Modeling Dynamic Properties of South Carolina Coastal Plain Sediments for Ground Response Analysis
Publication: Geo-Congress 2022
ABSTRACT
This paper presents the dynamic properties of the Cretaceous and Tertiary sediments in the South Carolina Coastal Plain (SCCP). At many locations in the SCCP, the depth to the top of firm-rock (i.e., small-strain shear-wave velocity, VS > 760 m/s) is over 150 m, making field exploration to this reference condition often not feasible. Base case VS profiles are developed using 113 profiles gathered from 65 reports. Of the 113 profiles, 55 extend into the Tertiary above the base of the Santee Limestone, and 70 extend into older, unlithified sediments. The time-averaged VS in the top 30 m (VS30) for the base case profiles of the two groups are 354 and 385 m/s, respectively. These VS30 values characterize our shallower base case reference outcrop conditions in the SCCP. Shear-modulus reduction and material damping curves are based on previous studies, including test results obtained from three recent reports by other investigators. The results are combined with surface contour maps to form a geology-based dynamic property model. The model is being used to develop statewide seismic hazard maps of the reference outcrop conditions for the SC Department of Transportation.
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Geo-Congress 2022
Pages: 695 - 707
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Published online: Mar 17, 2022
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