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:

Simmons, N.A., S.C. Myers, G. Johannesson, and E. Matzel. 2012. "LLNL-G3Dv3: Global P wave tomography model for improved regional and teleseismic travel time prediction." J. Geophys. Res. 117:B10302, doi:10.1029/2012JB009525.

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/10131310

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 P wave tomography model based on regional and teleseismic travel times icon
Model Summary
Name:  LLNL-G3Dv3
Title:  A global P wave tomography model based on regional and teleseismic travel times
Type: 3D Tomography
Sub Type:  P velocity
Year 2012
Author(s): Nathan A. Simmons
Atmospheric, Earth and Energy Division
Lawrence Livermore National Laboratory
Livermore, California, USA

Stephen C. Myers
Atmospheric, Earth and Energy Division
Lawrence Livermore National Laboratory
Livermore, California USA

Gardar Johannesson
Systems and Decision Sciences
Lawrence Livermore National Laboratory
Livermore, California USA

Eric Matzel
Atmospheric, Earth and Energy Division
Lawrence Livermore National Laboratory
Livermore, California USA
Reference(s): Simmons, N.A., S.C. Myers, G. Johannesson, and E. Matzel. 2012. "LLNL-G3Dv3: Global P wave tomography model for improved regional and teleseismic travel time prediction." J. Geophys. Res. 117:B10302, doi:10.1029/2012JB009525.
DOI: doi:10.17611/DP/10131310
Depth Coverage: 0.0 - 2891.0 km
Areal Coverage: Latitude: -90.0 to 90.0 Longitude: -180.0 to 180.0
Model Description The LLNL-G3Dv3 is a global-scale model of the crust and mantle P-wave velocity with regional-scale details. The model is parameterized using a spherical tessellation with node spacing of ~1 degree in the upper mantle and ~2 degrees in the lower mantle.
Data Set Description The model was developed using over 2.8 million groomed and reprocessed P and Pn travel times with events located with the Bayesloc global multiple event location technique (Myers et al. 2007, 2009, 2011 ). Original data sources include the EHB bulletin (Engdahl et al., 1998 ) provided by the International Seismological Centre (ISC), the National Earthquake Information Center (NEIC) bulletin, and a variety of regional bulletins. Additional data are derived from seismic deployments for Peaceful Nuclear Explosions (PNE's), large refraction surveys, the USARRAY Transportable Array (TA) and temporary PASSCAL deployments around the world (IRIS).
EMC Page ds.iris.edu/ds/products/emc-llnl-g3dv3/
Model Data
DescriptionSizeModel
Complete model package contains LLNL_G3Dv3_README.pdf file detailing the contents. Velocity values are expressed as absolute velocity and percentage variations relative to the layer average. 33.9 MB
Figure below shows LLNL-G3Dv3 P-wave velocity in selected upper mantle layers (lower mantle not shown). See Simmons, Myers, Johannesson & Matzel (2012) for more details.
Model Areal Coverage
Contributions