Researcher

Correlation

Kanai (1966)

V_s = 19N^0.6

Ohba and Toriumi (1970)

V_s = 84N^0.31

Imai and Yahimura (1970)

V_s = 76N^0.33

Fujimara (1972)

V_s = 92.1N^0.337

Ohsaki and Iwasaki (1973)

V_s = 81.4N^0.39

Imai and Yoshimura (1975)

V_s = 92N^0.329

Imai et al. (1975)

V_s = 89.9N^0.341

Imai (1977)

V_s = 91N^0.337

Ohta and Goto (1978)

V_s = 85.35N^0.348

Seed and Idriss (1981)

V_s = 61.4N^0.5

Imai and Tonouchi (1982)

V_s = 97N^0.314

Imai and Yoshimura (1990)

V_s = 76N^0.33

Yokota et al. (1991)

V_s = 121N^0.27

Kalteziotis et al. (1992)

V_s = 76.2N^0.24

Athanasopoulos (1995)

V_s = 107.6N^0.36

Sisman (1995)

V_s = 32.8N^0.51

Iyisan (1996)

V_s = 51.5N^0.516

Jafari et al. (1997)

V_s = 22N^0.85

Kiku et al. (2001)

V_s = 68.3N^0.292

Hasancebi and Ulusay (2007)

V_s = 90N^0.309

Hanumantharao and Ramana (2008)

V_s = 82.6N^0.43

Lee and Tsai (2008)

V_s = 137.153N^0.229

Dikmen (2009)

V_s = 58N^0.39

Uma Maheswari et al. (2010)

V_s = 95.64N^0.301

Tsiambaos and Sabatakakis (2011)

V_s = 105.7N^0.327

Anbazhagan et al. (2012)

V_s = 68.96N^0.51