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:

Dziewonski, A. M., A. L. Hales, and E. R. Lapwood. 1975. "Parametrically simple earth models consistent with geophysical data Phys." Earth Plan. Int. 10:12.

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/9991828

Earth Model Help

The page displays information for individual Earth Models.

The model information is summarized at the top including links to further information.
Parametric Earth Models (PEM) (Inactive) icon
Model Summary
Name:  PEM
Title:  Parametric Earth Models (PEM)
Type: 1D Reference
Sub Type:  full model
Author(s): A. M. Dziewonski, A. L. Hales & E. R. Lapwood
Reference(s): Dziewonski, A. M., A. L. Hales, and E. R. Lapwood. 1975. "Parametrically simple earth models consistent with geophysical data Phys." Earth Plan. Int. 10:12.
DOI: doi:10.17611/DP/9991828
Depth Coverage: 0.0 - 6371.0 km
Model Description Parametric Earth models (PEM) introduced by Dziewonski, Hales and Lapwood (1975) consists of three models (Average, Continental & Oceanic) for which the radial variations of density and velocity are represented by piecewise continuous analytical functions of radius. All three models are identical below a depth of 420 km.
EMC Page ds.iris.edu/ds/products/emc-pem
Model Data
DescriptionSizeModel
Average Parametric Earth Model (PEM-A) in comma separated value (CSV) file format [columns lef to right representing Radius (km), Depth (km), Density (g/cm3), Vp (km/s) and Vs (km/s)] 5.9 KB
Average Parametric Earth Model (PEM-A) in comma separated value (CSV) IDV file format 6.0 KB
Continental Parametric Earth Model (PEM-C) that reflects different properties of the continental upper mantle in comma separated value (CSV) file format [columns lef to right representing Radius (km), Depth (km), Density (g/cm3), Vp (km/s) and Vs (km/s)] 5.9 KB
Continental Parametric Earth Model (PEM-C) that reflects different properties of the continental upper mantle in comma separated value (CSV) IDV file format 6.0 KB
Oceanic Parametric Earth Model (PEM-O) that reflects different properties of the oceanic upper mantle in comma separated value (CSV) file format [columns lef to right representing Radius (km), Depth (km), Density (g/cm3), Vp (km/s) and Vs (km/s)] 5.9 KB
Oceanic Parametric Earth Model (PEM-O) that reflects different properties of the oceanic upper mantle in comma separated value (CSV) IDV file format 6.0 KB
Referenced By
TypeNameTitleReference
1D ReferenceMC35A 1D modified PEM-C S velocity model van der Lee and Nolet (1997)
1D ReferenceSTW105A 1D Reference Earth Model Kustowski, Ekstrom and Dziewonski (2008)
PEM-C Reference Earth Model
Contributions