| Abbreviation | Definition |
|---|---|
| JCT | Junction, Texas, Seismograph station code |
| JCW | Jim Creek, Washington, Seismograph Station code |
| JDEC | Japan Dam Engineering Center |
| JDF | Juan De Fuca plate |
| JFM | Juan Fernandez Microplate |
| JMP | Japan Map Project |
| JMPS | Journal of Mineralogical and Petrological Sciences |
| JNG | Jungle |
| JWL | Jewel |
| K | Permeability factor |
| KA | Kilo Annam |
| kbd | thousands of Barrels per Day |
| KEG | Kamloops Exploration Group |
| KGS | Kansas Geological Survey |
| KGS | Kentucky Geological Survey |
| KISM | Kenya Institute of Surveying and Mapping |
| KM | Kiduah Meyuhad |
| KMFS | Kapiti-Manawatu Fault System |
| KNW | Keenwild Fire Station, Mountain Center, California |
| KOERI | Kandilli Observatory and Earthquake Research Institute |