UCVM muscal
This page describes the Multi-Scale CALifornia (MUSCAL) velocity model and its integration into UCVM.
Contents
MUSCAL overview
The MUSCAL Vp and Vs model was created by Te-Yang Yeh and Yehuda Ben-Zion in 2025-6 by starting with the CANVAS tomography model as a base and then integrating multiple regional and local high-resolution models. Each submodel is evaluated to determine where it improves the fit through simulations of M4 historical events to 1 Hz, and then the overall model is updated where the submodel improves the fit.
Datasets
zone: 11
command use:
plot_depth_profile.py -n $UCVM_INSTALL_PATH/conf/ucvm.conf -i $UCVM_INSTALL_PATH -d vs -c muscal
-o muscal_small_depth_1000.png -C 'Multi-Scale Statewide California Velocity Model'
-v 1000 -b 0 -s 36.5054,-119.0587 -e 30000
big data in netcdf
model_MSCAL_CANVAS_dll0.01_dz50_cmpd.nc 4.5G
longitdue:1301 from -126 to -113
latitude:1251 from 31 to 43.5
depth:671 from 0 to 100,000
50 increments until 30,000
1000 increments til 100000
Plot Depth profile at 36.5054,-119.0587 in different step increments. No interpretation and access data using nc api
File:Muscal big depth-50 matprops.json.txt File:Muscal big depth-100 matprops.json.txt File:Muscal big depth-500 matprops.json.txt File:Muscal big depth-1000 matprops.json.txt
small data in netcdf
model_MUSCAL_CANVAS_dll0.01_vardz_cmpd.nc 2.1G
longitdue:1301 from -126 to -113
latitude:1251 from 31 to 43.5
depth:210 from 0 to 99,000
50 increments upto 3000
100 increments upto 5000
250 increments upto 10000
500 increments upto 30000
1000 increments upto 99000
Depth profiles in different steps : 50m,100m,500m,1000m
Direct from netcdf as external file
File:Muscal small depth-50 matprops.json.txt File:Muscal small depth-100 matprops.json.txt File:Muscal small depth-500 matprops.json.txt File:Muscal small depth-1000 matprops.json.txt
Loaded in-memory as binary data no interpolation
File:Muscal small no interp-50 matprops.json.txt File:Muscal small no interp-100 matprops.json.txt File:Muscal small no interp-500 matprops.json.txt File:Muscal small no interp-1000 matprops.json.txt
Another small dataset in netcdf
model_MUSCAL_CANVAS_dll0.01_vardz_float32_cmpd.nc 1.4G
All longitude, latitude, and depth points are now saved as float32, as well as the vp, vs, and rho.
Loaded in-memory as binary data with interpolation
File:Muscal small interp-50 matprops.json.txt File:Muscal small interp-100 matprops.json.txt File:Muscal small interp-500 matprops.json.txt File:Muscal small interp-1000 matprops.json.txt
Validation
Several steps of pre/post processing are done to original MUSCAL model(netcdf format) in order to incorporate it into UCVM and CVM explorer.
Because of the speed of netcdf-C code is too slow to support in-time nature of the explorer and would like to have interpolation on query,
* Number of depth layer is reduced with deeper layers merged into fewer layers
* preprocessing the netcdf data into binary data files
* data are all in float32
File:MUSCAL test points deep.txt File:MUSCAL test points shallow.txt
Final result from ucvm_query, (with interpolation)
File:MUSCAL test points deep.final.txt File:MUSCAL test points shallow.final.txt
