1.28 Morikawa et al. (2006)

1)      Reference

Nobuyuki Morikawa, Tatsuo Kanno, Akira Narita, Hiroyuki Fujiwara and Yoshimitsu Fukushima, 2006, New Additional Correction Terms for Attenuation Relations of Peak Amplitudes and Response Spectra Corresponding to the Anomalous Seismic Intensity in Northeastern Japan, Japan Association for Earthquake Engineering, vol. 6, No. 1 (in Japanese).

 

2)      Estimated physical parameter

- Peak ground acceleration

- Peak ground velocity

- Peak response spectrum (h=5%, T=0.05 to 4.5 sec)

 

3)      Used strong motion data

- Area: Pacific plate (in Japan, K-NET, KiK-net etc.)

- Type of earthquake: Interplate, Intraslab

- Period: 1996-2003 years

- Number of events: 35

- Number of records:

- Magnitude: Mw5.5-8.0

- Epicentral distance:

 

4)      Style of faulting

Not specified

 

5)      Ground condition

Not specified

 

6)      Definition of magnitude

Moment magnitude

 

7)      Definition of source distance

Shortest distance to the rupture zone

 

8)      Definition of horizontal components

Not specified

 

9)      Applicability written in the paper

Eastern side of longitude 138 degree east

 

10)  Empirical attenuation formula

P: peak ground acceleration(c/m2), peak ground velocity (c/m), or 5% damped

response spectral acceleration (c/m2)

G: site amplification ratio

       Anew, Sc: correction coefficient

 

Xvf: distance from observation point to volcanic front

                            : average of Xvf

 

   (D>30km)    (A1)[*]

pre: peak ground acceleration(c/m2), peak ground velocity (c/m), or 5% damped

response spectral acceleration (c/m2)

G: site amplification ratio

X: source distance

(A2) [*]

 
 
                         Mw: moment magnitude

          

                                 (A3) [*]                                 

                        

AVS30: average shear-wave velocity at 30m depth

                         n: number of strata layers down to depth 30m

                         Hi: thickness of the ith layer (m)

                         Vsi: shear-wave velocity of ith layer (m/s)

 

 

Table 1.28-1 Coefficients for attenuation formula

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


Table 1.28-2 Coefficients for equation (A1) and (A2) (Kanno et al., 2005)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


[*] Kanno et al. (2005) : Determination of an empirical attenuation relation reflecting average characteristics of strong

ground motion, Proc. International Symposium on Earthquake Engineering, Kobe, 2005 (submitted to Bull. Seism. Soc. Am)