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Site effects at a vertical accelerometer array near Paducah, Kentucky |
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| Authors: | R Street Z Wang E Woolery J Hunt and J Harris |
| Institution: | aDepartment of Geological Sciences/Kentucky Geological Survey, University of Kentucky, Lexington, KY 40506-0053, USA bDepartment of Geological Sciences, University of Kentucky, Lexington, KY 40506-0053, USA cMartin Marietta Energy Systems, Inc., P.O. Box 2003, Oak Ridge, TN 37831-7294, USA dMillsaps College, 1701 North State St., Jackson, MS 39210-0001, USA |
| Abstract: | The downhole vertical accelerometer array VSAP near Paducah, KY, consists of three-component accelerometers at the surface, the top of the McNairy Formation (−41 m), and the top of the Paleozoic bedrock (—99 m). The array is at the northern end of the Mississippi Embayment, and it was installed to verify the ground-motion modeling for the site, assuming a significant earthquake in the New Madrid Seismic Zone. Accelerograms from 4.2 and 2.0 mb earthquakes were used to check aspects of the modeling pertaining to linear behavior of the soil column, and to review the soil column models derived by drilling and geotechnical methods and through the use of high-resolution P- and SH-wave seismic refraction in reflection techniques. Results of the study indicate that for the linear case the soil column models derived by the two techniques are equivalent, and that the most important boundary in the soil column, with respect to amplification of the ground motions, is the interface between the limestone bedrock and soil. |
| Keywords: | Site effects Vertical accelerometer array Paducah Kentucky |
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