Results 261 to 270 of about 220,127 (302)
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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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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 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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Measuring Shear Wave Velocity Using Bender Elements
Geotechnical Testing Journal, 2005Abstract The use of bender element to measure shear wave velocity is popular due to its simplicity. However, there are still some uncertainties in the interpretation of the bender element test. In this paper, the use of bender elements in the determination of shear wave velocities of dry, unsaturated, and saturated soil specimens is ...
Leong, Eng Choon +2 more
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Prediction of the Shear Wave Velocity V
2013The paper examines the correlations to obtain rough estimates of the shear wave velocity VSfrom non-seismic dilatometer tests (DMT) and cone penetration tests (CPT). While the direct measurement of VSis obviously preferable, these correlations may turn out useful in various circumstances.
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Estimation of shear wave velocity in shallow marine sediments
IEEE Journal of Oceanic Engineering, 1994A method for estimating shear wave velocity in shallow marine sediments from the dispersive characteristics of seismic interface waves traveling at the water/sediment boundary is presented. Interface waves are recorded using an array of geophones placed on the seafloor, and the shear wave velocity is estimated by a nonlinear least-square inversion ...
CAITI, ANDREA, Akal T, Stoll RD
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Shear wave velocity measurement of upper trapezius muscle by color Doppler shear wave imaging
Journal of Medical Ultrasonics, 2017Skeletal muscle stiffness is thought to be the result of increased tissue hardness, but measurement accuracy has been dependent on operator technique. We have proposed a novel shear wave real-time imaging method (color Doppler shear wave imaging: CD SWI) with continuous shear waves excited from the tissue surface by a mechanical vibrator.Using the ...
Atsushi, Yamamoto +9 more
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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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Impact of Small Shear Wave Velocity Variations on Surface Wave Phase Velocity Inversion
24th European Meeting of Environmental and Engineering Geophysics, 2018Summary Surface wave methods have attracted a lot of geophysicists’ attention for the purpose of monitoring civil engineering structures, because they represent the most energetic part of the seismic signal, and contain information on shallow media. In order to infer the mechanical properties of the medium as a function of depth, an inverse procedure ...
A. Wang +3 more
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Using refracted shear waves for velocity estimation
Geophysical Prospecting, 2001The most difficult part of multicomponent processing is the estimation of the shear‐wave velocity map for migration. We used refracted shear waves and a simple iterative method called wavefield continuation (WFC) to evaluate the shallow shear‐wave velocity profile on a real data example.
L. Pautet, W.A. Kuperman, L. Dorman
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