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THE PULSED VIBRATOR AS A SEISMIC SOURCE *
Author(s) -
EVISON F. F.
Publication year - 1957
Publication title -
geophysical prospecting
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.735
H-Index - 79
eISSN - 1365-2478
pISSN - 0016-8025
DOI - 10.1111/j.1365-2478.1957.tb01440.x
Subject(s) - vibrator (electronic) , seismic vibrator , explosive material , waveform , geology , acoustics , seismic wave , geophysics , gemology , seismology , physics , engineering geology , tectonics , chemistry , organic chemistry , quantum mechanics , voltage , volcanism
Non‐explosive seismic sources, notably the falling weight and the eccentric machine, have occasionally proved advantageous in experimental and practical seismology in spite of their relative feebleness. Another alternative is the pulsed vibrator, which offers the advantage of a completely controllable waveform. Recent theory shows that such a source is quite well adapted to the radiation of high frequency waves from the surface of the ground; it is estimated, for example, that in typical circumstances reflections should be obtainable from depths of the order of 200 metres. The theory also shows how resonances may be avoided so as to radiate the impulsive waveform unimpaired.