4.1 Midorikawa et al. (1994)

1) References

S. Midorikawa, M. Matsuoka and K. Sakugawa, 1994, Site Effects on Strong-Motion Records Observed During the 1987 Chhiba-Ken-Toho-Oki, Japan Earthquake, Proc. 9th Japan Earthq. Eng. Symp., E-085 - E-090.

2) Used strong motion data

- 1987 Chiba-ken-toho-oki Earthquake

- Number of records: 173 points

- Moment magnitude: 6.7

3) Formula for estimation

The surface soil amplification factor was evaluated as the function of shear-wave velocity based on the observed records by 1987 Chiba-ken-toho-oki Earthquake. The amplification of acceleration, velocity and acceleration response spectrum by the soil from ground surface to Tertiary layer are defined as follows;

Table 4.1.1 Coefficients