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2-D finite difference modeling can be used to generate shot data from input depth models. Both acoustic and elastic high-order finite difference algorithms are available. Input would be a depth model with P-wave, S-wave and density describing the model of interest. A simple low velocity dome is shown where there is no S-wave contract at the base of the dome but a P-wave velocity contrast from 2500m/second to 2600m/second. The deeper P-S event does not contain a horizontal reflection due to the lack of shear impedance contrast.
The algorithms run with or without the inclusion of free-surface multiples. |
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