Sr. No

Soil Type (S)

Seismic Factors (Z)

1

Hard Rock (S1)

0.075 gravitational acceleration (Z1)

2

Rock (S2)

0.150 gravitational acceleration (Z2)

3

Very dense soil and soft rock (S3)

0.20 gravitational acceleration (Z3)

4

Stiff soil (S4)

0.30 gravitational acceleration (Z4)

5

Soft soil (S5)

0.40 gravitational acceleration (Z5)