f 3D Multivalued Travel Time and Amplitude Maps

We present an algorithm for determination of rnultivalued travel times and amplitudes in a cube. Our approach is based on the wavefront construction rnethod proposed in [2]. In order to ensure regular sampling of a multiply folded ray field with caustics we apply a ray density criterion that involves slowness vector components in addition to spatial coordinates. This criterion is described in detail in [1], where the 2-D version of the same algorithm is presented.