An Introduction to Surface Wave Analysis Michael E. Pasyanos - IRIS

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Inversion vs. Grid-Search Inversion Issues: - Invert for layer thickness - Invert for layer velocity - Starting model - Non-linear inversion - Layer smoothing Grid Search Issues: - Fewer inversion parameters - Usually slower - Unique dispersion curve for each trial model - Can be used to map out model space Programs Computer Programs in Seismology (Bob Herrmann, SLU) is a nice package of software to enable inversion of dispersion measurements (and a lot more) MINOS (Woodhouse, Masters) is a comprehensive package that computes surface wave dispersion by summing normal modes
Tradeoffs among various parameters Pasyanos, M.E. and W.R. Walter (2002). Crust and upper-mantle structure of North Africa, Europe and the Middle East from inversion of surface waves, Geophys. J. Int. 149, 463-481. Adding other types of data (for example, receiver functions) can help reduce these tradeoffs
Page 1 and 2: An Introduction to Surface Wave Ana
Page 3 and 4: Section 1 - Background on Surface W
Page 5 and 6: Group Velocity vs. Phase Velocity S
Page 7 and 8: Rayleigh Waves Designated LR = “L
Page 9 and 10: Rayleigh Waves vs. Love Waves Unrot
Page 11 and 12: Higher Modes Higher mode exist, but
Page 13 and 14: Dispersion Variations: Crustal Thic
Page 15 and 16: Sensitivity kernels Sensitivity ker
Page 17 and 18: Applications Joint inversion of sur
Page 19 and 20: Recent Tectonic History of Middle E
Page 21 and 22: Surface Wave Results for the Middle
Page 23 and 24: Section 2 - Surface Wave Analysis -
Page 25 and 26: Multiple-Filter Analysis PGSWMFA =
Page 27 and 28: Ambient Noise Analysis Has the pote
Page 29 and 30: Consistency between group and phase
Page 31 and 32: Phase Velocity Measurements Two-sta
Page 33 and 34: Seismic Tomography - Importance of
Page 35 and 36: Getting from dispersion maps and di
Page 37 and 38: Inversion vs. grid search The inver
Page 39: Results can be combined to produce
Page 43 and 44: One approach employed in Pasyanos a
Page 45 and 46: Summary § § § § § The analysis
Page 47 and 48: Surface Wave Model - Coverage Paths
Page 49 and 50: Examples get_dispersion 23.522499 4
Page 51 and 52: Tools Comparing between dispersion
Page 53 and 54: Introduction Crustal models like CR
Page 55 and 56: Parameterization Lateral Parameteri
Page 57 and 58: Varying the starting model After cr
Page 59 and 60: We assemble the results to construc
Page 61 and 62: High-resolution regional results fo
Page 63 and 64: Depth slices through the model 50 k
Page 65 and 66: High-resolution regional results fo
Page 67 and 68: The resulting model recovers the di

An Introduction to Surface Wave Analysis Michael E. Pasyanos - IRIS

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