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Seismic Refraction

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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Seismic Refraction

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  1. t1 t2 t3 t4 Determine depth to rock layer, zR Vertical Geophones Source (Plate) x1 x2 x3 x4 zR oscilloscope Seismic Refraction ASTM D 5777 Note: Vp1 < Vp2 Soil: Vp1 Rock: Vp2

  2. 1 Vp2 = 4880 m/s xc= 15.0 m 1 Vp1 = 1350 m/s Seismic Refraction Depth to Rock: zc = 5.65 m t values x values

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