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Development of Shear-Wave Velocity Profiles for Computing Amplification Factors for Reference Site to Local Site Conditions in South Carolina
This paper presents the development of base case shear-wave velocity (VS) profiles for computing seismic amplification factors for reference site to local site conditions in the state of South Carolina. As part of an ongoing statewide hazard mapping study for the South Carolina Department of Transportation, the reference site conditions were characterized using time-averaged, shear-wave velocity in the top 30 m (VS30) of 1,183 to 1,518 m/s for different general rock types in the South Carolina Blue Ridge and Piedmont (SCBRP) provinces, and 345 and 385 m/s for younger tertiary sediments and older sediments, respectively, in the South Carolina Coastal Plain (SCCP) province. In this paper, a total of 189 VS profiles are compiled from various project reports and used to characterize the residual soil and saprolite that overlie partially weathered rock in the SCBRP and the quaternary soil that overlie tertiary and cretaceous sediments in the SCCP. The resulting median VS profile ranges from 253 m/s near the ground surface to 402 m/s at a depth of 30 m for residual soil/saprolite, and from 170 m/s near the ground surface to 215 m/s at a depth of 25 m for quaternary soil. The transitions from soil to reference site conditions are also modeled. To capture the epistemic uncertainty in VS and variations in depth to the reference site conditions, two sets of base case VS profiles are proposed for the SCBRP and SCCP.
Development of Shear-Wave Velocity Profiles for Computing Amplification Factors for Reference Site to Local Site Conditions in South Carolina
This paper presents the development of base case shear-wave velocity (VS) profiles for computing seismic amplification factors for reference site to local site conditions in the state of South Carolina. As part of an ongoing statewide hazard mapping study for the South Carolina Department of Transportation, the reference site conditions were characterized using time-averaged, shear-wave velocity in the top 30 m (VS30) of 1,183 to 1,518 m/s for different general rock types in the South Carolina Blue Ridge and Piedmont (SCBRP) provinces, and 345 and 385 m/s for younger tertiary sediments and older sediments, respectively, in the South Carolina Coastal Plain (SCCP) province. In this paper, a total of 189 VS profiles are compiled from various project reports and used to characterize the residual soil and saprolite that overlie partially weathered rock in the SCBRP and the quaternary soil that overlie tertiary and cretaceous sediments in the SCCP. The resulting median VS profile ranges from 253 m/s near the ground surface to 402 m/s at a depth of 30 m for residual soil/saprolite, and from 170 m/s near the ground surface to 215 m/s at a depth of 25 m for quaternary soil. The transitions from soil to reference site conditions are also modeled. To capture the epistemic uncertainty in VS and variations in depth to the reference site conditions, two sets of base case VS profiles are proposed for the SCBRP and SCCP.
Development of Shear-Wave Velocity Profiles for Computing Amplification Factors for Reference Site to Local Site Conditions in South Carolina
Sedaghat, Ali (author) / Amevorku, Camilius (author) / Andrus, Ronald (author) / Wong, Ivan (author) / Rix, Glenn (author) / Carlson, Clinton (author) / Ravichandran, Nadarajah (author) / Harman, Nicholas (author)
Geo-Congress 2023 ; 2023 ; Los Angeles, California
Geo-Congress 2023 ; 207-216
2023-03-23
Conference paper
Electronic Resource
English
| British Library Conference Proceedings | 2023
| British Library Conference Proceedings | 2022