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For the anisotropic elastic case the differential operator is
a 6x3 matrix of partial spatial derivatives and when operating on
the displacement field results in the symmetric Lagrange strain tensor.
| |
(2) |

Giving us the following set of first order (in space) equations:
| |
(3) |

| (4) |

| (5) |

where *a* is the density and *b* represents the stiffness matrix.
In general the stiffness matrix is a sparse matrix, and can be simplified
for different degrees of symmetry.

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** Up:** WAVE EQUATIONS
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Stanford Exploration Project

11/17/1997