| Abbreviation | Definition |
|---|---|
| GICS | Geographic Identification Code Scheme |
| GIR | Geotechnical Interpretive Report |
| GIS | Geographical Information System |
| GKI | Great Keppel Island |
| GL | Geograpic Location |
| GLN | Global Location Number |
| GLO | Gloucester, Massachusetts, Seismograph station |
| GLOBE | Global Learning And Observation To Benefit The Environment |
| GLOL | Geology Labs On-Line |
| GLORIA | Geological LOng-Range Inclined ASDIC |
| GLSL | Great Lakes and St. Lawrence |
| GLWG | Glaciated Landscapes Working Group |
| GM | Geological Modeler |
| GM | Geology and Minerals |
| GMCS | Geology Mathematics Computer Science |
| GMF | Geology Multi File |
| GML | Geography Markup Language |
| GMNA | Geologic Map of North America |
| GND | Ground |
| GNDB | Geographic Names DataBase |