The past decade has seen some very exciting developments in time-lapse or 4D gravity surveys. We are very pleased to present a diverse sampling of applications and new technologies in this special section of GEOPHYSICS, which captures the state of the art in 4D gravity at a time when new reservoir-monitoring applications are maturing into operational status. We think these methodologies have an important future in the development of energy and groundwater resources as well as in carbon sequestration and reduction of natural hazards. It is our hope that the papers in this special section will stimulate further application and development of 4D gravity methods.

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