| Abbreviation | Definition |
|---|---|
| PIL | Pilar, Cordoba Seismograph station code |
| PIMA | Portable Infrared Mineral Analyzer |
| PISE | Pneumatically Impacted Stabilized Earth |
| PJ | Pretty Jewel |
| PLM | Preservation Layer Model |
| PMT | PressureMeter |
| PN | Pacific Northwest |
| PNA | Pacific North American |
| PNWSN | Pacific NorthWest Seismograph Network |
| Po | Pyrrhotite |
| POGO | Polar Orbiting Geophysical Observatory |
| POJ | Pueblo Of Jemez |
| POJGFS | Pueblo Of Jemez Geothermal Feasibility Study |
| POLARIS | Portable Observatories For Lithosphere Analysis And Research Investigating Seismicity |
| POOH | Pull Out Of Hole |
| POR | Point Of Reference |
| PPL | Populated PLace |
| PPME | Pacific Plate Motion Experiment |
| PPV | Peak Particle Velocity |
| PRB | Powder River Basin |