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Books > Earth & environment > Earth sciences > The hydrosphere > Oceanography (seas)
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Ocean Seismo-Acoustics - Low-Frequency Underwater Acoustics (Paperback, Softcover reprint of the original 1st ed. 1986)
Loot Price: R4,064
Discovery Miles 40 640
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Ocean Seismo-Acoustics - Low-Frequency Underwater Acoustics (Paperback, Softcover reprint of the original 1st ed. 1986)
Series: IV Marine Sciences, 16
Expected to ship within 10 - 15 working days
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Seafloor investigation has long been a feature of not only
seismology but also of acoustics. Indeed it was acoustics that
produced depth sounders, giving us the first capability of
producing both global and local maps of the seafloor. Subsequently,
better instrumentation and techniques led to a clearer, more
quantitative picture of the seabed itself, which stimulated new
hypotheses such as seafloor spreading through the availability of
more reliable data on sediment thickness over ocean basins and
other bottom features. Geologists and geophysicists have used both
acoustic and seismic methods to study the seabed by considering the
propagation of signals arising from both natural seismic events and
man-made impulsive sources. Although significant advances have been
made in instrumentation, such as long towed geophysical arrays, ai
r guns and ocean bot tom seismometers, the pic ture of the seafloor
is still far from complete. Underwater acoustics concerns itself
today with the phenomena of propagation and noise at frequencies
and ranges that require an understanding of acoustic interaction at
both of its boundaries, the sea surface and seafloor, over depths
ranging from tens to thousands of meters. Much of the earlier
higher frequency (>1 kHz) work included the characterization of
the seafloor in regimes of reflection coefficients which were
empirically derived from surveys. The results of these studies met
with only limited success, confined as they were to those areas
where survey data existed and lacking a physical understanding of
the processes of reflection and scattering.
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