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Liquefaction Options - CPT

The following additional correction factors can be applied when performing a liquefaction analysis with CPT data:

Magnitude Scaling Factor (MSF)

The Magnitude Scaling Factor is used to adjust the CSR or CRR to an earthquake magnitude value of M=7.5.

The following options are available for MSF:

  • None
  • Tokimatsu and Seed (1987)
  • Idriss (1999)
  • Andrus Stokoe (1997)
  • Idriss and Boulanger (2008)
  • Idriss (NCEER)
  • Idriss and Boulanger (2014)

Stress Reduction Factor (Rd)

Rd is the shear stress reduction coefficient, and is used to determine the maximum shear stress at different depths. Typically, values range from 1 at the ground surface to lower values at greater depths.

The following calculation methods are available for Rd:

  • NCEER (1997)
  • Idriss (1999)
  • Kayen (1992)
  • Cetin et al. (2004)
  • Liao and Whitman (1986)
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