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Philip Maechling edited this page Apr 21, 2022 · 11 revisions

In UCVM, geotechnical layer (GTL) refers to the near-surface region of the velocity models. These regions have significant impact on ground motion simulations.

How to enable/disable GTL from models

Both CVM-S4 and CVM-S4.26.M01 have builtin GTL that can not be disabled. For other models with GTL, there are two different methods for enable and disable GTL depending on the models.

CVM-H

The default GTL setting for CVM-H is off and the flag can be found in installdir/conf/ucvm.conf file.

# CVM-H model flags. The model defaults are:
# No 1D background model
# No GTL added
#
cvmh_param=USE_1D_BKG,False
cvmh_param=USE_GTL,False
#

To enable GTL, update the last line to be,

cvmh_param=USE_GTL,True

CVM-S4.26, CCA06, CS17.3, CS17.3-H

The default GTL setting for CVM-S4.26, CCA06, CS17.3 and CS17.3-H are off. The GTL setting can be set in each model's config file located at installdir/model/cvms5/data/config, installdir/model/cca/data/config, installdir/model/cs173/data/config and installdir/model/cs173h/data/config

# GTL on or off?
gtl = off

To enable GTL, change the line to

gtl = on

UCVM can add the Ely Jordan GTL to velocity models using a command line parameters. The following three queries are for the same cvm-h points, without GTL, with elygtl:ely and elygtl:linear.

When addin the elygtl, a -z parameter is required to indicate the start and end values.

CVM-H, UCVM.conf CVM-H GTL,false

[ucvm@ac3e0e643150 target]$ ucvm_query -f /app/ucvm/conf/ucvm.conf -m cvmh < querypts.txt
Using Geo Depth coordinates as default mode.
 -118.4810    34.3120    100.000    386.051    397.973       cvmh   1946.508    505.610   1880.905       none      0.000      0.000      0.000      crust   1946.508    505.610   1880.905
 -118.5000    34.5000    100.000    573.044    527.718       cvmh   3994.835   2271.410   2392.620       none      0.000      0.000      0.000      crust   3994.835   2271.410   2392.620
 -117.5000    33.5500    100.000    381.905    518.900       cvmh   5087.308   2795.410   2548.363       none      0.000      0.000      0.000      crust   5087.308   2795.410   2548.363
 -117.5000    35.5000    100.000    721.905    394.017       cvmh   4855.963   2866.868   2513.006       none      0.000      0.000      0.000      crust   4855.963   2866.868   2513.006
 -116.5000    34.4000    100.000    791.036    293.500       cvmh   4730.289   2751.258   2494.663       none      0.000      0.000      0.000      crust   4730.289   2751.258   2494.663

CVM-H UCVM.conf CVM-H GTL,false, elygtl:ely -z 0,350

[ucvm@ac3e0e643150 target]$ ucvm_query -f /app/ucvm/conf/ucvm.conf -m cvmh,elygtl:ely -z 0,350 < querypts.txt
Using Geo Depth coordinates as default mode.
 -118.4810    34.3120    100.000    386.051    397.973       cvmh   2139.914    672.340   1965.082     elygtl      0.000    397.973      0.000        ely   2226.984    600.934   1999.243
 -118.5000    34.5000    100.000    573.044    527.718       cvmh   4398.315   2524.129   2448.169     elygtl      0.000    527.718      0.000        ely   3334.547   1485.425   2289.937
 -117.5000    33.5500    100.000    381.905    518.900       cvmh   5074.826   2788.256   2546.395     elygtl      0.000    518.900      0.000        ely   3609.738   1589.793   2335.911
 -117.5000    35.5000    100.000    721.905    394.017       cvmh   4860.199   2866.500   2513.634     elygtl      0.000    394.017      0.000        ely   3369.378   1523.207   2296.108
 -116.5000    34.4000    100.000    791.036    293.500       cvmh   4713.636   2738.400   2492.270     elygtl      0.000    293.500      0.000        ely   3177.536   1389.021   2260.583

