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Estimation of seabed shear-wave velocity profiles using shear-wave source data
The Journal of the Acoustical Society of America, 2013This paper estimates seabed shear-wave velocity profiles and their uncertainties using interface-wave dispersion curves extracted from data generated by a shear-wave source. The shear-wave source generated a seismic signature over a frequency range between 2 and 60 Hz and was polarized in both in-line and cross-line orientations. Low-frequency Scholte-
Hefeng, Dong +2 more
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On linear wave motions in magnetic-velocity shears
Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 1977Abstract The propagation properties of linear wave motions in magnetic and/or velocity shears which vary in one coordinate z (say) are usually governed by a second order linear ordinary differential equation in the independent variable z. It is proved that associated with any such differential equation there always exists a quantity A
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A further comparison of shear-wave velocities
Canadian Geotechnical Journal, 1982In a previous paper by the same authors the values of the shear-wave velocity in natural soils found from laboratory tests were compared with wave velocities measured in situ. Dynamic free-vibration torsion tests were carried out in the laboratory on undisturbed 150 × 75 mm soil samples. Downhole seismic tests were performed at the site to measure the
T. J. Larkin, P. W. Taylor
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Shear wave velocity in surface sediments
Jökull, 2011Surface sediments of different nature are common in Iceland. Natural soil sites and man-made fillings commonly serve as foundations for different types of structures. In Civil engineering work it is fundamental to know the geotechnical properties of these materials in the upper 20–30 m.
Bjarni Bessason, Sigurður Erlingsson
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Shear wave velocities in the Earth's mantle
Physics of the Earth and Planetary Interiors, 1972Direct measurement of the travel time gradient for S waves together with travel time data are used to derive a shear velocity model for the earth's mantle. In order to satisfy the data it is necessary to discard the usual assumption of lateral homogeneity below shallow depths.
Russell Robinson, Robert L. Kovach
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Shear Wave Velocity in Marine Sediment
Japanese Journal of Applied Physics, 2006The shear wave velocity in surficial marine sediment is important evaluating the physical properties of such sediment. In this study, the dispersion of the shear wave velocity is investigated using the Biot–Stoll model. Next, the shear wave velocities of air- and water-saturated beach sands are measured at a low overburden stress, and the shear moduli ...
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Means for obtaining shear wave velocities
The Journal of the Acoustical Society of America, 1989The present invention provides a method of logging a subterranean formation through a wellbore containing a fluid, wherein no shear wave signal is obtainable utilizing conventional sonic well logging tools suspended in the wellbore. The shear wave signal is not obtainable usually because the acoustic velocity of the wellbore fluid is greater than the ...
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Shear wave velocities in the lower mantle
Bulletin of the Seismological Society of America, 1969abstract The Large Aperture Seismic Array in eastern Montana was used to measure the travel times and dT/dΔ of earthquake-generated shear waves for the purpose of determining lower-mantle shear velocities. The data were limited to epicentral distances between 27 and 95 degrees.
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Seafloor shear wave velocity variability.
The Journal of the Acoustical Society of America, 1992In gross classification, sediments of the deep seafloor may be of terrigenous or marine origin. Those of marine origin are classified as oozes (generally calcareous) or clays (generally siliceous) depending largely on whether their CaCO3 content is greater or less than 30%.
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Shear Wave Velocities of Campanian Tuffs (Southern Italy)
1st EEGS Meeting, 1995Shear wave velocities of Campanian tuffs were measured both in the laboratory (ultrasonic pulse and resonant column) and in the field (Rayleigh wave spectral analysis). It resulted that it is not sufficient to recognize the tuff basement for computing the site amplification effects, but the dynamic parameters have to be measured because of hardening ...
Guadagno F. M. +2 more
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