Abstract

This paper presents the filter correlation method, a technique for extracting consistent and accurate estimates of attenuation parameters from acoustic waveform data. The method minimizes problems associated with short time windows and multipath secondary arrivals. The method comprises two stages: a causal passband filter stage followed by a cross-correlation step. The results of the filter-correlation estimator are compared to those of the spectral difference approach for short time series with and without a secondary multipath arrival. Preliminary analyses of acoustic data collected on cored marine silts and clays show the attenuation properties of these materials cannot be described by a constant Q mechanism. The filter correlation method refines estimates of frequency-dependent velocity, revealing a small but systematic anisotropy between measurements made parallel and transverse to the sediments' bedding plane. The observed velocity anisotropy can be modeled by assuming layered porosity variations in the cored sediments. No systematic anisotropy in attenuation was observed.

Publication Date

2-1993

Journal Title

Journal of the Acoustical Society of America

Publisher

Acoustical Society of America

Digital Object Identifier (DOI)

10.1121/1.405509

Document Type

Article

Rights

© 1993 Acoustical Society of America.This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America.

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