Table 1: Correlations between 𝑉 𝑠 and SPT 𝑁 value for all types of soil.

Imai [6] 𝑉 𝑠 = 9 1 . 0 𝑁 0 . 3 3 7
Ohta and Goto [7] 𝑉 𝑠 = 8 5 . 3 5 𝑁 0 . 3 4 8
Imai and Tonouchi [8] 𝑉 𝑠 = 9 7 . 0 𝑁 0 . 3 1 4