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L20_SeismicRefractionIII-page3

L20_SeismicRefractionIII-page3 - • Isolated site adjacent...

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Applied Geophysics – Refraction III Generalized reciprocal method Procedure: Time-depth function, T G • Calculate T G as a function of offset AG for a variety of XY distances • Optimal XY is identified by the roughest T G curve • Calculate average velocity from surface to refractor • Calculate the depth from T G and the average velocity T G Offset AG ' 2 ' 2 V T XY XY V V G + = 2 2 ' ' V V V V T h G = Applied Geophysics – Refraction III Rockhead determination for waste disposal site Example Refraction study to determine if a permit should be issued for a waste disposal site Site description:
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Unformatted text preview: • Isolated site adjacent to a river. • Basalt basement rock outcrops adjacent to site on far side from the river. • Basal believed to underlie entire site. • Overburden is alluvium and windblown sand Refraction deployment: • Sledge hammer ineffective due to high attenuation of loose surface sand. Used explosives • Series of geophone arrays used to form one long array across the site • For each array use one short and one long offset shot at each end plus a mid-spread shot...
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