The Oklahoma earthquake of April 9, 1952 provided an instrumental study of seismograms throughout the United States. There is good evidence for the existence of crustal layers, and consequently a shallow depth of focus. The normal velocities of P and S obtained were 8.07 and 4.43 km/sec. This paper is a summary of a Master's thesis in geophysics at the Saint Louis University Institute of Technology. The complete thesis may be consulted in the Institute library.
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Henry Miller (1956) studied this question.
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