A symposium was organized at the 1986 AGU Spring Meeting in Baltimore, Md., May 19–22, to discuss the role of pore fluids in influencing a number of geologic and geodynamic processes. The symposium began with seven invited papers presented in an All-Union Session. Two half-day sessions sponsored by the Hydrology Section followed. The sessions were designed to provide a broad overview of the topic, with the hope that greater interaction might be stimulated between members of the Hydrology Section and those members in other sections of the Union.

The dynamics of pore fluids are a crucial link in the coupling of hydrologic, thermal, mechanical, and geochemical processes that occur in the upper crust of the earth. These processes act on a wide range of spatial and temporal scales and at depths ranging from many kilometers to near the surface. Consequently, hydraulic properties such as permeability and compressibility can often be viewed as basic parameters in many geologic and geodynamic processes.