Table 2. Attenuation Relationships
|
Source |
Attenuation Relationship |
Frequencies |
Weight |
|
Megathrust and
Transition Fault |
Youngs et al. (1997) (Interface) |
pga, 1, 3.33, 5 Hz |
100% |
|
Crustal faults, shallow
earthquakes |
Boore et al (1997) NEHRP B/C Sadigh et al. (1997) rock Campbell and Bozorgnia (1994) soft-rock |
pga |
33 1/3 % each |
|
|
Boore et al. (1997) Sadigh et al. (1997) |
1 , 3.33, 5 Hz |
50 % each |
|
Deep earthquakes
(depth= 50-80 km) |
Youngs et al. (1997) (Intraslab; depth fixed at 60 km) |
pga, 1, 3.33, 5 Hz |
100% |
|
Deeper earthquakes
(depth= 80-120 km) |
Youngs et al. (1997) (Intraslab; depth fixed at 90 km) |
pga, 1, 3.33, 5 Hz |
100% |
|
|