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| Abbreviation | Definition |
| B. P. | Before Present |
| CRBF | Coast Range Boundary Fault |
| CRVP | Coast Range Volcanic Province |
| CV | Crescent Volcanics |
| DAT | Digital Audio Tape |
| DBfz | Discovery Bay fault zone |
| DMF | Darrington-Devils Mountain Fault |
| GMT | Greenwich Mean Time |
| GPS | Global Positioning System |
| HDF | Hood Canal-Discovery Bay Fault |
| M.C. | Metchosin Igneous Complex |
| m.s.l. | mean sea-level |
| m. y. | million years |
| NOAA | National Oceanographic and Atmospheric Administration |
| R.V. | Research Vessel |
| SFZ | Seattle Fault Zone |
| SWIF | Southern Whidbey Island Fault Zone |
| TWT | two-way traveltime (seismic P-wave) |
| USGS | United States Geological Survey |