UCVM BBP1D Model Check
We are verifying the included Broadband 1D model within UCVM. The currently included version is intended to be an interpolated version of the LA Basin velocity model used in the June 2013 validation. This model has an added 1km moho transition.
Contents
What Is Included In UCVM
The following model is included within UCVM. This is the model that was used in the CyberShake run.
# Broadband Platform 1D Velocity Model Configuration # # Reads in a 1D model in the Broadband Platform format. # # Name of model. version=Los Angeles Basin Broadband Model with 1km Moho Transition # Number of layers. num_z=19 # Interpolation method. interpolation=linear # Start of model. --MODEL-- 0.0020 1.7000 0.4500 2.0000 45.0000 22.5000 0.0040 1.8000 0.6500 2.1000 65.0000 32.5000 0.0060 1.8000 0.8500 2.1000 85.0000 42.5000 0.0080 1.9000 0.9500 2.1000 95.0000 47.5000 0.0100 2.0000 1.1500 2.2000 115.0000 57.5000 0.0700 2.4000 1.2000 2.2000 120.0000 60.0000 0.2000 2.8000 1.4000 2.3000 140.0000 70.0000 0.2000 3.1000 1.6000 2.4000 160.0000 80.0000 0.2000 3.4000 1.8000 2.4500 180.0000 90.0000 0.3000 3.7000 2.1000 2.5000 210.0000 105.0000 2.0000 4.4000 2.4000 2.6000 240.0000 120.0000 2.0000 5.1000 2.8000 2.7000 280.0000 140.0000 1.0000 5.6000 3.1500 2.7500 315.0000 157.5000 5.0000 6.1500 3.6000 2.8250 360.0000 180.0000 5.0000 6.3200 3.6500 2.8500 365.0000 182.5000 5.0000 6.5500 3.7000 2.9000 370.0000 185.0000 9.0000 6.8000 3.8000 2.9500 380.0000 190.0000 1.0000 7.8000 4.5000 3.2000 450.0000 225.0000 999.0000 7.8000 4.5000 3.2000 450.0000 225.0000
Linearly Interpolated 1D Model Without The Moho Transition
This was the version originally proposed for the CyberShake 1D run. It is an interpolated version of the BBP 1D LA Basin model. This model was agreed upon, however there were concerns about there being a lack of a moho which was added into the final version that was used and included within UCVM.
# Broadband Platform 1D Velocity Model Configuration # # Reads in a 1D model in the Broadband Platform format. # # Name of model. version=Los Angeles Basin Broadband Model without 1km Moho Transition # Number of layers. num_z=19 # Interpolation method. interpolation=linear # Start of model. --MODEL-- 0.0020 1.7000 0.4500 2.0000 45.0000 22.5000 0.0040 1.8000 0.6500 2.1000 65.0000 32.5000 0.0060 1.8000 0.8500 2.1000 85.0000 42.5000 0.0080 1.9000 0.9500 2.1000 95.0000 47.5000 0.0100 2.0000 1.1500 2.2000 115.0000 57.5000 0.0700 2.4000 1.2000 2.2000 120.0000 60.0000 0.2000 2.8000 1.4000 2.3000 140.0000 70.0000 0.2000 3.1000 1.6000 2.4000 160.0000 80.0000 0.2000 3.4000 1.8000 2.4500 180.0000 90.0000 0.3000 3.7000 2.1000 2.5000 210.0000 105.0000 2.0000 4.4000 2.4000 2.6000 240.0000 120.0000 2.0000 5.1000 2.8000 2.7000 280.0000 140.0000 1.0000 5.6000 3.1500 2.7500 315.0000 157.5000 5.0000 6.1500 3.6000 2.8250 360.0000 180.0000 5.0000 6.3200 3.6500 2.8500 365.0000 182.5000 5.0000 6.5500 3.7000 2.9000 370.0000 185.0000 10.0000 6.8000 3.8000 2.9500 380.0000 190.0000 999.0000 7.8000 4.5000 3.2000 450.0000 225.0000
Original Staircase Model
The original LA Basin model is a staircase model (meaning no interpolation). Interpolation was favored for the 3D wave propagation simulation.
# Broadband Platform 1D Velocity Model Configuration # # Reads in a 1D model in the Broadband Platform format. # # Name of model. version=Los Angeles Basin Broadband Model without 1km Moho Transition No Interpolation # Number of layers. num_z=19 # Interpolation method. interpolation=none # Start of model. --MODEL-- 0.0020 1.7000 0.4500 2.0000 45.0000 22.5000 0.0040 1.8000 0.6500 2.1000 65.0000 32.5000 0.0060 1.8000 0.8500 2.1000 85.0000 42.5000 0.0080 1.9000 0.9500 2.1000 95.0000 47.5000 0.0100 2.0000 1.1500 2.2000 115.0000 57.5000 0.0700 2.4000 1.2000 2.2000 120.0000 60.0000 0.2000 2.8000 1.4000 2.3000 140.0000 70.0000 0.2000 3.1000 1.6000 2.4000 160.0000 80.0000 0.2000 3.4000 1.8000 2.4500 180.0000 90.0000 0.3000 3.7000 2.1000 2.5000 210.0000 105.0000 2.0000 4.4000 2.4000 2.6000 240.0000 120.0000 2.0000 5.1000 2.8000 2.7000 280.0000 140.0000 1.0000 5.6000 3.1500 2.7500 315.0000 157.5000 5.0000 6.1500 3.6000 2.8250 360.0000 180.0000 5.0000 6.3200 3.6500 2.8500 365.0000 182.5000 5.0000 6.5500 3.7000 2.9000 370.0000 185.0000 10.0000 6.8000 3.8000 2.9500 380.0000 190.0000 999.0000 7.8000 4.5000 3.2000 450.0000 225.0000
BBP 1D Model Unmodified
The model below is defined in Table 3 of this paper: Bulletin of the Seismological Society of America, Vol. 100, No. 5A, pp. 2095–2123, October 2010, doi: 10.1785/0120100057 Broadband Ground-Motion Simulation Using a Hybrid Approach by Robert W. Graves* and Arben Pitarka
Model Layer Thickness (km) P velocity (km/s) S velocity (km/s) Density (g/cm^3) QP QS
LA (Los Angeles Area)
1 0.002 1.7 0.45 2 45 22.5
2 0.004 1.8 0.65 2.1 65 32.5
3 0.006 1.8 0.85 2.1 85 42.5
4 0.008 1.9 0.95 2.1 95 47.5
5 0.01 2 1.15 2.2 115 57.5
6 0.07 2.4 1.2 2.2 120 60
7 0.2 2.8 1.4 2.3 140 70
8 0.2 3.1 1.6 2.4 160 80
9 0.2 3.4 1.8 2.45 180 90
10 0.3 3.7 2.1 2.5 210 105
11 2 4.4 2.4 2.6 240 120
12 2 5.1 2.8 2.7 280 140
13 1 5.6 3.15 2.75 315 157.5
14 5 6.15 3.6 2.825 360 180
15 5 6.32 3.65 2.85 365 182.5
16 5 6.55 3.7 2.9 370 185
17 10 6.8 3.8 2.95 380 190
18 999 7.8 4.5 3.2 450 225
