Table 4. List of the variables used for calculating Fourier amplitude spectra.

R _θϕ

Radiation coefficient for an S-wave

0.63

—

Boore (1983)

FS

Amplification due to a free surface

1

—

Boore (1983)

PRITIN

Factor for partitioning energy into two horizontal components

0.707

—

Boore (1983)

ρ

Density below the bedrock

2.7

g/cm³

ρ

S-wave velocity below the bedrock

3.46

km/s

m ₀

Seismic moment for a virtual middle-size earthquake

—

Nm

f

Frequency

—

Hz

f _c

Corner frequency

—

Hz

f _m

Cutoff frequency

6.0

Hz

Satoh (2002)

s

Decay rate at high frequencies

2.1

Satoh et al. (1994)

X

Source distance

—

km

Q

Path attenuation

204 f 0.65

—

Kawase and Matsuo (2004)

n

Geometrical attenuation factor

1.0(X<100) 0.95(100X<120)

—

Kawase and Matsuo (2004)