Vertical CVM Profiles

We are preparing a series of vertical velocity model profiles plots to support the SCEC summer school activities.

CVM Request

1. Lat/Long of locations
   1. 34.829 , -116.335
   2. 33.998 , -117.680
   3. 34.093 , -117.316
   4. 35.305 , -188.488
2. Velocity models to create profiles for
   1. CVM S4.26 if possible
3. Step resolution in depth (meters between data points in depth)
   1. 200m depth resolution, mainly to capture the shallow layers and the main discontinuities.
4. Smooth plots by using interpolation between steps
   1. no
5. How deep the profiles should go.
   1. The surface until 40km.

CVM

There is a significant amount of confusion regarding the names of the SCEC CVMs. One of the issues is that the CVM names used by the scientists do not match the names used by the UCVM software.

The profiles below were extracted from a model registered into UCVM. In UCVM terms, the user queries this model using model name cvms5. For the profiles below, we configured UCVM cvms5 model with GTL off, and we queried the points at 200m steps. Since this is the tomography-based CVM, and the optional Vs30 derived GTL is off, we expect not Vs values below 900m/s at any site in the region.

Common Name: CVM-S4.26 Model Name: cvms5 UCVM Name: cvms5 Description: This is a CVM produced by Po Chen and En-Jui Lee. The starting model was a modified version of CVM-S4. One of their modifications was to put a min Vs of 1000 m/s floor into their starting model because their simulations were at low frequencies. They allowed the tomography to lower those min Vs, but the lowest values in this model are Min Vp: 1250.00, Min Vs: 825.00, Min Rho: 2000.00. This model is delivered on a coarse 3D grid of 1536 x 992 x 100 cells with a grid spacing of 500 m. UCVM returns values from this mesh using trilinear interpolation to provide intermediate values between mesh points. UCVM adds a Vs30-based GTL using the Ely method. You must turn off this GTL to access the actual tomography-derived model.

Results Table

Southern California Velocity Profiles

34.829 , -116.335	33.998 , -117.680	34.093 , -117.316	35.305 , -118.488
Google Maps Site 1	Google Maps Site 2	Google Maps Site 3	Google Maps Site 4
Vp	Vp	Vp	Vp
Vs	Vs	Vs	Vs
rho	rho	rho	rho
Txt Data	Txt Data	Txt Data	Txt Data

Related Entries

• UCVM
• SCEC-ERI_Workshop_2014