. Early geophysical papers of the Society of Exploration Geophysicists. Petroleum; Prospecting. 48 T. L. ALLEN than iA' but had four times as much dynamite, and the small fore- runner wave is very evident on this record. This proves conclusively that the formation which transmits the small forerunner type of wave is a continuous acoustic horizon which does not transmit the seismic energy readily. CONSIDERATION OF DIFFERENT PHASES OF THE PROBLEM The problem presented here might be thought of from two differ- ent angles. If all horizons had been of equal energy-carrying ability,. Plate 3.—Seismo
. Early geophysical papers of the Society of Exploration Geophysicists. Petroleum; Prospecting. 48 T. L. ALLEN than iA' but had four times as much dynamite, and the small fore- runner wave is very evident on this record. This proves conclusively that the formation which transmits the small forerunner type of wave is a continuous acoustic horizon which does not transmit the seismic energy readily. CONSIDERATION OF DIFFERENT PHASES OF THE PROBLEM The problem presented here might be thought of from two differ- ent angles. If all horizons had been of equal energy-carrying ability,. Plate 3.—Seismograms for profile C. the third one would have been difficult to detect, due to the fact that the particular thicknesses and velocities are such that the third hori- zon impulse would never have been first. On the other hand, it would be easy to neglect the beds which transmitted energy poorly unless sufficient dynamite was used to make the first impulse large enough to be seen. In the area where this work was done, the dynamite charge was chosen that would give just enough amplitude to the second horizon wave to make it apparent, yet not so large that it obscured the large secondary impulse from the third horizon. In this manner, 378. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Society of Exploration Geophysicists. Tulsa
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