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Blasting impacts and Rock Slope Stability Assessment for Cottonwood QNry in Grand County, CO <br />Abhreviatiorm <br />SH = Shear v eve. haftordat <br />SV = Shear wave, vertical <br />R = Rayleigh wave <br />P = Conyressiorml wave <br />* P <br />SH <br />SV <br />, <br />o�, <br />ffw <br />as <br />10, <br />i�w <br />["n�� <br />Figure 3.1— Typical Vibration Waves <br />Velocity of Parttcle Motion or Air Overpressure Plotted <br />with respect to tlme <br />1 CYCLE <br />r <br />a Noin Base <br />a Mlle <br />Peak <br />Ampfihrde <br />Event Ou mflon <br />TIME <br />�D <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 />• Particle velocity <br />• Particle acceleration <br />• Vibration frequency <br />REVEY Associates, Inc. Page 5 April 20D4 <br />