Early geophysical papers of the Early geophysical papers of the Society of Exploration Geophysicists earlygeophysical00soci Year: 1947 44 T. L. ALLEN their results showed a gradual thinning of the sedimentary beds and a gradual decrease in the velocity values. The seismograms shown in Plate 2 are the ones from which profile B is plotted, Plate 3 shows the seismograms from which profile C is plotted, and Plate 4 shows those from which profile D is plotted. Plate 2.—Seismograms for profile B. STUDY OF RECORDS A study of the three sets of seismograms reveals four distinct record characteristi
Early geophysical papers of the Early geophysical papers of the Society of Exploration Geophysicists earlygeophysical00soci Year: 1947 44 T. L. ALLEN their results showed a gradual thinning of the sedimentary beds and a gradual decrease in the velocity values. The seismograms shown in Plate 2 are the ones from which profile B is plotted, Plate 3 shows the seismograms from which profile C is plotted, and Plate 4 shows those from which profile D is plotted. Plate 2.—Seismograms for profile B. STUDY OF RECORDS A study of the three sets of seismograms reveals four distinct record characteristics. The first five seismograms of profile B, Plate 2, break sharply and plot on the surface velocity curve; the next four seismograms do not break sharply but have a small wave of short period for the first impulse followed by a wave with a sharp break and large amplitude. The small impulse and the sharp break were 374
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