CVM-H UCVM.conf CVM-H GTL,false, elygtl:linear -z 0,350

[ucvm@ac3e0e643150 target]$ ucvm_query -f /app/ucvm/conf/ucvm.conf -m cvmh,elygtl:linear -z 0,350 < querypts.txt
Using Geo Depth coordinates as default mode.
 -118.4810    34.3120    100.000    386.051    397.973       cvmh   2139.914    672.340   1965.082     elygtl      0.000    397.973      0.000     linear      0.000      0.000      0.000
 -118.5000    34.5000    100.000    573.044    527.718       cvmh   4398.315   2524.129   2448.169     elygtl      0.000    527.718      0.000     linear      0.000      0.000      0.000
 -117.5000    33.5500    100.000    381.905    518.900       cvmh   5074.826   2788.256   2546.395     elygtl      0.000    518.900      0.000     linear      0.000      0.000      0.000
 -117.5000    35.5000    100.000    721.905    394.017       cvmh   4860.199   2866.500   2513.634     elygtl      0.000    394.017      0.000     linear      0.000      0.000      0.000
 -116.5000    34.4000    100.000    791.036    293.500       cvmh   4713.636   2738.400   2492.270     elygtl      0.000    293.500      0.000     linear      0.000      0.000      0.000

CVM-H, UCVM.conf CVM-H GTL,true

[ucvm@ac3e0e643150 target]$ ucvm_query -f /app/ucvm/conf/ucvm.conf -m cvmh < querypts.txt
Using Geo Depth coordinates as default mode.
 -118.4810    34.3120    100.000    386.051    397.973       cvmh   2164.931    561.880   1975.122       none      0.000      0.000      0.000      crust   2164.931    561.880   1975.122
 -118.5000    34.5000    100.000    573.044    527.718       cvmh   3571.999   1661.088   2329.946       none      0.000      0.000      0.000      crust   3571.999   1661.088   2329.946
 -117.5000    33.5500    100.000    381.905    518.900       cvmh   3633.909   1606.619   2339.684       none      0.000      0.000      0.000      crust   3633.909   1606.619   2339.684
 -117.5000    35.5000    100.000    721.905    394.017       cvmh   3221.180   1432.285   2269.012       none      0.000      0.000      0.000      crust   3221.180   1432.285   2269.012
 -116.5000    34.4000    100.000    791.036    293.500       cvmh   3256.877   1437.267   2275.747       none      0.000      0.000      0.000      crust   3256.877   1437.267   2275.747

CVM-H UCVM.conf CVM-H GTL,true elygtl:ely -z 0,350

[ucvm@ac3e0e643150 target]$ ucvm_query -f /app/ucvm/conf/ucvm.conf -m cvmh,elygtl:ely -z 0,350 < querypts.txt
Using Geo Depth coordinates as default mode.
 -118.4810    34.3120    100.000    386.051    397.973       cvmh   2139.914    672.340   1965.082     elygtl      0.000    397.973      0.000        ely   2226.984    600.934   1999.243
 -118.5000    34.5000    100.000    573.044    527.718       cvmh   4398.315   2524.129   2448.169     elygtl      0.000    527.718      0.000        ely   3334.547   1485.425   2289.937
 -117.5000    33.5500    100.000    381.905    518.900       cvmh   5074.826   2788.256   2546.395     elygtl      0.000    518.900      0.000        ely   3609.738   1589.793   2335.911
 -117.5000    35.5000    100.000    721.905    394.017       cvmh   4860.199   2866.500   2513.634     elygtl      0.000    394.017      0.000        ely   3369.378   1523.207   2296.108
 -116.5000    34.4000    100.000    791.036    293.500       cvmh   4713.636   2738.400   2492.270     elygtl      0.000    293.500      0.000        ely   3177.536   1389.021   2260.583

