Summary
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.
Quicklinks
Description
| Name | PEM (PEM-A, PEM-C & PEM-O) |
| Title | Parametric Earth Models (PEM) |
| Type | 1-D Reference Earth Model |
| Sub Type | full model |
| Year | 1975 |
| Short Description | Parametric Earth models (PEM) introduced by Dziewonski, Hales and Lapwood (1975) consists of three models 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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| Authors: | |
| A. M. Dziewonski | |
| Department of Earth and Planetary Sciences | |
| Harvard University | |
| Cambridge, Massachusetts, USA | |
| A. L. Hales | |
| Research School of Earth Sciences | |
| Australian National University | |
| Canberra, A.C.T., Australia | |
| E. R. Lapwood | |
| Department of Applied Mathematics and Theoretical Physics | |
| University of Cambridge | |
| Cambridge,, England | |
| Base Model | |
| Referenced by | MC35 (references PEM-C) |
| Model Download | |
| PEM-A in comma separated value (CSV) file format (PEMA.csv ) with columns lef to right representing Radius (km), Depth (km), Density (g/cm3), Vp (km/s) and Vs (km/s) | |
| PEM-A in IDV CSV file format (PEMA_IDV.csv ). | |
| PEM-C in comma separated value (CSV) file format (PEMC.csv ) with columns lef to right representing Radius (km), Depth (km), Density (g/cm3), Vp (km/s) and Vs (km/s) | |
| PEM-C in IDV CSV file format (PEMC_IDV.csv ). | |
| PEM-O in comma separated value (CSV) file format (PEMO.csv ) with columns lef to right representing Radius (km), Depth (km), Density (g/cm3), Vp (km/s) and Vs (km/s) | |
| PEM-O in IDV CSV file format (PEMO_IDV.csv). | |
| Model Homepage | |
| Depth Coverage | 0 to 6371.0 km |
| Area | Point data |
Citations and DOIs
To cite the original work behind this Earth model:
- 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. https://doi.org/10.1016/0031-9201(75)90017-5.
To cite IRIS DMC Data Products effort:
- Trabant, C., A. R. Hutko, M. Bahavar, R. Karstens, T. Ahern, and R. Aster (2012), Data Products at the IRIS DMC: Stepping Stones for Research and Other Applications, Seismological Research Letters, 83(5), 846–854, https://doi.org/10.1785/0220120032.
DOI for this EMC webpage:
Credits
- A.M. Dziewonski, A.L. Hales, and E.R. Lapwood
Timeline
- 2010-12-09
- Online
