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CVM H GTL

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Philip Maechling edited this page Apr 25, 2022 · 17 revisions

CVM-H is a mult-resolution model, described this way in the USR paper (Shaw 2015).

The various components of the USR, including the topography, basin representations, basement and Moho surfaces, tomographic crust and upper mantle velocity models, and the GTL were as-sembled by parameterizing a set of voxets, or regular grids of voxels, with velocity values and by appropriately resampling sur-faces. These nested voxets include a high-resolution grid (250 by 250 m horizontally, 100 m in depth) centered around the Los Angles basin, where we had the greatest density of data. This voxet was embedded in a medium resolution grid (1 by 1km resolution) for the remainder of southern California. Areas beyond the extent of the voxets are extrapolated by a 1D ve-locity model (Dreger and Helmberger, 1990; Wald et al., 1995; Hutton et al., 2010). Below 15 km, the model resolution is 1 km vertically and 10 km horizontally.

CVM-H GTL

CVM-H is a cell-based velocity model with two different resultion areas. The LA Basin area is discretized at 250x250mx100m, and the background region is 1kmx1kmx500m resolution.

The are three CVM-H GTL modes, which include:

  1. Default - no GTL. The CVM-H model has limited areas with low (<500m/s) Vs values. This is the default mode.
[ucvm@66975967506b target]$ vs30_query -f /app/ucvm/conf/ucvm.conf -m cvmh < vs30pts.txt
 -118.4810    34.3120    165.039
 -118.5000    34.5000   1210.907
 -117.5000    33.5500   1424.097
 -117.5000    35.5000   1458.000
 -116.5000    34.4000   1407.656
  1. CVM-S4 GTL. Users can edit the UCVM.conf file and set a parameter (cvmh_param=USE_GTL,True). When this is set true, CVM-H will return different material properties for the top cell. The properties it returns are based on data extracted from the CVM-S4 model, which has more detailed GTL information.
[ucvm@66975967506b target]$ vi /app/ucvm/conf/ucvm.conf
[ucvm@66975967506b target]$ vs30_query -f /app/ucvm/conf/ucvm.conf -m cvmh < vs30pts.txt
 -118.4810    34.3120    174.363
 -118.5000    34.5000    404.900
 -117.5000    33.5500    318.913
 -117.5000    35.5000    201.797
 -116.5000    34.4000    232.947
  1. Ely/Jordan : Ely - Users can
  2. Ely/Jordan : Linear -

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. Introduction
  2. Overview and Installation
  3. Registered CVMs
    1. Model-Specific-Notes
  4. UCVM Configuration File
  5. Basic UCVM Commands
    1. Query by Elevation or Depth
    2. Ely/Jordan GTL
    3. Plotting Scripts
  6. List of Commands
    1. Manual Pages
    2. Executables
    3. Scripts
    4. Examples
  7. Tutorials
    1. ucvm_query
    2. makegrid.sh
    3. Make-Grid
    4. Adding GTL
    5. Basin-Query
    6. ucvm2mesh
    7. vs30_query
  8. UCVM-Docker
    1. Using-UCVM-Docker
  9. References
    1. UCVM Query Parameters
    2. Model Specific Query Behavior
    3. Model Specific GTLs
    4. System-specific Builds
    5. Model References
  10. Testing
    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
  11. Concepts
    1. GitHub Branches
    2. Vs30 Info
    3. UCVM Plotting
    4. C-API
    5. FORTRAN-API
    6. Projections
  12. Earlier Documentation
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