Head wave signals from small explosive charges have been analyzed
to determine a geoacoustic profile for a shallow water site off the
West coast of Vancouver Island. The experimental design contained
a vertical aperture, provided by a vertical line array, and a synthetic
horizontal aperture from shots at different ranges from the vertical
line array. The simultaneous use of travel time and amplitude data
for both apertures provided improved accuracy and vertical resolution
of the estimated geoacoustic profile. Travel time vs range data from
head waves from three distinct sub-bottom interfaces were used to
measure compressional speeds in the layers below the interfaces and
estimate the layers' thicknesses. Spatial filtering of the vertical
line array data was necessary to resolve the head wave arrival from
the shallowest layers. Analysis of the interference structure of
the head wave power spectra at the vertical line array provided the
means to measure the travel time of the head wave from the deepest
layer. In addition, the head wave power spectra were used to estimate
the compressional wave attenuation, using a method based on the variation
with range of the logarithmic derivative with respect to frequency
of the head wave spectrum.
%0 Journal Article
%1 godin_etal:1999
%A Godin, Oleg A.
%A Chapman, Ross N.
%A Laidlaw, Mark C. A.
%A Hannay, David E.
%D 1999
%I ASA
%J Journal of the Acoustical Society of America
%K geophysics seismics
%N 5
%P 2540--2551
%R 10.1121/1.428130
%T Head wave data inversion for geoacoustic parameters of the ocean
bottom off Vancouver Island
%U http://dx.doi.org/10.1121/1.428130
%V 106
%X Head wave signals from small explosive charges have been analyzed
to determine a geoacoustic profile for a shallow water site off the
West coast of Vancouver Island. The experimental design contained
a vertical aperture, provided by a vertical line array, and a synthetic
horizontal aperture from shots at different ranges from the vertical
line array. The simultaneous use of travel time and amplitude data
for both apertures provided improved accuracy and vertical resolution
of the estimated geoacoustic profile. Travel time vs range data from
head waves from three distinct sub-bottom interfaces were used to
measure compressional speeds in the layers below the interfaces and
estimate the layers' thicknesses. Spatial filtering of the vertical
line array data was necessary to resolve the head wave arrival from
the shallowest layers. Analysis of the interference structure of
the head wave power spectra at the vertical line array provided the
means to measure the travel time of the head wave from the deepest
layer. In addition, the head wave power spectra were used to estimate
the compressional wave attenuation, using a method based on the variation
with range of the logarithmic derivative with respect to frequency
of the head wave spectrum.
@article{godin_etal:1999,
abstract = {Head wave signals from small explosive charges have been analyzed
to determine a geoacoustic profile for a shallow water site off the
West coast of Vancouver Island. The experimental design contained
a vertical aperture, provided by a vertical line array, and a synthetic
horizontal aperture from shots at different ranges from the vertical
line array. The simultaneous use of travel time and amplitude data
for both apertures provided improved accuracy and vertical resolution
of the estimated geoacoustic profile. Travel time vs range data from
head waves from three distinct sub-bottom interfaces were used to
measure compressional speeds in the layers below the interfaces and
estimate the layers' thicknesses. Spatial filtering of the vertical
line array data was necessary to resolve the head wave arrival from
the shallowest layers. Analysis of the interference structure of
the head wave power spectra at the vertical line array provided the
means to measure the travel time of the head wave from the deepest
layer. In addition, the head wave power spectra were used to estimate
the compressional wave attenuation, using a method based on the variation
with range of the logarithmic derivative with respect to frequency
of the head wave spectrum.},
added-at = {2012-09-01T13:08:21.000+0200},
author = {Godin, Oleg A. and Chapman, Ross N. and Laidlaw, Mark C. A. and Hannay, David E.},
biburl = {https://www.bibsonomy.org/bibtex/28628326ed9a0f4732e30fc914f42450d/nilsma},
doi = {10.1121/1.428130},
interhash = {ed4092607e92f86d8859cfbab2ca3b91},
intrahash = {8628326ed9a0f4732e30fc914f42450d},
journal = {Journal of the Acoustical Society of America},
keywords = {geophysics seismics},
number = 5,
pages = {2540--2551},
publisher = {ASA},
timestamp = {2021-02-09T13:23:03.000+0100},
title = {Head wave data inversion for geoacoustic parameters of the ocean
bottom off Vancouver Island},
url = {http://dx.doi.org/10.1121/1.428130},
volume = 106,
year = 1999
}