1887
Volume 43 Number 6
  • E-ISSN: 1365-2478

Abstract

Abstract

A migration algorithm appropriate for moderately varying lateral velocity changes is developed as an extension of phase‐shift migration by using a variable‐length spatial transform. This process significantly reduces the number of lateral wave‐numbers necessary to downward continue the data, and it replaces the spatial FFT with a simple recursion relationship. For a given frequency and position , ten lateral wavenumbers are typically sufficient, and the migration algorithm produces accurate images when the velocity structure () changes over a few depth intervals of thickness Δz, with lateral velocity gradients up to 1.4 to 1.0.

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2006-04-28
2024-03-29
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  • Article Type: Research Article

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