Evansville Area Earthquake Hazards Mapping Project (EAEHMP)— Progress report, 2008

Open-File Report 2009-1249
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Maps of surficial geology, deterministic and probabilistic seismic hazard, and liquefaction potential index have been prepared by various members of the Evansville Area Earthquake Hazard Mapping Project for seven quadrangles in the Evansville, Indiana, and Henderson, Kentucky, metropolitan areas. The surficial geologic maps feature 23 types of surficial geologic deposits, artificial fill, and undifferentiated bedrock outcrop and include alluvial and lake deposits of the Ohio River valley. Probabilistic and deterministic seismic hazard and liquefaction hazard mapping is made possible by drawing on a wealth of information including surficial geologic maps, water well logs, and in-situ testing profiles using the cone penetration test, standard penetration test, down-hole shear wave velocity tests, and seismic refraction tests. These data were compiled and collected with contributions from the Indiana Geological Survey, Kentucky Geological Survey, Illinois State Geological Survey, United States Geological Survey, and Purdue University. Hazard map products are in progress and are expected to be completed by the end of 2009, with a public roll out in early 2010. Preliminary results suggest that there is a 2 percent probability that peak ground accelerations of about 0.3 g will be exceeded in much of the study area within 50 years, which is similar to the 2002 USGS National Seismic Hazard Maps for a firm rock site value. Accelerations as high as 0.4-0.5 g may be exceeded along the edge of the Ohio River basin. Most of the region outside of the river basin has a low liquefaction potential index (LPI), where the probability that LPI is greater than 5 (that is, there is a high potential for liquefaction) for a M7.7 New Madrid type event is only 20-30 percent. Within the river basin, most of the region has high LPI, where the probability that LPI is greater than 5 for a New Madrid type event is 80-100 percent.

Study Area

Publication type Report
Publication Subtype USGS Numbered Series
Title Evansville Area Earthquake Hazards Mapping Project (EAEHMP)— Progress report, 2008
Series title Open-File Report
Series number 2009-1249
DOI 10.3133/ofr20091249
Year Published 2009
Language English
Publisher U.S. Geological Survey
Contributing office(s) National Earthquake Information Center
Description iv, 16 p.
Time Range Start 2008-01-01
Time Range End 2008-12-31
Country United States
State Indiana, Kentucky
City Evansville
Online Only (Y/N) Y
Google Analytic Metrics Metrics page
Additional publication details