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The AAPG/Datapages Combined Publications Database

Houston Geological Society Bulletin


Houston Geological Society Bulletin, Volume 54, No. 07, March, 2012. Page 39 - 39.

ABSTRACT: Selected Topics in Seismic Dispersion

Christopher L. Liner
Professor and Department Associate Chairman, Earth & Atmospheric Sciences, University of Houston

This presentation is a survey of selected frequency-dependent phenomena routinely encountered in Previous HitreflectionNext Hit seismic data. At first impression the topic seems self-evident; everything is frequency dependent. However, much of classical seismology and wave theory is non-dispersive — the theory of P and S waves, Rayleigh waves in a half-space, geometric spreading, Previous HitreflectionNext Hit and Previous HittransmissionNext Hit Previous HitcoefficientsNext Hit, head waves, etc. The convolutional Previous HitreflectionNext Hit models we use to model thick and thin bed thin response, as well as most inversion techniques, do not include dispersion phenomena. And yet when we look at real data, strong dispersion abounds.

The classical meaning of the word dispersion is frequency-dependent velocity. We take a more general definition that includes not just wave speed, but also interference, attenuation, anisotropy, Previous HitreflectionTop characteristics and other aspects of seismic waves that show frequency-dependence. We will examine the interpretive challenges presented by the reality of dispersion using modern, real data examples.

This presentation is a summary of Dr. Liner’s 2012 SEG Distinguished Instructor Short Course, scheduled in Houston on April 20, 2012.

Figure 1. Interference beyond the thin bed.

Figure 2. 6 Hz timeslice


Copyright © 2012 by Houston Geological Society. All rights reserved.