The seismic refraction survey was carried out to estimate thickness of soil layer over a granitic rock. Sesimic velocity in the soil layer was observed as 3.0 kma-1, while it was 6 kms-1 in hardrcok. The crossover distance(distance at which direct and doubly refraced ray reaches at same time) is fount out to be 2km. What is the thickness of the soil layer.
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ছথঠৌপংছংঔফঠংজংঅঝদছীঋডূংঋঋ
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In refraction seismic work, that distance at which the direct wave in an upper medium is matched in arrival time by that of the refracted wave from the medium below having greater velocity.
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