Travel times and amplitudes of the Pn and P waves generated by the nuclear explosion Salmon fired in the State of Mississippi are studied. To the west the Pn waves are found to be cut off at a distance of about 1800 km, where they are about to enter the mountainous region. An increase of P amplitude with distance goes to confirm that the P velocity increases with depth and to indicate that the time-curve is a continuous, bending curve.

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