1.29 Uchiyama & Midorikawa (2006)

1) Reference

Yasuo Uchiyama & Saburoh Midorikawa, 2006, Attenuation Relationship for Response Spectra on Engineering Bedrock Considering Effect of focal Depth, J. Struct. Constr. Eng., AIJ, No. 606, 81-88 (in Japanese).

2) Estimated physical parameter

- Acceleration response spectrum on engineering bedrock (h=5%, T=0.02 to 5.0 sec)

3) Used strong motion data

- Area: Japan and around

- Type of earthquake:

- Period: 1968-2003 years

- Number of events: 52

- Number of records: 3198

- Magnitude: M_w5.5-8.3

- Epicentral distance:

4) Style of faulting

(a) Crustal

(b) Interplate

(c) Intraplate

5) Ground condition

Engineering bedrock: V_s-30 is about 500 m/s

6) Definition of magnitude

Moment magnitude

7) Definition of source distance

Shortest distance to the rupture zone

8) Definition of horizontal components

Geometric mean of two horizontal components

9) Applicability written in the paper

Engineering bedrock: V_s-30 is about 500 m/s

Table 1.29-1 Site classification based on V_s-30

10) Empirical attenuation formula

SA(T): 5% damped acceleration response spectra (the geometric mean of two horizontal

components) on engineering bedrock

M_w: moment magnitude

X: fault distance

D: focal depth

σ(T): standard deviation

g =

Figure 1.29-1 Regression coefficients for attenuation formula