1.5
Youngs et al. (1997)
1) Reference
R. R. Youngs, S. -J. Chiou, W. J. Silva and J. R. Humphrey, 1997, Strong Ground Motion Attenuation Relationships for Subduction Zone Earthquakes, Seismological Research Letters, Vol. 68, No. 1, 58-73.
2) Estimated
physical parameter
- Peak ground acceleration (Horizontal)
- Acceleration response spectra (h=5%, T=0.075 to 3 sec) (Horizontal)
3) Used
strong motion data
- Area:
- Type of earthquake: interface and intraslab
- Period: 1940 – 1992 years
- Number of events: 19
- Number of records: 271
- Magnitude: 5.0 – 8.2
- Epicentral distance: 8.5 – 550 km
4) Style
of faulting
(a) Interface
(b) Intraslab
5) Ground
condition
(a) Rock
(b) Shallow Soil
(c) Deep Soil
6) Definition
of magnitude
Moment magnitude
7) Definition
of source distance
Closest distance to the rupture surface
8) Definition
of horizontal component
Geometric mean of two perpendicular horizontal components
9) Applicability
written in the paper
The attenuation relationships are appropriate for earthquakes of magnitude 5 and greater and for distances of 10 to 500 km.
10) Empirical
attenuation formula
Table
1.5.1 Attenuation relation for horizontal response spectral acceleration (For
Rock)
|
Period(s) |
C1 |
C2 |
C3 |
C4* |
C5* |
|
PGA |
0.0 |
0.0 |
-2.552 |
1.45 |
-0.1 |
|
0.075 |
1.275 |
0.0 |
-2.707 |
1.45 |
-0.1 |
|
0.1 |
1.188 |
-0.0011 |
-2.655 |
1.45 |
-0.1 |
|
0.2 |
0.722 |
-0.0027 |
-2.528 |
1.45 |
-0.1 |
|
0.3 |
0.246 |
-0.0036 |
-2.454 |
1.45 |
-0.1 |
|
0.4 |
-0.115 |
-0.0043 |
-2.401 |
1.45 |
-0.1 |
|
0.5 |
-0.400 |
-0.0048 |
-2.360 |
1.45 |
-0.1 |
|
0.75 |
-1.149 |
-0.0057 |
-2.286 |
1.45 |
-0.1 |
|
1.0 |
-1.736 |
-0.0064 |
-2.234 |
1.45 |
-0.1 |
|
1.5 |
-2.634 |
-0.0073 |
-2.160 |
1.50 |
-0.1 |
|
2.0 |
-3.328 |
-0.0080 |
-2.107 |
1.55 |
-0.1 |
|
3.0 |
-4.511 |
-0.0089 |
-2.033 |
1.65 |
-0.1 |
Table
1.5.2 Attenuation relation for horizontal response spectral acceleration (For Soil)
|
Period(s) |
C1 |
C2 |
C3 |
C4* |
C5* |
|
PGA |
0.0 |
0.0 |
-2.329 |
1.45 |
-0.1 |
|
0.075 |
2.400 |
-0.0019 |
-2.697 |
1.45 |
-0.1 |
|
0.1 |
2.516 |
-0.0019 |
-2.697 |
1.45 |
-0.1 |
|
0.2 |
1.549 |
-0.0019 |
-2.464 |
1.45 |
-0.1 |
|
0.3 |
0.793 |
-0.0020 |
-2.327 |
1.45 |
-0.1 |
|
0.4 |
0.144 |
-0.0020 |
-2.230 |
1.45 |
-0.1 |
|
0.5 |
-0.438 |
-0.0035 |
-2.140 |
1.45 |
-0.1 |
|
0.75 |
-1.704 |
-0.0048 |
-1.952 |
1.45 |
-0.1 |
|
1.0 |
-2.870 |
-0.0066 |
-1.785 |
1.45 |
-0.1 |
|
1.5 |
-5.101 |
-0.0114 |
-1.470 |
1.50 |
-0.1 |
|
2.0 |
-6.433 |
-0.0164 |
-1.290 |
1.55 |
-0.1 |
|
3.0 |
-6.672 |
-0.0221 |
-1.347 |
1.65 |
-0.1 |
|
4.0 |
-7.618 |
-0.0235 |
-1.272 |
1.65 |
-0.1 |