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Testing Time-Distance Inversions Using Numerical Simulation Data

Testing Time-Distance Inversions Using Numerical Simulation Data. Junwei Zhao, Konstantin V. Parchevsky , Thomas Hartlep , & Alexander G. Kosovichev W.W.Hansen Experimental Physics Laboratory, Stanford University, Stanford, CA94305-4085. Different Models.

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Testing Time-Distance Inversions Using Numerical Simulation Data

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  1. Testing Time-Distance Inversions Using Numerical Simulation Data Junwei Zhao, Konstantin V. Parchevsky, Thomas Hartlep, & Alexander G. Kosovichev W.W.Hansen Experimental Physics Laboratory, Stanford University, Stanford, CA94305-4085

  2. Different Models • Local wavefield simulations: (by Konstantin Parchevsky) • 1. one-piece sound-speed perturbation model: • i. Shallow perturbation • ii. Deep perturbation • 2. two-layer model • Global wavefield simulations: (by Thomas Hartlep) • One whole globe simulations, with multiple active regions with various models employed.

  3. One-Piece Sound-Speed Perturbation Model

  4. The Model We use numerical simulations to get surface wavefields, and then measure travel times, invert the interior structures, and compare the inversion results with the original models. We prescribe a subsurface sound-speed perturbation model following: Then we select two sets of different parameters: shallow perturbation case with ε=0.15, D=1Mm, and R=20Mm, and a deep perturbation case with ε=0.10, D=10Mm, and R=20Mm. A quiet Sun with no sound-speed perturbations was also simulated as a reference.

  5. Comparing Expected Travel Times with Measured Travel Times: Shallow Case

  6. Comparing Expected Travel Times with Measured Travel Times: Deep Case

  7. Inversions

  8. Comparing Inversion Results with Model: Shallow Case

  9. Comparing Inversion Results with Model: Shallow Case

  10. Comparing Inversion Results with Model: Deep Case

  11. Comparing Inversion Results with Model: Deep Case

  12. Two-Layer Perturbation Model

  13. Comparing Inversion Results with Model

  14. Comparing Inversion Results with Model

  15. Global Wavefield Simulations with Multiple Active Regions

  16. Medium Size Active Regions

  17. Travel Time Maps (1)

  18. Travel Time Maps (2)

  19. Inverted Results

  20. Small Size Active Region

  21. Travel Time Maps (1)

  22. Travel Time Maps (2)

  23. Conclusion Time-distance pipeline inversion code is working well, but not perfectly. We are still working to improve it, although not sure how much we can improve.

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