Lin Thurber CVM

The Lin Thurber et al (2010) CVM is seismic velocity models of the California crust and uppermost mantle using a regional-scale double-difference tomography algorithm. The details are described in:

• Lin, G., C. H. Thurber, H. Zhang, E. Hauksson, P. Shearer, F. Waldhauser, T. M. Brocher, and J. Hardebeck (2010), A California statewide three-dimensional seismic velocity model from both absolute and differential Times, Bull. Seism. Soc. Am., 100, in press.

Fig 1: Lin Thurber CVM Vp Map at 1km Depth

Fig 3: Lin Thurber CVM Vs Maps at 1km Depth

These preliminary maps are based on querying the model at an elevation offset of -1000.0m from MSL. We will need to add a DEM to UCVM in order to properly query this model by depth. The model is referenced using inverse bilinear interpolation of the original model boundaries.

As seen in the plots, the Vp model is higher resolution (~10km) than the Vs Model (~30km).

Original Model Format

Recently, we determined the seismic velocity model of the California crust and uppermost mantle using a regional-scale double-difference tomography algorithm. Our model is the first 3D seismic velocity model for the entire state of California based on local and regional arrival time data that has ever been developed. It has improved areal coverage compared to the previous northern and southern California models, and extends to greater depth due to the inclusion of substantial data at large epicentral distances.

• Lin Web Page With Original Model. We have configured a program so that this Lin model can be queried through the UCVM API. the original model format is a table of data values in the following format.

FILE  FORMAT DESCRIPTION
-117.7230    37.8242     1.00     250.00       0.00     5.0390     109.13
lon    lat  dep   x   y   vp   DWS (derivative weight sum)