| Abbreviation | Definition |
|---|---|
| PBO | Plate Boundary Observatory |
| PC | Pacific Coast |
| PC | Pocket Computer |
| PCL | Pipe Conveyed Logging |
| PCY | Paradise Canyon |
| PD | Position Difference |
| PDB | Pee Dee Belemnite |
| PDE | Preliminary Determination of Epicenter |
| PEL | Petroleum Exploration License |
| PET | Pile Echo Tester |
| PETM | Paleocene Eocene Thermal Maximum |
| PFMS | Proactive Fault Management System |
| PFRR | Polymers From Renewable Resources |
| PG | Persian Gulf |
| PG | Puerto Galera, the Philippines |
| PGV | Peak Ground Velocity |
| PHIVOLCS | Philippine Institute of Volcanology and Seismology |
| PHW | Primary HeadWater |
| PHWO | Phenakite Natural White gemstone |
| PIG | Pine Island Glacier |