1.15 Nishimura&Horike(2003), Horike&Nishimura(2004)

1) Reference

Toshimitsu Nishimura and Masanori Horike, 2003, The Attenuation Relationships of Peak Ground Accelerations for the Horizontal and the Vertical Components Inferred from Kyoshin Network Data, Journal of Struct. Construct. Eng. (Transactions of AIJ), No. 571, 63-70 (in Japanese).

Masanori Horike and Toshimitsu Nishimura, 2004, Attenuation Relationships of Peak Ground Velocity Inferred from the Kyoshin Network Data, Journal of Struct. Construct. Eng. (Transactions of AIJ), No. 575, 73-79 (in Japanese).

2) Estimated physical parameter

- Peak ground acceleration (Horizontal, Vertical)

- Peak ground velocity (Horizontal, Vertical)

3) Used strong motion data

- Area: Japan (K-NET)

- Type of earthquake:

- Period: 1996 – 2002 years

- Number of events: 53

- Number of records:

- Magnitude: 5.4 – 7.3

- Epicentral: 10 – 200 km (shallow earthquakes), 300 km (deep earthquakes)

4) Style of faulting

They concluded that the style of faulting don’t affect to the attenuation characteristics.

5) Ground condition

- Ground Class 1: (AVS20=0m/sec～250m/sec)

- Ground Class 2: (AVS20=250m/sec～400m/sec)

- Ground Class 3: (AVS20=400m/sec～700m/sec)

- Ground Class 4: (AVS20=700m/sec～)

AVS20: average S-wave velocity from surface to a depth of 20m

6) Definition of magnitude

JMA magnitude

7) Definition of source distance

hypocentral distance

8) Definition of horizontal component

average of two horizontal components

9) Applicability written in the paper

- hypocentral distances 10 km £ r £ 300 km

- depth D £ 100 km

- magnitude range 5.5 £ M_jma £ 7.3

only applicable to shallow earthquakes for the magnitude range 6.5 £ M_jma £ 7.3

10) Empirical attenuation formula