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Janice Lynn Bennett - 81422.PDF Page 9 <br />Blasting Impacts Assessment for the Proposed GCC Rio Grande, Inc Quarry in Pueblo County, Colorado <br />Pb brewattons• <br />SH = Shear %wave, honzontal <br />SV = Shear wave, vertical <br />R = Rayleigh %wave <br />P = Compressional %nave <br />V� . <br />Detonating <br />Charge or other <br />Irrputsne <br />Disturbance <br />Event Duration <br />Figure 3.1 — Typical Vibration Waves <br />Velocity of Particle M di on or Air Overpressure Plotted <br />vuth resped to time <br />Background <br />Noise Base <br />Line <br />pm- <br />TIME <br />Figure 3.2 — Idealized Vibration or Air Overpressure Time — Intensity History Plot <br />The intensity of ground motion can be measured in several ways. These measures include: <br />. Particle displacement <br />1 REVEY Associates, Inc <br />Page 6 July 2002 <br />