The parabolic approximation does not accurately model residual moveout for long-offset marine data. Consequently the focusing power of the parabolic Radon transform is degraded. Maeland (1998) analyzes this problem by deriving the envelope of hyperbolic events in the (τ, q) domain. This note extends Maeland's analysis to the hyperbolic Radon transform (τ, p) domain.

Following the notation of Maeland (1998) for the parabolic transform, I modify his equation (5) to model the fixed-focus hyperbolic Radon transform domain as defined by Foster and Mosher (1992):  
A hyperbolic event in the (t,x) domain...
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