By C. M. Snelson, T. M. Brocher, K. C. Miller, T. L. Pratt, and A. M. Tréhu
Seismic Velocity Depth Slices
E1. 3-D P-wave velocity depth slices at 0, 400 m, 800 m, and 1.2 km.
At 0 and 400 m depth, the outline of the survey is very clear. The lack of closer source-receiver pairs shows in the lack of crossing rays.
At 800 m to 1.2 km depth, The Hood Canal and Seattle faults are labeled. The outline of the waterways is in light gray.
The black stars are the shot point locations with shot point 1 and 35 labeled.
E2. 3-D P-wave velocity depth slices at 1.6, 2, 4, and 6 km.
From 1.6 to 4 km depth, the velocity in the basin is still very slow. The cross-lines help define the low velocities under
Seattle urban corridor well. At 6 km, the low velocity nature of the basin is still present, but the cross-lines are less resolved.
The Hood Canal and Seattle faults are labeled. The outline of the waterways is in light gray. The black stars are the shot point
locations with shot point 1 and 35 labeled.
E3. 3-D P-wave velocity depth slices at 8 and 12 km.
At 8 km depth, the low velocities of the basin are still prevalent and outline the basin well. At 12 km depth,
the ray coverage is significantly lower and resolution is poor. The Hood Canal and Seattle faults are labeled.
The outline of the waterways is in light gray. The black stars are the shot point locations with shot point 1 and 35 labeled.
These figures are a series of P-wave velocity depth slices starting at 0 km down to 12 km.
The images show the extent of the 3-D inversion related to the 2-D images in the paper (Fig. 6).
1-D Velocity Curves and Data
These links are to the 1-D curves and related data. The data were sample at regular intervals across the model space.
E4. 1-D curves for the P- and S-wave velocity models presented in the paper. Curves are represented at 40, 60, 80 and 100 km in model space (or 30, 50, 70, and 90 km in receiver space). Both the P- and S-wave curves show a decrease in velocity in the upper 7 km of the basin. The P-wave curve shows a change in the upper portion of the basin related to the sub-basins in the eastern portion of the velocity model (Fig. 6 in paper).
E5. The excel spreadsheet are the actual values from the velocity models. The first column is depth and the second is velocity at 0.2 km/s intervals. The files are names associated with the position and the model sampled. For example, tab 20kmpwavefull is position 20 km in model space (or 10 km in receiver space) and P-wave data.