CVM Evaluation

SCEC's CVM evaluation system is designed to show differences between currently available California CVM's. Our CVM evaluations use wave propagation simulations of moderate magnitude historical earthquakes and goodness-of-fit measurements that compare simulation waveforms (or amplitudes) to observational data.

CVM evaluations involves the following:

1. CVM evaluations are run prior to release of new version of CVM-H, or other SCEC CVM's. Multiple CVM's are evaluated at one time, so that performance of a new CVM can be compared to existing, or prior, CVM versions.
2. A software distribution each CVM is posted online so that it is accessible to the SCEC Community
3. Each CVM is used to construct a velocity mesh for a 1Hz Chino Hills simulation. In the future, additional validation events may be used.
4. The system runs a 1Hz wave propagation simulation and compares simulation results to observed seismograms for the event
5. CVM Evaluation results, including velocity profiles, and waveform-based goodness of fit measures, are posted online for review.

Recent CVM Evaluations

CVM evaluations are typically run when new CVM's are released. In Feb, 2011, we released CVM-H v11.2, at which time, we ran CVM evaluations for three different SCEC CVM's including:

1. CVM-H
2. CVM-H v6.3capi
3. CVM-S

Evaluation results for CVM-H v11.2 and other SCEC CVM's are posted here:

• Most Recent CVM Evaluation Results

Example Goodness of Fit Measures

Our CVM Evaluation system uses several goodness of fit measures. As one example, here are frequency dependent, amplitude-based, bias plots used in the CVM evaluation process.

Fig 1: Chino Hills 1Hz GOF with CVM-4.

Fig 2: Chino Hills 1Hz GOF with CVM-6.2

Fig 3: Chino Hills 1Hz GOF with CVM6.2+GTL

Related Entries

• Harvard Structural Geology and Earth Resources Group Home Page
• Harvard CVM-H Web Page
• Goodness of Fit
• CVM-S
• CVM-H v6.3capi
• CVM Toolkit
• CVM Evaluation
• Community Velocity Model
• UCVM

See Also

• Main Page
• SCEC Home Page