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 11 of 11 for “"Shear wave velocity (VS)"”.
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Improving resolution of stiff layers in soil profiles through multi-step inversion of Sasw data
… layers through inversion of seismic surface wave data to generate one-dimensional shear wave velocity (VS) profiles; The inversion algorithms begin with a starting model. Development of a high-quality starting model helps ensure good results; Two inversion methods, simulated annealing (SA) …
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Evaluation of cyclic behavior of dense sands under multidirectional loading using centrifuge tests
… coarse-grained soil depends on the soil’s cyclic shear stress – shear strain – volumetric strain response. NPPs founded on a thick deposit of dense coarse-grained soil may experience nontrivial settlements due to small, but accumulated volumetric strains during an earthquake. Studies that have …
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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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Development of instrumented oedometer incorporated with bender element and electrical conductivity
… poor geotechnical properties such as low shear strength and high compressibility. Solidification, using hydraulic binders could be adopted to improve these poor properties. The compressibility of soil is quantified by the settlement reduction due to the application of vertical load. …
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Characterization of soft soil using multi-channel analysis of surface waves (MASW) and electrical resistivity method (ERM)
… concentrates on the determination of soft soil shear-wave velocity (Vs) profile using the multi-channel analysis of surface waves (MASW) and the soil stratigraphy using Electrical Resistivity Method (ERM). The soft soil Vs and stratigraphy were determined and correlated with the peat sampler and …
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Improvements to the Assessment of Site-Specific Seismic Hazards
… numerically accommodate the mechanics behind the wave propagation phenomena near the surface as well as the variability associated with the input motion and soil properties. As a result, SRA constitute a key component of the assessment of site-specific seismic hazards within the probabilistic …
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Geotechnical Characterisation of Pumiceous Soils for Liquefaction Assessment
… tests, such as cone penetration tests (CPT) and shear wave velocity (Vs) profiling, which were conducted at the same sites where the undisturbed samples were collected. For comparison purposes, similar laboratory tests were also performed on hard-grained Toyoura sand. The laboratory-based results …
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Advanced analysis of complex seismic waveforms to characterize the subsurface Earth structure
This thesis includes three major parts, (1) Body wave analysis of mantle structure under the Calabria slab, (2) Spatial Average Coherency (SPAC) analysis of microtremor to characterize the subsurface structure in urban areas, and (3) Surface wave dispersion inversion for shear wave velocity …
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Microtremor recordings in Northern Mississippi: Evaluating site effect and correlating with wave climate
… the horizontal to vertical spectral ratio (HVSR) method is applied to find the predominant frequency (f0) and roughly estimate amplification factor as HVSR value at f0 (HVSR@f0). Within Northern Mississippi area, the f0 is tightly correlated with unconsolidated sediments thickness (UST) and …
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Nonlinear site amplification functions for Central and Eastern North America
… This study describes the process for generating VS profiles, soil and weathered rock material properties, and ground motions to represent the variability and uncertainty of site conditions in CENA. The second part of this study is the modeling of the site response simulation data with linear and …