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The general modeling implementation is based on a wave equation of the form

| |
(1) |

*u* is an arbitrary wave field (scalar or vector); *f* is the force applied
at a source location. is a gradient and the divergence operator applied to the wavefield components.
*a* and *b* are medium property fields (density, velocity or stiffnesses).
Equation (1) can be rewritten as a sequence of first order
partial differential equations. Numerical calculations typically use those
on a staggered grid for improved accuracy.

** Next:** Elastic medium
** Up:** Karrenbach: Wave equation modules
** Previous:** Introduction
Stanford Exploration Project

11/17/1997