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Review of Blasting Operations of Summit Bock <br />ANALYSES of BLASTING IMPACTS, cont' <br />by the square root of the maximum charge weight per delay. The log-log linear relationship <br />between scaled distance and predicted peak particle velocity (ppv) is shown in equation 2.1 on <br />page 10 of this report. <br />These ground vibrations are elastic waves, meaning that the ground particles move as the wave <br />passes and quickly come to rest exactly as they were before the waves arrived. The average person <br />is quite sensitive to ground motion, and can feel vibration at levels several orders of magnitude <br />lower than motion at damage threshold levels. The human body can detect ground particle <br />motion occurring at velocities as low as 0.50 mm/s (0.02 in/s). <br />Waveform -Seismic Signal <br />Velocity of Particle Motion measured with <br />respect to time <br />Peak <br />~./ `~' BASE <br />~ ~ LINE <br />I <br />i <br />h--- CYCLE <br />I)iIRATION <br />TIME _ <br />Figure 2.2-Particle Vibration Time History <br />Vibrating ground motion can be characterized by measuring particle displacement, velocity, <br />acceleration, and vibration frequency. <br />