Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 87 for “"Shear wave velocity"”.
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Development of Deep Shear Wave Velocity Profiles and an Approach to Generate Site Signature Consistent Pseudo Shear Wave Velocity Profiles in the Mississippi Embayment
… details the development of a surface wave method (SWM) technique to generate deep shear wave velocity profiles (VS profiles), applying this technique at 24 sites across the Mississippi embayment and developing an approach to generate pseudo site signature consistent VS profiles from …
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Ultrasonic Methods to Measure Shear Wave Velocity and Absorption for Tissue Viscoelasticity Characterization
… ultrasound methods, generating and tracing a shear wave (SW) propagating within the soft tissue was one of the promising approaches to measure the SW velocity and absorption, which were the key parameters to derive the tissue viscoelasticity. When the SW method was employed, several problems, …
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Shallow 3D Shear Wave Velocity Model and Revised Site Period Prediction Map for the Mexico City Basin
… prediction map and to develop a shallow 3D shear wave velocity model of the Mexico City Basin. To accomplish this goal, an extensive literature review was performed to compile as much pertinent shear wave velocity and site period data for the region. In total, 75 sites were used to revise …
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Development of Deep Site Specific and Reference Shear Wave Velocity Profiles in the Canterbury Plains, New Zealand
<p>Deep (typically >1000 m) shear wave velocity profiles were developed across the Canterbury basin at nine strong motion stations using a combination of active and passive surface wave methods and horizontal to vertical spectral ratio measurements. A multi-mode, multi-method joint inversion …
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Uncertainties in the Estimation of the Shear-Wave Velocity and the Small-Strain Damping Ratio from Surface Wave Analysis
L'abstract è presente nell'allegato / the abstract is in the attachment
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Sensitivity tests between Vs30 and detailed shear wave profiles using 1D and 3D site response analysis, Las Vegas Valley
… aspect of hazard analysis and the time-averaged shear-wave velocity to 30 m depth "Vs30" for site-class has become a critical parameter in site-specific and probabilistic hazard analysis. Yet, the general applicability of Vs30 can be ambiguous and much debate and research surround its …
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Influence of grain size evolution and water content on the seismic structure of the oceanic upper mantle
… dominant deformation mechanism, attenuation, and shear wave velocity of the oceanic upper mantle. Several studies have investigated the kinetics of grain size evolution, but have yet to incorporate these evolution equations into large-scale flow models of the oceanic upper mantle. We construct …
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Influence of grain size evolution and water content on the seismic structure of the oceanic upper mantle
… dominant deformation mechanism, attenuation, and shear wave velocity of the oceanic upper mantle. Several studies have investigated the kinetics of grain size evolution, but have yet to incorporate these evolution equations into large-scale flow models of the oceanic upper mantle. We construct …
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AN ACOUSTIC METHOD FOR IDENTIFYING SAND FABRIC AND LIQUEFACTION POTENTIAL
… and saturated samples, using compressional and shear wave transducers. The latter were developed specifically for the test program and included a 4 bender bimorph array as the shear wave crystal. The samples were then tested to liquefaction under undrained, stress controlled, cyclic triaxial …
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Refraction Microtremor Analysis of Areas Surrounding California State University San Bernardino
… of ground motion caused by seismic activity via wave propagation through the subsurface. These seismic hazards are being addressed via the Alquist-Priolo Earthquake Faulting Zone Act and the National Earthquake Hazards Reduction Program (NEHRP). Shear wave velocity of the subsurface has served as …
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Continental Magmatism and Dynamic Topography
… uplift is often expressed by positive long-wavelength gravity anomalies, radial drainage patterns, and slow seismic velocity anomalies within the upper mantle. Volcanic activity and elevated heat flow are also often observed. The aim of this study is to investigate the link between …
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Learning Structures : fusing deconvolution-based seismic interferometry with Bayesian inference for structural health assessment
… approach is employed to obtain the wave-forms that represent the impulse response functions (IRFs) with respect to a reference excitation source. Using the deconvolved waveforms, key structural characteristics that correspond to the current state of the structure (e.g., shear wave …
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Acoustic Radiation Force Impulse-Driven Shear Wave Velocimetry in Cardiac Tissue
… to generated transverse-traveling mechanical waves in various biological tissues. The velocity of these waves is related to a medium's stiffness and thus can offer useful diagnostic information. Consequently, shear wave velocimetry has the potential to investigate cardiac disease states that …
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Near-surface void characterization and sensitivity analysis using enhanced processing procedures on passive Multi-Channel Analysis of Surface Waves (MASW) data
… on passive multichannel analysis of surface-waves (MASW) data were utilized to identify velocity anomalies above known salt solution voids in Hutchinson, Kansas, likely caused by the changing stress field due to the migration and/or expansion of the void. Previous geophysical studies within …
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Analysis of effect of using estimated shear wave data as compared to measured compressional and shear wave sonic log
… to wrong interpretation. One of such data is the shear wave velocity which in most cases is collected with the compressional wave velocity. The measured shear wave velocity log may contain errors that are due to drilling conditions, mud invasion etc. It may also contain cycle skips and might …
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Influence of soil parameters on the motion of rocking walls
… motion of a rocking wall. The influence of the shear wave velocity and the Poisson ratio will be considered. The flexible soil medium is modeled with the finite element method, using a 2D plain strain analysis. In order to be able to use a reasonably fine mesh, the dimensions of the soil island …
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A quasi-dynamic and self-consistent rupture model to simulate earthquake ruptures
… on the rupture physics as the rupture velocity, frictions or tractions acting during the rupture process. Nevertheless, as often based on spatial gridded preset geometries, dynamic modeling is depending on many free parameters leading to both a high non-uniqueness of the results and …
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Improving seismic site response analysis for non-standard sites
… at the basis of a structure is how the seismic waves will be affected by travelling through soil deposits near the surface. In fact, these near-surface layers act as a filter modifying (amplify/de-amplify) the input motion and leading to modified ground motions at the ground surface. Hence, the …
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A comparison of proxies for seismic site conditions and amplification for the large urban area of Santiago de Chile
… By inverting the noise spectral rations, local shear wave velocity profiles could be derived under the constraint of the thickness of the sedimentary cover which had previously been determined by gravimetric measurements. The resulting 3D model was derived by interpolation between the single …
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