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Data Services Products: Metadata: Tags: reference-earth-model

Number of products tagged with reference-earth-model (8).

EMC-ak135-f A velocity reference Earth model

ak135-f is a variant of the ak135 velocity model, Kennett, Engdahl & Buland (1995) , which is obtained by augmenting it with the density and Q model of Montagner & Kennett (1996) .

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EMC-iasp91 P & S velocity reference Earth model

The iasp91 reference model is a parameterised velocity model that has been constructed to be a summary of the travel time characteristics of the main seismic phases, Kennett (1991).

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EMC-MC35 A 1-D modified PEM-C S velocity model

MC35 reference Earth model is based on the continental Earth model PEM-C . MC35 replaces PEM-C ‘s high- and low-velocity zones of the uppermost mantle (to the depth of 210 km) with a constant shear-wave velocity of 4.5 km/s.

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EMC-PEM Parametric Earth Models

Parametric Earth Models (PEM) — Three models (Average, Continental & Oceanic) that were introduced by Dziewonski, Hales and Lapwood (1975) 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.

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EMC-PREM Preliminary Reference Earth Model

(referenced by GyPSum , SAW24B16 and as PREM500 by SAW642AN and SAW642ANb ) The Preliminary Reference Earth Model, Dziewonski and Anderson (1981) , is an average Earth model that incorporates anelastic dispersion and anisotropy and therefore it is frequency-dependent and transversely isotropic for the upper mantle.

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EMC-ReferenceModels IRIS EMC - Reference Earth Models

Most of the EMC Earth models are expressed as perturbations relative to a particular 1-D reference Earth model. This page provides access to some reference Earth models that are hosted by EMC or hosted externally.

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EMC-STW105 Reference Earth Model also known as REF

STW105 (also known as REF) is a transversely isotropic reference Earth model, Kustowski, Ekstrom and Dziewonski (2008).

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EMC-TNA_SNA An average of the TNA and SNA models

An average of the TNA (Tectonic North America) and SNA (Shield North America) S velocity models of Grand and Helmberger (1984)

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