Since the CSR and CRR7.5 are provided for earthquake magnitude of 7.5, a Magnitude Scaling Factor should be multiplied at CRR7.5 to adjust its value for the target earthquake magnitudes. NovoLiq covers the following MSF methods:

 

Tokimatsu & Seed (1987)

2.5-0.2M

Idriss (NCEER 1997)

(7.5 / M) ^ 2.56

Idriss & Boulanger (2008)

MSF = 6.9 e (-M/4) - 0.058 < 1.8

Idriss & Boulanger (2014)

MSF = 1+(MSFmax - 1){8.64 e (-M/4) - 1.325}

 

MSFmax = 1.09 + (N1_60cs/31.5)^2 < 2.2

 

 

other methods (source : NCEER 1997 report):

 

Please note for clay-like material, MSF recommended by Idriss and Boulanger 2014 is used:

MSF = 1.12 e (-M/4)+0.828 < 1.13