Abstract
In this paper we examine the dependence of the reflection points on
the velocity model for multi-component OBC datasets. The effects
considered are important both for coverage analysis during survey
planning and for correct imaging of acquired data. Whilst this is
most obvious for the converted waves, it may also be important for
P-wave energy when the water depth is significant, in which case
the CMP assumption becomes suspect even for flat layers. An important
parameter is the Vs/Vp ratio which ratio is conventionally called
gamma (gamma). The effects on the common conversion point (CCP) of
anisotropy, target depth, and sea bed depth, can be approximated
as an adjustment of g. We call the more general parameter gammaCCP.
We propose a new method for the estimation of gammaCCP. Our method
is based upon converted wave stacking trajectories. The method, which
is applied to prestack data, maximizes a coherency function (usually
semblance) varying the effective gammaCCP parameter.
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