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Chapter 6: Root-Mean-Square Velocity Estimation

R. Lynn Kirlin
R. Lynn Kirlin
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January 01, 1999

6.1 Introduction

The covariance analysis approach to directions of plane-wave arrival or multiple sinusoid frequency estimation have already been detailed in Chapter 5. In Chapter 7 Fu Li and Hui Liu derive optimal subspace estimators of two-way vertical traveltime and rms velocity for single wavefronts. Because hyperbolic wavefronts by definition are not planar and wavelets are not temporally narrowband, direct applications of high-resolution subspace algorithms often do not work well. In this chapter I will give some of the details and trade-offs in the estimation of rms velocity when multiple broadband wavefronts are present in the analysis window. I will also present two enhancements of conventional semblance. The first is a low-rank or signal subspace version of semblance, and the second, the multiple sidelobe canceller, is an adaptive interference cancelling method that presents to the semblance algorithm a best estimate of interference-free wavefronts. These enhancements can substantially improve resolution and coherence estimation

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Geophysical Developments Series

Covariance Analysis for Seismic Signal Processing

Society of Exploration Geophysicists
ISBN electronic:
Publication date:
January 01, 1999




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