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Seismic and Liquefaction Hazard Maps for Four Western Tennessee Counties

Session: How Well Can We Assess Site Effects So Far? [Poster]

Type: Poster

Date: 4/21/2021

Presentation Time: 03:45 PM Pacific

Description: 

A five-year seismic and liquefaction hazard mapping project for five western Tennessee counties began in 2017 under a Disaster Resilience Competition grant from the U.S. Department of Housing and Urban Development to the State of Tennessee. The project supports natural hazard mitigation efforts in Lake, Dyer, Lauderdale, Tipton, and Madison counties. The county seismic hazard maps for Lake County in northwestern most Tennessee were completed in early 2018. Similar maps for Dyer County were completed in 2019. Maps for Lauderdale County were completed in early 2020 and for Tipton County in early 2021. Additional geological, geotechnical, and geophysical information has been gathered in Lake, Dyer, Lauderdale, and Tipton Counties to improve the base northern Mississippi Embayment hazard maps of Dhar and Cramer (2017). Information gathered includes additional geological and geotechnical subsurface exploration logs, water table level data collection, new measurements of shallow and deep shear-wave velocity (Vs) profiles, and the compilation of existing Vs profiles in and around the counties. Improvements have been made in the 3D geological model, water table model, the geotechnical liquefaction probability curves, and the Vs correlation with lithology model for these counties. The resulting improved soil response amplification distributions on a 0.5 km grid were combined with the 2014 U.S. Geological Survey seismic hazard model (Petersen et al., 2014) earthquake sources and attenuation models to add the effect of local geology for Lake, Dyer, and Lauderdale Counties. The resulting products will be similar to the Memphis and Shelby County urban seismic hazard maps recently updated by Cramer et al. (2018).

Presenting Author: Chris H. Cramer

Student Presenter: No

Authors