Sediment thickness and ground motion site amplification along the United States Atlantic and Gulf Coastal Plains
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Abstract
Past and present research on earthquake ground motions along the Atlantic and Gulf Coastal Plains and Mississippi Embayment show significant period-dependent site response that is not presently accounted for in ground motion models. These deviations are strongly correlated with the thickness of Mesozoic and younger syn- and post-rift sediments. With the recent incorporation of deep basin depth measurements in the U.S. Geological Survey National Seismic Hazard Model for select regions in the western United States, we move toward a similar analysis in the greater Coastal Plains region by constructing a sediment thickness model and considering three new site response models conditioned on sediment thickness. As of the preparation of this conference paper, we have performed a preliminary evaluation of the Chapman and Guo model and find that the predicted ratio between pseudo-spectral accelerations for the Coastal Plains relative to the continental interior are broadly consistent with our independent dataset.
Suggested Citation
Boyd, O.S., Churchwell, D.H., Moschetti, M.P., Thompson, E.M., Pratt, T.L., Chapman, M.C., Rezaeian, S., 2022, Sediment thickness and ground motion site amplification along the United States Atlantic and Gulf Coastal Plains, in Proceedings of the 12th National Conference on Earthquake Engineering, June 27–30, 2022, Salt Lake City, UT, 6 p.
Study Area
| Publication type | Conference Paper |
|---|---|
| Publication Subtype | Conference Paper |
| Title | Sediment thickness and ground motion site amplification along the United States Atlantic and Gulf Coastal Plains |
| Year Published | 2022 |
| Language | English |
| Publisher | Earthquake Engineering Research Institute |
| Contributing office(s) | Geologic Hazards Science Center - Seismology / Geomagnetism |
| Description | 6 p. |
| Larger Work Type | Book |
| Larger Work Subtype | Conference publication |
| Larger Work Title | Proceedings of the 12th National Conference on Earthquake Engineering |
| Conference Title | 12th National Conference on Earthquake Engineering |
| Conference Location | June 27–30, 2022 |
| Conference Date | Salt Lake City, UT |
| Country | United States |
| Other Geospatial | Atlantic and Gulf Coastal Plains |