Development of a Geographic Information System-based Virtual Geotechnical Database and assessment of liquefaction potential for the St. Louis Metropolitan area

by Chung, Jae-Won, Ph.D., UNIVERSITY OF MISSOURI - ROLLA, 2007, 156 pages; 3298485

Abstract:

The St. Louis Metropolitan area is the focus the U.S. Geological Survey's Earthquake Hazard Program's plan for assessing and reducing the likely risks of an earthquake likely emanating from New Madrid Seismic Zone (NMSZ), which is the most active seismic zone in the Midwestern United States. The St. Louis Metropolitan area consists of three counties in Missouri and three in Illinois, which are divided by the state boundary along the Mississippi River. Both of the state's respective geological surveys have produced their own geologic maps and datasets, employing dissimilar geodata information and systems, with differing map units, map scales, and storage formats, with data stored in hard copy (analog) or digital formats. This combined dissimilar geodata from both states and integrate them into a single Virtual Geotechnical Database (VGDB) in an accepted Geographic Information System (ArcGIS), which can be used to retrieve subsurface data and perform an array of spatial analyses. The VGDB will be made available to the general public and other researchers, and is intended to promote more standardization of geologic interpretations between Missouri and Illinois. The existing body of data was manipulated to extract useful information on the surficial geology, loess thickness, bedrock geology, and well locations in the St. Louis Metro area, which were integrated into a GIS ‘information layer.’ Measured values of shear wave velocity (VS) were gathered to assess soil amplification based on NEHRP site classes. Groundwater elevations and depths-to-bedrock basement underling the study area were interpolated using geostatistical methods of kriging and cokriging. The liquefaction potential was also assessed for the study area, estimating the liquefaction potential index (LPI), which is derived from the correlation between LPI values and the depths to groundwater.

AdviserJ. David Rogers
SchoolUNIVERSITY OF MISSOURI - ROLLA
Source TypeDissertation
SubjectsGeology; Geotechnology; Civil engineering
Publication Number3298485

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