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L20_SeismicRefractionIII-page4

L20_SeismicRefractionIII-page4 - overburden velocities...

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Applied Geophysics – Refraction III Rockhead determination for waste disposal site Example Forward shots Long offset shot • No direct arrivals as no geophones close enough • Arrives earlier due to shallower refractor depth beneath long offset shot Direct arrivals provide
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Unformatted text preview: overburden velocities along profiles Near parallel arrivals tell us there is near-constant lower layer velocity How many layers? Applied Geophysics Refraction III Rockhead determination for waste disposal site Example Reversed shots Forward shots...
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