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t1 t2 t3 t4. Determine depth to rock layer, z R. Vertical Geophones. Source (Plate). x1 x2 x3 x4. z R. oscilloscope. Seismic Refraction. ASTM D 5777. Note: V p1 < V p2. Soil: V p1. Rock: V p2. 1. V p2 = 4880 m/s. x c = 15.0 m. 1. V p1 = 1350 m/s.
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