What is Scaled Distance?
Scaled distance is a relationship used to relate similar blast effects from various explosive weights at various distances. Scaled distance gives a blaster an idea of expected vibration levels based upon prior blasts detonated at a project. It is calculated by taking the distance in feet from the blast (source) to the receiver and dividing it by the square root of the maximum pounds of explosives detonated per delay. It is for estimation and may supplement actual seismograph measurements.
