Figure 1. Location of sources, geophones and water table through time in the experiment coordinate system.

Figure 2. Top: Record sections from timeslice 7.5 and 12.5 with significant phases labeled. Bottom: Correlation plot showing the time shift between phases in record 12.5 to record 7.5.

Figure 3. Traveltime curves for the first arrival compressional waves from five sources. Data was recorded at hour 8.5, the reference timeslice.

Figure 4. High and low tide compressional wave velocity models.

Figure 5. Steps used to prepare seismograms for correlation.

Figure 6. Each sheet is a normalized traveltime curve for one timeslice. A mean arrival time has been removed from each station to highlight the time-dependence.

Figure 7. Top: Observed and synthetic Rayleigh waves. Bottom: Dispersion curve that best fits the observed seismograms.

Figure 8. Each sheet displays the change in velocity as a function of frequency for one timeslice.

Figure 9. Left: Shear wave velocity structure. Right: Changes in the structure over the tide cycle compared with the water table level.

Figure 10. Kernel functions for inversion. Each function shows the degree to which frequencies are affected by a given layer.