Head Waves in ocean acoustic ambient noise: Measurements and modeling

Authors

Martin Siderius, Portland State UniversityFollow
Jie Li, University of California - San DiegoFollow
Peter Gerstoft, University of California - San DiegoFollow

Sponsor

The authors would like to gratefully acknowledge support for this research by the Office of Naval Research Ocean Acoustics Program under Grant No. N00014-13-1- 0632.

Published In

Journal of the Acoustical Society of America

Document Type

Article

Publication Date

2-2018

Subjects

Interferometry, Continuum mechanics, Signal processing, Optical signal processing, Beamforming

Abstract

Seismic interferometry recovers the Green’s function between two receivers by cross-correlating the field measured from sources that surround the receivers. In the seismic literature, it has been widely reported that this processing can produce artifacts in the Green’s function estimate called “spurious multiples” or the “virtual refracted wave.” The spurious multiples are attributed to the head wave and its multiples and travels in the seabed. The head wave phenomenon is shown to be observable from both controlled active sources and from ocean ambient noise and for both vertical and horizontal arrays. The processing used is a generalization of the passive fathometer to produce cross-beam correlations. This passive fathometer is equivalent to the seismic interferometry techniques for delay and sum beamforming but not for adaptive beamforming. Modeling and experimental data show the head wave is observed in ocean noise and can be used to estimate the seabed sound speed.

Description

Copyright 2018 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. The following article appeared in Siderius, M., Li, J., & Gerstoft, P. (2018). Head waves in ocean acoustic ambient noise: Measurements and modeling. The Journal of the Acoustical Society of America, 143(2), 1182-1193, and may be found at https://doi.org/10.1121/1.5024332

DOI

10.1121/1.5024332

Persistent Identifier

http://archives.pdx.edu/ds/psu/24233

Citation Details

Siderius, Martin, Jie Li, and Peter Gerstoft. "Head waves in ocean acoustic ambient noise: Measurements and modeling." The Journal of the Acoustical Society of America 143, no. 2 (2018): 1182-1193.