Replenishing sapped groundwater could trigger small earthquakes: A boom in aquifer injection projects could unlock long-quiet faults.

The article focuses on the potential seismic risks associated with aquifer injection projects, particularly the Hampton Roads Sanitation District's initiative to inject treated wastewater into the Potomac Aquifer in Virginia. This $2.8 billion project aims to replenish the aquifer, which has experienced significant water level declines due to overpumping. While aquifer recharge is essential for maintaining water supplies, experts warn that injecting large volumes of water can increase pore pressure in underlying rocks, potentially triggering earthquakes. Research indicates that a clay layer in the Potomac Aquifer may help mitigate this risk, but ongoing monitoring is crucial as similar projects expand across the U.S. to address growing water demands. [Extracted from the article]