| Abbreviation | Definition |
|---|---|
| PREM | Preliminary Reference Earth Model |
| PRM | pressure remanent magnetization |
| PRR | Pleasant Run Run |
| PRV | Pearl River Valley |
| PSDA | Probabilistic Seismic Demand Analysis |
| PSHA | Probabilistic Seismic Hazard Analysis |
| PT | Permian Tertiary |
| PTM | Puff Trajectory Model |
| PTPK | Patty Peak Seismic Station, Patty Peak, Alaska |
| PV | Penobscot Valley |
| PV | Potomac Valley |
| PVR | Potential Vertical Rise |
| PVS | Principle Variation Search |
| PZM | Pressure Zone Monitor |
| QC | Quick Core |
| QFL | Quartz Feldspar Lithics |
| QFP | Quartz Feldspar Porphyry |
| QGE | Quasi-Geostrophic Equation |
| QGS | Quasi-Geostrophic System |
| QIT | Quebec Iron Titanium |