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CVM H GTL
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 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:
- 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
- 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
- Ely/Jordan : Ely - Users can
- Ely/Jordan : Linear -