Difference between revisions of "UCVM Verification"

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Prior to release of UCVM in docker version, we are re-verifying the codebase to show that it can reproduce results from previously published papers.
 
Prior to release of UCVM in docker version, we are re-verifying the codebase to show that it can reproduce results from previously published papers.
  
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== Eymold Jordan JGR ==
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* Eymold, W. K., & Jordan, T. H. ( 2019). Tectonic regionalization of the Southern California crust from tomographic cluster analysis. Journal of Geophysical Research: Solid Earth, 124, 11840– 11865. https://doi.org/10.1029/2019JB018423
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== Images from Paper ==
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In this study, we reproduce figure 2 in this publication. This figure shows 15 CVM-S4.26 Vs profiles. Each profile is an average of 51x51 points around the point of interest. The overlay website below compare
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[[File:Figure_1.png|256px|thumb|left|Fig 1: CVM-S4.26 Model Slices (Image Credit: William Eymold) ]]
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[[File:Figure_2.png |256px |thumb|center| Fig 2: CVM-S4.26 Average Profiles (Image Credit: William Eymold)]]
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== Eymold Jordan JGR ==
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== CVM-S4.26 Model Description ==
[[Image:Figure_1.png |left | 150px | CVM-S4.26 Model Slices]]
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CVM-S4.26 is a tomography improved seismic velocity model for southern California. En-Jui Lee and Po Chen started with a large 500kmx900kmx60km volume in southern California. This model is the 26th tomographic iteration from a starting CVM based on SCEC CVM-S4.
[[Image:Figure_2.png | left | 150px | CVM-S4.26 Average Profiles]]
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Once calculated using tomographic method developed by Jordan, using software developed by Po Chen, and using automated processing method by En-Jui Lee, the CVM-S4.26 model was distributed in several versions by the modelers. There is an ASCII grid version with a separate file for each depth layer. There is a ASCII with all depth slices merged into a single file. There is a binary version used in UCVM. There is another ASCII version available for download from Po Chen's website.
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In this exercise, the Eymold/Jordan authors used a version of CVM-S4.26 that they received directly from En-Jui Lee and develop their own tools for querying the model and calculating the average Vs profiles shown. The other profiles are extracted from the binary version of CVM-S4.26 used in UCVM v18.4.
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The plots below show that the Vs profiles from the latest version of UCVM reproduces the CVM-S4.26 vertical profiles within max difference of 1% or 2%. We haven't identified the source of the differences, but inspection shows the differences seem greatest in the northwestern corner.
  
 
== Comparison Plotting Scripts ==
 
== Comparison Plotting Scripts ==
*[http://moho.scec.org/BILL/compare_po.html Compare Po Model and UCVM Model]
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*[http://moho.scec.org/BILL/compare.html Compare UCVM CVM-S4.26 Model to Billy CVM-S4.26 Model]
  
 
== Related Entries ==
 
== Related Entries ==

Latest revision as of 04:46, 13 March 2020

Prior to release of UCVM in docker version, we are re-verifying the codebase to show that it can reproduce results from previously published papers.

Eymold Jordan JGR

  • Eymold, W. K., & Jordan, T. H. ( 2019). Tectonic regionalization of the Southern California crust from tomographic cluster analysis. Journal of Geophysical Research: Solid Earth, 124, 11840– 11865. https://doi.org/10.1029/2019JB018423

Images from Paper

In this study, we reproduce figure 2 in this publication. This figure shows 15 CVM-S4.26 Vs profiles. Each profile is an average of 51x51 points around the point of interest. The overlay website below compare

Fig 1: CVM-S4.26 Model Slices (Image Credit: William Eymold)
Fig 2: CVM-S4.26 Average Profiles (Image Credit: William Eymold)


CVM-S4.26 Model Description

CVM-S4.26 is a tomography improved seismic velocity model for southern California. En-Jui Lee and Po Chen started with a large 500kmx900kmx60km volume in southern California. This model is the 26th tomographic iteration from a starting CVM based on SCEC CVM-S4.

Once calculated using tomographic method developed by Jordan, using software developed by Po Chen, and using automated processing method by En-Jui Lee, the CVM-S4.26 model was distributed in several versions by the modelers. There is an ASCII grid version with a separate file for each depth layer. There is a ASCII with all depth slices merged into a single file. There is a binary version used in UCVM. There is another ASCII version available for download from Po Chen's website.

In this exercise, the Eymold/Jordan authors used a version of CVM-S4.26 that they received directly from En-Jui Lee and develop their own tools for querying the model and calculating the average Vs profiles shown. The other profiles are extracted from the binary version of CVM-S4.26 used in UCVM v18.4.

The plots below show that the Vs profiles from the latest version of UCVM reproduces the CVM-S4.26 vertical profiles within max difference of 1% or 2%. We haven't identified the source of the differences, but inspection shows the differences seem greatest in the northwestern corner.

Comparison Plotting Scripts

Related Entries