A one-dimensional reference model combining elastic wave speeds, density and attenuation, developed by Adam M. Dziewonski and Don L. Anderson. It incorporates joint seismic and global integral constraints rather than treating density as a direct travel-time measurement.
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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.