1.13 Si and Midorikawa (1999)

1) Reference

Hongjun Si and Saburoh Midorikawa, 1999, Attenuation Relations for Peak Ground Acceleration and Velocity Considering Effects of Fault Type and Site Condition, Journal of Struct. Construct. Eng. (Transactions of AIJ), No. 523, 63-70 (in Japanese).

Hongjun Si and Saburoh Midorikawa, 2000, New Attenuation Relations for Peak Ground Acceleration and Velocity Considering Effects of Fault Type and Site Condition, Proceedings of 12th World Conference on Earthquake Engineering, CD-ROM.

2) Estimated physical parameter

- Peak ground acceleration (Horizontal)

- Peak ground velocity (Horizontal)

3) Used strong motion data

- Area: Japan

- Type of earthquake:

- Period: 1968 – 1997 years

- Number of events: 21

- Number of records: 1137 records (PGA), 543 records (PGV)

- Magnitude: 5.8 – 8.2

- Epicentral distance: 0.0 – 118 km

4) Style of faulting

(a) Crustal

(b) Inter-plate

(c) Intra-plate

5) Ground condition

PGA: soil ground

PGV: stiff ground, AVS30=600m/sec

AVS30: average shear velocity from surface to a depth of 30m

6) Definition of magnitude

Moment magnitude

7) Definition of source distance

- Closest distance to the fault plane

- Equivalent hypocentral distance

8) Definition of horizontal component

Larger of the two horizontal components

9) Applicability written in the paper

Not specified

10) Empirical attenuation formula

Table 1.13.1 Coefficients for closest distance to the fault plane

a	h	d			e
		Crustal	Inter-plate	Intra-plate
Peak ground acceleration
0.50	0.0043	0.00	0.01	0.22	0.61
Peak ground velocity
0.58	0.0038	0.00	-0.02	0.12	-1.29

Table 1.13.2 Coefficients for equivalent hypocentral distance

a	h	d			e
		Crustal	Inter-plate	Intra-plate
Peak ground acceleration
0.50	0.0036	0.00	0.09	0.28	0.60
Peak ground velocity
0.58	0.0031	0.00	0.06	0.16	-1.25

Table 1.13.3 Standard error

Standard error	Equivalent hypocentral distance		Fault distance
	P.G.A.	P.G.V.	P.G.A.	P.G.V.
All data	0.28	0.23	0.27	0.23
D £100km	0.24	0.22	0.25	0.23
D=distance