1 / 11

Velocity Discontinuities in Statewide Models: Smoothing and LT Model Considerations

This presentation addresses the need for smoothing velocity discontinuities at the boundaries between different geological models in the UCVM framework. We explore whether to include the Lin-Thurber (LT) model and illustrate key issues using plots that depict velocity variations, particularly the notable near-surface discontinuity between CVM-SI and CVM-NCI models. We also examine unexpected velocities in the Northeast mountainous regions of California and discuss bilinear interpolation approximations used in the LT model. Further details are provided in accompanying plots.

deiondre
Télécharger la présentation

Velocity Discontinuities in Statewide Models: Smoothing and LT Model Considerations

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. CS Statewide Questions Do the velocity discontinuities at the boundaries between models need to be smoothed? If so, how? Include/exclude Lin-Thurber model? The following slides illustrate both of these issues.

  2. Illustration of Discontinuities as Models are Combined The following four plots illustrate how things look as models are tiled one on top of another in UCVM. There is a significant near-surface velocity discontinuity between CVM-SI and CVM-NCI

  3. Problems with LT Model Unexpected velocities (to me) in the NE mountainous region of California near Tahoe. UCVM uses bilinear interpolation approximation as a projection for LT model since the authors have not published the projection specification they used in their model grid. We will need to get their projection. The caption under the plot on the next slide gives more detail on both of these issues.

  4. Plot Illustrating LT Velocity Issue

  5. How Things Look w/o LT Model The following two plots show a combined statewide consisting of only the CVM-SI, CVM-NCI, and 1D models at depths 0m and 2000m The velocity discontinuities seem to improve with depth.

More Related