Abstract
SUMMARY Ray tracing through models consisting of constant-velocity layers separated by curved interfaces, may be implemented by finding ray-paths whose traveltimes are stationary with respect to changes in ray/interface intersection positions. The amplitude of the resulting event is related to the second derivative of the traveltime with respect to changes in rayhnterface intersection position. For complex multilayered models the traveltime functions can be multivalued. Stationary points are then found by decomposition of the function into a number of single valued functions.
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