Advances in portable and high-precision terrestrial gravimeters are creating new opportunities to observe water and mass change across groundwater systems, watersheds, and the critical zone. Micro-terrestrial gravimetry can directly sense subsurface mass redistribution associated with groundwater depletion and recharge, aquifer storage change, surface water–groundwater exchange, subsidence, and hydrologic responses to climate variability and human activities. This session invites contributions that use terrestrial gravimetry to investigate hydrologic and near-surface Earth processes, including groundwater monitoring, aquifer characterization, managed aquifer recharge, land subsidence, snow and soil moisture change, surface water variations, volcanic and geothermal hydrology, earthquakes, tides, and integration with GNSS, InSAR, extensometers, leveling, well observations, and hydrologic or geomechanical models. We welcome field studies, methodological advances, and emerging applications involving absolute, relative, superconducting, and hybrid gravity observations. The session aims to connect communities across hydrology, geodesy, and environmental change and to highlight gravity-based approaches for understanding and managing water resources.

• H - Hydrology
• NH - Natural Hazards