CVM-H UCVM.conf CVM-H GTL,true elygtl:linear -z 0,350

[ucvm@ac3e0e643150 target]$ ucvm_query -f /app/ucvm/conf/ucvm.conf -m cvmh,elygtl:linear -z 0,350 < querypts.txt
Using Geo Depth coordinates as default mode.
 -118.4810    34.3120    100.000    386.051    397.973       cvmh   2139.914    672.340   1965.082     elygtl      0.000    397.973      0.000     linear      0.000      0.000      0.000
 -118.5000    34.5000    100.000    573.044    527.718       cvmh   4398.315   2524.129   2448.169     elygtl      0.000    527.718      0.000     linear      0.000      0.000      0.000
 -117.5000    33.5500    100.000    381.905    518.900       cvmh   5074.826   2788.256   2546.395     elygtl      0.000    518.900      0.000     linear      0.000      0.000      0.000
 -117.5000    35.5000    100.000    721.905    394.017       cvmh   4860.199   2866.500   2513.634     elygtl      0.000    394.017      0.000     linear      0.000      0.000      0.000
 -116.5000    34.4000    100.000    791.036    293.500       cvmh   4713.636   2738.400   2492.270     elygtl      0.000    293.500      0.000     linear      0.000      0.000      0.000

Examples Effect of Ely/Jordan GTL in vs30queries

[ucvm@28d7188735e6 target]$ vs30_query -f /app/ucvm/conf/ucvm.conf -m cvms5 < vs30pts.txt
 -118.4810    34.3120    479.035
 -118.5000    34.5000    542.880
 -117.5000    33.5500   1488.633
 -117.5000    35.5000   1301.073
 -116.5000    34.4000   1297.697
[ucvm@28d7188735e6 target]$ vs30_query -f /app/ucvm/conf/ucvm.conf -m cvms5,elygtl:ely -z 0,350 < vs30pts.txt
 -118.4810    34.3120    209.404
 -118.5000    34.5000    276.783
 -117.5000    33.5500    313.116
 -117.5000    35.5000    246.636
 -116.5000    34.4000    200.306
[ucvm@28d7188735e6 target]$ vs30_query -f /app/ucvm/conf/ucvm.conf -m cvms5,elygtl:linear -z 0,350 < vs30pts.txt
 -118.4810    34.3120      0.000
 -118.5000    34.5000      0.000
 -117.5000    33.5500      0.000
 -117.5000    35.5000      0.000
 -116.5000    34.4000      0.000

Shield: CC BY 4.0

This work is licensed under a Creative Commons Attribution 4.0 International License.

CC BY 4.0

UCVM Documentation

  1. Overview and Introduction
  2. Installation
  3. Registered CVMs
    1. Model-Specific-Notes
  4. UCVM Configuration File
  5. Setting the UCVM Environment
  6. Basic UCVM Commands
    1. Query by Elevation or Depth
    2. Ely/Jordan GTL
    3. Plotting Scripts
  7. List of Commands
    1. Manual Pages
    2. Executables
    3. Scripts
    4. Examples
  8. Tutorials
    1. ucvm_query
    2. makegrid.sh
    3. Make-Grid
    4. Adding GTL
    5. Basin-Query
    6. ucvm2mesh
    7. vs30_query
  9. UCVM-Docker
    1. Using-UCVM-Docker
  10. References
  11. UCVM Query Parameters
  12. Model Specific Query Behavior
  13. Model Specific GTLs
  14. System-specific Builds
  15. Model References
  16. Concepts
    1. GitHub Branches
    2. Vs30 Info
    3. UCVM Plotting
    4. C-API
    5. FORTRAN-API
    6. Projections
  17. Test Cases
    1. GTL-Testing
      1. CVM-H GTLs
      2. CVM-S5 GTLs
      3. CVM-S4 GTLs
      4. CVMSI GTLs
      5. CCA GTLs
      6. 1D GTLs
      7. BBP1D GTLs
    2. Other CVM-H-Tests
  18. Earlier Documentation

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