Measuring Lateral Variability of Sediment Geoacoustic Properties

Publication Status is "Submitted" Or "In Press: 
LDEO Publication: 
Publication Type: 
Year of Publication: 
1994
Editor: 
Journal Title: 
Journal of the Acoustical Society of America
Journal Date: 
Jul
Place Published: 
Tertiary Title: 
Volume: 
96
Issue: 
1
Pages: 
427-438
Section / Start page: 
Publisher: 
ISBN Number: 
0001-4966
ISSN Number: 
Edition: 
Short Title: 
Accession Number: 
ISI:A1994NW52100047
LDEO Publication Number: 
Call Number: 
Key Words: 
Abstract: 

Dispersion analysis of interface waves (Scholte/Stoneley/Rayleigh) has been used extensively to determine geoacoustic models of near-bottom ocean sediments. In the traditional approach, a single seismic trace is analyzed to obtain group velocity dispersion using the multiple filter technique. A dispersion curve obtained in this manner reflects the averaged influence of the sediment acoustic properties over the entire path from source to receiver. Thus a geoacoustic model derived from this dispersion curve is not a true vertical section in the vicinity of the receiver unless the sediment properties do not change over the entire propagation path. However, when a linear array of receivers is used to obtain data simultaneously at a number of different ranges, it is possible to derive both group and phase velocity dispersion curves that correspond to propagation over a short portion (typically 5 m) of the total path at many different ranges. With this kind of data, the range-dependent variation of geoacoustic properties in the sediment may be assessed. Results are presented based on data obtained with a 24-receiver array and an explosive source, both deployed on the seafloor. Analysis of data from a number of shallow water sites suggests that there is a considerable amount of lateral inhomogeneity even over very short ranges.

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Nw521Times Cited:16Cited References Count:10

DOI: