|
ATTENUATION RELATION AND COEFFICIENTS OF MOVEMENT IN IRAN
M. Zare (International Institute of Earthquake Engineering and Seismology)
Table 1: The coefficient for
the attenuation of PGA,
|
Region/comp.
|
a
|
b
|
c1
|
c2
|
c3
|
c4
|
Sigma
|
|
Central Iran, Alborz (Vert.) |
0.322
|
-0.0003
|
-0.828
|
-0.754
|
-0.971
|
-0.788
|
0.352
|
|
Central Iran, Alborz (Hori.) |
0.322
|
-0.0004
|
-0.688
|
-0.458
|
-0.720
|
-0.585
|
0.394
|
|
Zagros (Vertical comp.) |
0.406
|
-0.0038
|
-1.262
|
-1.333
|
-1.230
|
-1.777
|
0.356
|
|
Zagros (Horizontal comp.) |
0.399
|
-0.0019
|
-1.047
|
-1.065
|
-1.020
|
-0.975
|
0.329
|
|
Iranian data (Vertical) |
0.362
|
-0.0002
|
-1.124
|
-1.150
|
-1.139
|
-1.064
|
0.336
|
|
Iranian data (Horizontal) |
0.360
|
-0.0003
|
-0.916
|
-0.852
|
-0.900
|
-0.859
|
0.333
|
Table 2: The coefficient for
the attenuation of PGV,
|
Region/comp.
|
a
|
b
|
c1
|
c2
|
c3
|
c4
|
Sigma
|
|
Central Iran, Alborz (Vert.) |
0.466
|
0.0014
|
-3.108
|
-3.178
|
-3.328
|
-3.069
|
00.363
|
|
Central Iran, Alborz (Hori.) |
0.471
|
0.0006
|
-2.865
|
-2.896
|
-2.969
|
-2.737
|
0.360
|
|
Zagros (Vertical comp.) |
0.612
|
0.0028
|
-4.011
|
-4.101
|
-3.984
|
-3.917
|
0.319
|
|
Zagros (Horizontal comp.) |
0.588
|
0.0040
|
-3.627
|
-3.651
|
-3.632
|
-3.502
|
0.315
|
|
Iranian data (Vertical) |
0.548
|
0.0018
|
-3.675
|
-3.761
|
-3.702
|
-3.610
|
0.336
|
|
Iranian data (Horizontal) |
0.538
|
0.0014
|
-3.335
|
-3.360
|
-3.348
|
-3.224
|
0.338
|
Table 3: The coefficient for
the attenuation of PGD,
|
Region/comp.
|
a
|
b
|
c1
|
c2
|
c3
|
c4
|
Sigma
|
|
Central Iran, Alborz (Vert.) |
0.828
|
-0.0029
|
-5.861
|
-6.127
|
-6.023
|
-5.753
|
0.521
|
|
Central Iran, Alborz (Hori.) |
0.828
|
-0.0036
|
-5.694
|
-5.837
|
-5.771
|
-5.352
|
0.489
|
|
Zagros (Vertical comp.) |
0.784
|
0.0084
|
-6.043
|
-6.164
|
-6.144
|
-6.109
|
0.312
|
|
Zagros (Horizontal comp.) |
0.797
|
0.0086
|
-5.893
|
-5.973
|
-5.954
|
-5.743
|
0.334
|
|
Iranian data (Vertical) |
0.830
|
-0.0003
|
-6.051
|
-6.213
|
-6.163
|
-6.081
|
0.337
|
|
Iranian data (Horizontal) |
0.829
|
-0.0010
|
-6.831
|
-5.942
|
-5.899
|
-5.645
|
0.388
|
Log A= aM+bX-logX + CiSi (σ)p
Where in this equation;
M : Magnitude
X : Hypocentral Distance
Ci : Site Class (C1:Rock, C2 Hard alluvium, C3: Soft alluvium, C4: Soft Soil)
Si : 0.1
P : 0.1 |
