Science Advances

Supplementary Materials

This PDF file includes:

  • section S1. Sediment property calculation
  • section S2. Water column/sediment artifacts
  • section S3. Alternate migration models
  • section S4. Dipping layers
  • section S5. Model reliability
  • section S6. Comparison between geodynamic models and receiver functions
  • section S7. Additional geodynamic modeling details
  • table S1. P-to-S delays measured from Cascadia Initiative Array stations.
  • fig. S1. Map view of negative receiver function discontinuity at 60 to 80 km.
  • fig. S2. Example of good-quality ocean-bottom seismograms and receiver functions.
  • fig. S3. Average delay times at each station between P-wave arrival and P-to-S conversion from the base of the sediment layer.
  • fig. S4. Sediment VP and VS used in the waveform rotation and migration derived from P-to-S sediment conversion delay times at each station.
  • fig. S5. Comparison of sediment thickness estimate to global sediment thickness (50).
  • fig. S6. Example of receiver functions recorded at single stations.
  • fig. S7. Example of receiver function and geodynamic models.
  • fig. S8. Comparison of geodynamic models and seismic predictions.
  • References (48–59)

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