| Abbreviation | Definition |
|---|---|
| RCZ | Rural Coastal Zone |
| RDG | Ridge |
| RDH | Reference Datum Height |
| REB | Research Earth Borer |
| RFBT | Range Front Blind Thrust |
| RFZ | Romanche Fracture Zone |
| RGD | Rapid Gravity Dewatering |
| RGV | Rio Grande Valley |
| RIG | Running In Ground |
| RIGS | Regionally Important Geological Site |
| RIH | Run In Hole |
| RIS | Reservoir Induced Seismicity |
| RL | Regression Line |
| RLA | Round Lake Area |
| RLE | Review Level Earthquake |
| RMGC | Reform Gravel Mining Coalition |
| RMR | Rock Mass Rating |
| RMR | Rocky Mountain Region |
| ROF | Ring Of Fire |
| RPG | Registered Professional Geologist |