Seismic refraction
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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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Seismic Refraction

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Seismic refraction

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


Seismic refraction1

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

Source: geosystems.ce.gatech.edu/Faculty/Mayne/Research/misc/SeismicRefraction.ppt


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