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Assessment of Liquefaction Potential during Earthquakes by Arias Intensity

By Robert E. Kayen,1 Member, ASCE, and James K. Mitchell,2 Honorary Member, ASCE

1Res. Civ. Engr., U.S. Geological Survey, 345 Middlefield Rd., Menlo Park, CA 94025.
2University Distinguished Prof., Virginia Tech, 109B Patton Hall, Blacksburg, VA 24061-0105.

This paper is part of the Journal of Geotechnical and Geoenvironmental Engineering, Vol. 123, No. 12, December 1997. ©ASCE, ISSN 1090-0241/97/0012-1162-1174/$4.00 + $.50 per page. Paper No. 13983. This abstract is reproduced by permission of the publisher, ASCE

ABSTRACT: An Arias intensity approach to assess the liquefaction potential of soil deposits during earthquakes is proposed, using an energy-based measure of the severity of earthquake-shaking recorded on seismograms of the two horizontal components of ground motion. Values representing the severity of strong motion at depth in the soil column are associated with the liquefaction resistance of that layer, as measured by in situ penetration testing (SPT, CPT). This association results in a magnitude-independent boundary that envelopes initial liquefaction of soil in Arias intensity-normalized penetration resistance space. The Arias intensity approach is simple to apply and has proven to be highly reliable in assessing liquefaction potential. The advantages of using Arias intensity as a measure of earthquake- shaking severity in liquefaction assessment are: Arias intensity is derived from integration of the entire seismogram wave form, incorporating both the amplitude and duration elements of ground motion; all frequencies of recorded motion are considered; and Arias intensity is an appropriate measure to use when evaluating field penetration test methodologies that are inherently energy-based. Predictor equations describing the attenuation of Arias intensity as a function of earthquake magnitude and source distance are presented for rock, deep-stiff alluvium, and soft soil sites. ©1997 American Society of Civil Engineers

For more information about this paper or to view the entire article please contact Robert Kayen. To purchase the article please visit the ASCE Journal site.

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