What type of pressure is defined as 'Residual Overpressure'?

Residual Overpressure refers to the long-lasting pressure effects that remain after an explosive event. This pressure does not dissipate immediately; instead, it can persist for a longer duration, affecting the surrounding environment. It is important in understanding the damage potential of blasts, as the residual pressure can lead to additional structural damage or impact on personnel even after the initial explosion has occurred.

The other choices pertain to different aspects of pressure associated with explosions. Return to atmospheric pressure refers to the normalization after a blast, initial explosive pressure signifies the immediate pressure spike at the moment of detonation, and pressure from reflected waves is related to the phenomena where shock waves bounce off surfaces, intensifying their effects, but none of these encapsulate the significance and meaning of long-lasting pressure effects like Residual Overpressure does.