Seismic Profiling with a Parametric, Self-Demodulated Ricker Wavelet
The nonlinear self-demodulation of a burst of high frequency sound produces a highly directive, low frequency transient in the parametric array process. Ricker wavelets, of interest in exploration seismology, can be generated from the self-demodulation of a primary pulsed in a Gaussian envelope. The application of this process to sub-bottom profiling is explored in terms of resolution and depth of penetration. Sea trials conducted in a complicated geological area offshore Oahu, Hawaii, U.S.A., are discussed. It is shown that parametric operation can lead to greater depth of penetration in the sediments for systems compared on the basis of equal angular resolution and transducer size.
KeywordsSurficial Sediment Fresnel Zone SALT Dome Seismic Exploration Nonlinear Acoustics
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- Kosalos, J., 1978, “A Deep Towed 3 kHz Parametric Source,” in Proceedings Joint USN/SEG Symposium, NORDA, Bay St. Louis, MS.Google Scholar
- McDonald, B. Edward, and Kuperman, W. A., 1986, “Time Domain Formulation for Pulse Propagation, Including Nonlinear Behavior at a Caustic,” submitted to J. Acoust. Soc. Am.Google Scholar
- Mellen, R. H., and Browning, D. G., 1970, “Self-Demodulation of Acoustic Waves,” in “Nonlinear Acoustics,” Proceedings of the 2nd International Symposium on Nonlinear Acoustics, ARL:UT, Austin, Texas, T. G. Muir, ed., p. 57.Google Scholar
- Moffett, M. B., 1970, “Large-Amplitude Pulse Propagation, A Transient Effect,” in “Nonlinear Acoustics,” Proceedings of the 2nd International Symposium on Nonlinear Acoustics, ARL:UT, Austin, Texas, T. G. Muir, ed., p. 143.Google Scholar
- Muir, T. G., et al., 1980, “A Low-Frequency Parametric Research Tool for Ocean Acoustics,” in “Bottom Interacting Ocean Acoustics,” W. A. Kuperman and F. B. Jensen, eds., Plenum Press, New York, pp. 467–483.Google Scholar
- Muir, T. G., and Goldsberry, T. G., 1981, “Signal Processing Aspects of Nonlinear Acoustics,” in “Underwater Acoustics and Signal Processing,” Proceedings NATO Advanced Study Institute, Copenhagen, L. Bjorno, ed., D. Reidel, Boston.Google Scholar
- Muir, T. G., and Vestrheim, M., 1979, “Parametric Arrays in Air with Application to Atmospheric Sounding,” in Proceedings of the 8th International Symposium on Nonlinear Acoustics, Journal de Physique. Paris, P. Alais and A. Zarembowitch, eds., pp. C8–89.Google Scholar
- Tsutsui, B., Campbell, J., Frisbee, J., and Coulbourn, W. T., 1986, “Storm Generated, Episodic Sediment Movements off Kahi Point, Oahu, Hawaii,” Hawaii Inst. Geophys. Rept., in publication.Google Scholar
- Unterberger, R. R., Wang, A. M., and Muir, T. G., 1980, “Nonlinear Sonar Probing of Salt,” in “Proceedings of the 50th Meeting of the Society of Exploration Geophysics,” Vol. III, 1795–1824.Google Scholar
- Urick, R. J., 1967, “Principles of Underwater Sound for Engineers,” McGraw-Hill, New York.Google Scholar
- Wyber, R. J., 1985, personal communication.Google Scholar