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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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In seismograph exploration, the author has encountered acoustic horizons which do not transmit seismic energy readily. The first impulse on the seismogram has a short period with small amplitude, and requires considerable energy to make it apparent at long distances. This horizon is underlain by one of slightly higher velocity which transmits the energy readily and has a distinctly different wave form. On account of the difficulty of energy transmission, the horizon which has the small "forerunner" wave might be interpreted as a lens and not a continuous horizon. By making use of the character of the wave form on the seismograms, the two horizons may be definitely identified, and the one which is a poor conductor of energy definitely proved to be a continuous acoustic hor zon.
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