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Article
Simplified Method for Spatial Evaluation of Liquefaction Potential in the St. Louis Area
Journal of Geotechnical and Geoenvironmental Engineering
  • Jaewon Chung
  • J. David Rogers, Missouri University of Science and Technology
Abstract

As a part of an earthquake hazard mapping program being undertaken by the U.S. Geological Survey in the St. Louis metropolitan area, surficial geologic mapping and subsurface geotechnical data have been compiled into a three-dimensional geographic information system (GIS). The potential for soil liquefaction was then spatially evaluated by using subsurface information from 562 boreholes for an assumed M7.5 earthquake emanating from the New Madrid Seismic Zone. Geotechnical data (standard penetration test N-values, overburden pressure, and depth-to-groundwater) and the scenario peak ground accelerations (PGA=0.1, 0.20, and 0.30 g) were applied to evaluate the factor of safety (FS) against earthquake-induced liquefaction. The liquefaction potential index (LPI) method was used in these evaluations because it allows for calculations of FS with depth for 10-25 discrete stratigraphic horizons overlying the bedrock across the St. Louis metropolitan area. LPI values were derived from the correlation between calculated LPI values and the depths-to-groundwater within late Quaternary stratigraphic units. The St. Louis metropolitan area was then classed according to four levels of severity of risk from liquefaction: (1) no liquefaction potential, (2) little-to-no likelihood, (3) moderate, and (4) severe.

Department(s)
Geosciences and Geological and Petroleum Engineering
Keywords and Phrases
  • Hazard Mapping,
  • Liquefaction Potential Index,
  • St. Louis Metropolitan Area,
  • Water Depth,
  • Earthquake Hazard,
  • Factor of Safety,
  • Geologic Mapping,
  • Geotechnical Data,
  • Late Quaternary,
  • New Madrid Seismic Zones,
  • Overburden Pressures,
  • Peak Ground Acceleration,
  • Simplified Method,
  • Standard Penetration Test,
  • Stratigraphic Units,
  • Subsurface Information,
  • U.s. Geological Surveys,
  • Geographic Information Systems,
  • Geological Surveys,
  • Soil Liquefaction,
  • Earthquake Magnitude,
  • Missouri,
  • United States
Geographic Coverage
St. Louis, Missouri
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2011 American Society of Civil Engineers (ASCE), All rights reserved.
Publication Date
5-1-2011
Publication Date
01 May 2011
Disciplines
Citation Information
Jaewon Chung and J. David Rogers. "Simplified Method for Spatial Evaluation of Liquefaction Potential in the St. Louis Area" Journal of Geotechnical and Geoenvironmental Engineering Vol. 137 Iss. 5 (2011) p. 505 - 515 ISSN: 1090-0241
Available at: http://works.bepress.com/j-rogers/66/