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The second example is the case of a point diffractor (the left side
of Figure 4). Without loss of generality, the origin
of the midpoint axis can be put above the diffraction point. In this
case the zero-offset reflection traveltime curve has the well-known
hyperbolic form
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ococrv
Figure 4. Transformation of the reflection traveltime curves in the OC process. Left: the case of a diffraction point. Right: the case of an elliptic reflector. Solid lines indicate traveltime curves at different common-offset sections, dashed lines indicate time rays. |
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