These figures show travel time residuals for both WENA1.0 and iasp91 in histogram form at all the stations we tested along with the travel time residual surfaces (WENA1.0-iasp91) computed using the 3D finite difference algorithm. Histograms of residuals GT25-iasp91 and GT25-WENA1.0 show the variance reduction provided (VR) by the WENA1.0 model. While WENA1.0 does not improve travel time prediction at all stations we find that the overall prediction is improved by 29% for the entire GT25 dataset (Figure 81).
Model-based correction surfaces representing the variation in travel-time as a result of three-dimensional velocity structure in the WENA1.0 model relative to iasp91 are also plotted for all stations. The surfaces represent the travel time variations at 10 km depth as seen by each station. Travel time differences of up to ±6 s relative to iasp91 are seen, most in areas of very thick crust or sediment. Note that although these surfaces were derived without any of these data they reflect the trends in many places, and the remaining misfit should be due to either structure not captured in the model or conflicting picking errors.
Each figure is labeled by the station name, and the caption for the correction surfaces is the same for all stations thus we describe the legend once: the station location is shown by the black triangle, blue indicates fast regions and red indicates slow, and the circles are the empirical travel time residuals of the GT25 dataset relative to iasp91, color coded using the same scale as the correction surface for direct comparison.
Figure 1. Correction surface for AJM.
Figure 2. Correction surface for APA.
Figure 3. Correction surface for ARO.
Figure 4. Correction surface for BGCA.
Figure 5. Correction surface for BKR.
Figure 6. Correction surface for BRVK.
Figure 7. Correction surface for CFTV.
Figure 8. Correction surface for DHJN.
Figure 9. Correction surface for ELL.
Figure 10. Correction surface for FRU.
Figure 11. Correction surface for FUL.
Figure 12. Correction surface for HYA.
Figure 13. Correction surface for KAD.
Figure 14. Correction surface for KBS.
Figure 15. Correction surface for KDS.
Figure 16. Correction surface for KEV.
Figure 17. Correction surface for KHE.
Figure 18. Correction surface for KHO.
Figure 19. Correction surface for KUK.
Figure 20. Correction surface for LKO.
Figure 21. Correction surface for MAIO.
Figure 22. Correction surface for MBO.
Figure 23. Correction surface for MFP.
Figure 24. Correction surface for MLR.
Figure 25. Correction surface for NIL.
Figure 26. Correction surface for NUR.
Figure 27. Correction surface for OBN.
Figure 28. Correction surface for PGD.
Figure 29. Correction surface for PTO.
Figure 30. Correction surface for QUE.
Figure 31. Correction surface for RYD.
Figure 32. Correction surface for SHI.
Figure 33. Correction surface for SVE.
Figure 34. Correction surface for TAB.
Figure 35. Correction surface for TAM.
Figure 36. Correction surface for TCF.
Figure 37. Correction surface for TIC.
Figure 38. Correction surface for TIO.
Figure 39. Correction surface for UZH.
Figure 40. Correction surface for ZGN.
Figure 41. Histogram for AJM.
Figure 42. Histogram for APA.
Figure 43. Histogram for ARO.
Figure 44. Histogram for BGCA.
Figure 45. Histogram for BKR.
Figure 46. Histogram for BRVK.
Figure 47. Histogram for CFTV.
Figure 48. Histogram for DHJN.
Figure 49. Histogram for ELL.
Figure 50. Histogram for FRU.
Figure 51. Histogram for FUL.
Figure 52. Histogram for HYA.
Figure 53. Histogram for KAD.
Figure 54. Histogram for KBS.
Figure 55. Histogram for KDS.
Figure 56. Histogram for KEV.
Figure 57. Histogram for KHE.
Figure 58. Histogram for KHO.
Figure 59. Histogram for KUK.
Figure 60. Histogram for LKO.
Figure 61. Histogram for MAIO.
Figure 62. Histogram for MBO.
Figure 63. Histogram for MFP.
Figure 64. Histogram for MLR.
Figure 65. Histogram for NIL.
Figure 66. Histogram for NUR.
Figure 67. Histogram for OBN.
Figure 68. Histogram for PGD.
Figure 69. Histogram for PTO.
Figure 70. Histogram for QUE.
Figure 71. Histogram for RYD.
Figure 72. Histogram for SHI.
Figure 73. Histogram for SVE.
Figure 74. Histogram for TAB.
Figure 75. Histogram for TAM.
Figure 76. Histogram for TCF.
Figure 77. Histogram for TIC.
Figure 78. Histogram for TIO.
Figure 79. Histogram for UZH.
Figure 80. Histogram for ZGN.
Figure 81. Histogram for all events at all stations combined.
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