Conditional mean spectra in site-specific seismic hazard evaluation for a major river crossing in the central United States

Youssef M.A. Hashash, Norman A. Abrahamson, Scott M. Olson, Steve Hague, Byungmin Kim

Research output: Contribution to journalArticlepeer-review

Abstract

Current seismic design practice of ten relies on the use of the uniform hazard response spectrum (UHRS), which implicitly includes motions from multiple earthquake sources and envelops possible spectra, yet does not represent a single event. Seismic hazard analyses at the site of a major Mississippi River crossing near St. Louis, Missouri, showed bimodal seismic hazard dominated by small, nearby earthquakes at short periods and large, distant earthquakes in the New Madrid seismic zone at long periods. UHRS motions resulted in large seismic demands and predictions of pervasive liquefaction that were inconsistent with historical and geologic records. UHRS-compatible conditional mean spectra (CMS) were developed to bridge deterministic and probabilistic seismic hazard evaluations, and used to evaluate liquefaction, lateral spreading, and settlement potential. The computed response was consistent with the historical and geologic record. CMSs of fer hazard-compatible alternatives to the UHRS and result in seismic demand consistent with historical and geologic evidence.

Original languageEnglish (US)
Pages (from-to)47-69
Number of pages23
JournalEarthquake Spectra
Volume31
Issue number1
DOIs
StatePublished - Feb 1 2015

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Geophysics

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