= Preliminary reference Earth model
{wiki=Preliminary_reference_Earth_model}
The Preliminary Reference Earth Model (PREM) is a spherically symmetric model of the Earth's internal structure and composition. Developed by Dziewonski and Anderson in 1981, PREM provides a standard reference for understanding the Earth's physical properties, including density, elastic moduli, and seismic wave velocities as a function of depth. Key features of PREM include: 1. **Radial Variation**: PREM describes how various physical properties change with depth from the Earth's surface to its center.
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