| Abbreviation | Definition |
|---|---|
| IRM | Isothermal Remanent Magnetization |
| IRS | Indian Remote Sensing |
| ISBS | In-Situ Bio-geochemical Stabilization |
| ISC | Indian Sub-Continent |
| ISC | International Seismological Center |
| ISCO | In Situ Chemical Oxidation |
| ISES | Integrated Solid Earth Science |
| ISIP | Initial Shut-In Pressure |
| ISL | Isle |
| ISRU | In Situ Resource Utilisation |
| ISSN | Independent Simultaneous Sources with Nodes |
| ITC | Integrated Terrain Compensation |
| IUGG | International Union of Geodesy and Geophysics |
| IUGS | International Union of Geological Sciences |
| IWW | Illinois WaterWay |
| J | Jade |
| JAGG | Journal of Applied Geology and Geophysics |
| JB | Jiaozhou Bay |
| JCSS | Joint Committee on Seismic Safety |
| JCSSR | Joint Committee on Seismic Safety Records |