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:

Lekic, V. and B. Romanowicz, 2011, Inferring upper-mantle structure by full waveform tomography with the spectral element method. Geophys. J. Int. 185(2), 799-831

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/10131263

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 high-resolution global shear velocity model of upper mantle icon
Model Summary
Name:  SEMum
Title:  A high-resolution global shear velocity model of upper mantle
Type: 3D full-waveform Earth Model
Sub Type:  A radially anisotropic shear velocity model
Year 2011
Author(s): Ved Lekic
Department of Geology
University of Maryland, College Park, Maryland

Barbara Romanowicz
Berkeley Seismological Laboratory
University of California, Berkeley
Reference(s): Lekic, V. and B. Romanowicz, 2011, Inferring upper-mantle structure by full waveform tomography with the spectral element method. Geophys. J. Int. 185(2), 799-831
DOI: doi:10.17611/DP/10131263
Depth Coverage: 80.0 - 2850.0 km
Areal Coverage: Latitude: -90.0 to 90.0 Longitude: -180.0 to 180.0
Model Description 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) based on a 1-D reference model.
Data Set Description Dataset includes minor- and major-arc fundamental mode and overtone wavepackets from 200 earthquakes recorded at more than 100 broadband stations around the globe. In order to minimize the contamination from source complexity, all earthquakes have moment magnitude < 7.0 (moment tensors and centroid locations are from the Harvard Centroid Moment Tensor Project).
EMC Page ds.iris.edu/ds/products/emc-semum/
Model Data
DescriptionSizeModel
the netCDF binary for the above model expressed as velocity perturbation. 4.5 MB
the netCDF binary for the above model expressed as absolute velocity 4.5 MB
Model URLs
URLDescription
http://seismo.berkeley.edu/~lekic/SEMum_dist.tar.gzoriginal model files from the model download page
Figure, Lekic and Romanowicz (2011), maps of the Voigt average shear wave speed variations in Africa and surrounding oceans with respect to the average velocity at each depth.
Model Areal Coverage
Contributions