| Abbreviation | Definition |
|---|---|
| MAMD | Mount Amiata Mining District |
| MBOD | Million Barrel Over Day |
| MC | Mountain Crest |
| MCA | Mid- Continent Area |
| MCEER | Multidisciplinary Center for Earthquake Engineering |
| MCS | Multi-Channel Seismic |
| MCU | Mineral Collectors of Utah |
| MDE | maximum design earthquake |
| MDT | Modular Dynamic formation Tester |
| MERS | Microwave Earth Remote Sensing |
| MF | Mantle Floor |
| MF | Mount Fuji |
| MFI | Melt Flow Index |
| MFP | Moca Fernando Poo, Equatorial Guinea, Seismograph station code |
| MFPR | Middle Fork Payette River |
| MFT | Main Frontal Thrust |
| MG | Mesotrophic Grassland |
| MGD | Mines and Geology Division |
| MGO | Marine Gas and Oil |
| MGR | Marine and Geology Repository |