Table 1. Estimated year of completeness for the interface subduction zone for several magnitude bins. We noticed that for all magnitude, the year of completeness is the same when employing the clustered and the declustered catalogs.
M
|
Year
|
5-5.5
|
1980
|
5.5-6
|
1975
|
6.0-6.5
|
1964
|
6.5-7
|
1867
|
7-7.5
|
1776
|
7.5-7.83
|
1765
|
Table 2. Weibull and Poisson cumulative probability distribution parameters (Eqs 1 and 2). Weibull Conditional probabilities f(M)t, Δt of occurrence for the year 2070 (Eq. 3). σ denotes the standard deviation. λ is expressed above as the number for earthquakes per year; however, for the Poisson cumulative probability calculations, the number of earthquakes per day must be used in Eq. 2.
|
Weibull
Clustered catalog
|
Poisson
Clustered catalog
|
Poisson
Declustered catalog
|
Magnitude
|
α
|
β
|
RMS
|
Mean μ
years
|
σ
years
|
f(M)t, Δt and last year of occurrence
|
λ
|
RMS
|
λ
|
RMS
|
5-5.5
|
0.167
|
0.714
|
0.012
|
0.042
|
0.060
|
1.0000 - 2019
|
0.065
|
0.049
|
0.015
|
0.030
|
5.5-6
|
0.045
|
0.690
|
0.022
|
0.314
|
0.467
|
1.0000-2019
|
0.010
|
0.073
|
0.005
|
0.035
|
6-6.5
|
0.007
|
0.774
|
0.051
|
2.123
|
2.774
|
1.0000-2018
|
0.001
|
0.081
|
0.001
|
0.056
|
6.5-7
|
0.002
|
0.779
|
0.060
|
8.939
|
11.602
|
0.9878-2017
|
0.0003
|
0.073
|
0.0003
|
0.062
|
7-8
|
0.0008
|
0.835
|
0.038
|
14.412
|
17.354
|
0.9681-2012
|
0.0002
|
0.053
|
0.0002
|
0.044
|
Table 3. Uncertainties used for the free-zone methods in terms epicentral location (up) and magnitude (low). The magnitudes uncertainties from 1975 to 2019 depends on the original magnitude scale from which a moment magnitude Mw was converted (based on Salazar et al., 2013).
Years
|
Uncertainties
|
1609-1899
|
30 km
|
1900-1963
|
20 km
|
1964-1975
|
10 km
|
1975-2019
|
5 km
|
Years
|
Uncertainties
|
1609-1899
|
0.5
all magnitude scales
|
1900-1974
|
0.25
all magnitude scales
|
1975-2019
|
0.10 (Mw)
0.15 (MS)
0.24 (mb)
0.20 (MD)
|
Table 4. Comparison of peak ground acceleration (zero period) and spectral ordinates in g for 0.2 and 1.0 s for 5% damping setting 2 and 10% probability of exceedance in 100 years lifetime amongst different seismic hazard models in San Salvador City.
|
10 % probability of exceedance
|
2 % probability of exceedance
|
|
Time-independent
|
Time-dependent
|
Time- independent
|
Time-dependent
|
Period (s)
|
Rigid- zone
|
Free- Zone
|
Rigid- zone
|
Free-Zone
|
Rigid- zone
|
Free- Zone
|
Rigid- zone
|
Free- Zone
|
0.0
|
0.443
|
0.423
|
0.464
|
0.408
|
0.642
|
0.647
|
0.695
|
0.637
|
0.2
|
0.843
|
0.832
|
0.998
|
0.887
|
1.237
|
1.311
|
1.500
|
1.391
|
1.0
|
0.240
|
0.248
|
0.352
|
0.315
|
0.366
|
0.391
|
0.526
|
0.492
|