. The Earth beneath the sea : History . Fig. 3. Compressional velocity-porosity data for sediments and sedimentary rocks com- pared with empirical equations of Nafe and Drake. from Figs. 1 and 3 that many samples can be found for which the observed points lie close to the Wood equation even at low porosity. Observations suggest that initial distribution on the V-(f) plot is governed by the Wood equation but that subsequent compaction and cementation have the effect of displacing the points upward along the direction of the curves shown in Fig. 3. The occurrence of measured velocities less than
. The Earth beneath the sea : History . Fig. 3. Compressional velocity-porosity data for sediments and sedimentary rocks com- pared with empirical equations of Nafe and Drake. from Figs. 1 and 3 that many samples can be found for which the observed points lie close to the Wood equation even at low porosity. Observations suggest that initial distribution on the V-(f) plot is governed by the Wood equation but that subsequent compaction and cementation have the effect of displacing the points upward along the direction of the curves shown in Fig. 3. The occurrence of measured velocities less than water velocity is now well documented. Katz and Ewing (1956) found evidence of a low-velocity layer at the top of the sediments on twelve seismic refraction stations in the Atlantic
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