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Lithology and Shear-Wave Velocity in Memphis, Tennessee

U.S. Geological Survey
3876 Central Ave., Suite 2
Memphis, Tennessee 38152-3050
(J.G., E.S., R.S., C.C.)

Ground Water Institute
The University of Memphis
300 Engineering Admin. Bldg.
Memphis, Tennessee 38152-3170
(B.W.)

Center for Earthquake Research & Information
The University of Memphis
3876 Central Ave., Suite 1
Memphis, Tennessee 38152-3050
(H.H., K.T.)

U.S. Geological Survey
640 Grassmere Park Dr.
Nashville, Tennessee 37211
(A.W., M.B.)

Dept. of Earth Sciences
The University of Memphis
113 Johnson Hall
Memphis, Tennessee 38152
(R.V.)

U.S. Geological Survey
MS 966
Box 25046
Denver Federal Center
Denver, Colorado 80225
(R.U., J.O., W.S., R.W.)

47 Woodbriar Court
Nicholasville, Kentucky 40356
(R.S.)

School of Civil & Environmental Eng.
Georgia Institute of Technology
Atlanta, Georgia 30332-0355
(P.M.)

U.S. Geological Survey
7777 Walnut Grove Rd.
Memphis, Tennessee 38120
(S.H.)

We have derived a new three-dimensional model of the lithologic structure beneath the city of Memphis, Tennessee, and examined its correlation with measured shear-wave velocity profiles. The correlation is sufficiently high that the better-constrained lithologic model may be used as a proxy for shear-wave velocities, which are required to calculate site-amplification for new seismic hazard maps for Memphis. The lithologic model and its uncertainties are derived from over 1200 newly compiled well and boring logs, some sampling to 500 m depth, and a movingleast-squares algorithm. Seventy-six new shear-wave velocity profiles have been measured and used for this study, most sampling to 30 m depth or less. All log and velocity observations are publicly available via new web sites.