec
Web Page seismo.berkeley.edu/~barbara/saw24b16.html
EMC Page ds.iris.edu/ds/products/emc-saw24b16
Model Data
DescriptionSizeModel
The netCDF binary for the above 2°x2° model expressed as percent S-velocity perturbation relative to the PREM reference model. 2.0 MB
The netCDF binary for the above 2°x2° model expressed as S-velocity in km/s. 2.0 MB
Model in its original format 2.1 MB
Based On
TypeNameTitleReference
1D ReferencePREMPreliminary Reference Earth Model (PREM) Dziewonski and Anderson (1981)
Model URLs
URLDescription
ftp://quake.geo.berkeley.edu/outgoing/pepe/saw24b16.tar.gzSAW24B16 coefficients and the code to read them
[Megnin and Romanowicz (2000)] Figure shows lateral sections of SAW24B16 in the upper mantle.
Model Areal Coverage
Contributions