Seismic Holography in a Norwegian Fiord
The classical methods used in seismic surveys are based on measuring the time taken for a pulse of sound to travel from a sound source to a receiver via the various geological reflectors. Another use of sound in seismic surveys would be to sample the returning wavefront with phase and amplitude over an area. The measured wavefront can be used to reconstruct the geological reflectors. In this paper most emphasis is put on an experiment in seismic holography carried out in a Norwegian fiord to determine the feasibility of the method. Both the registration and the processing techniques employed are discussed. Examples of reconstructions of the geological structure together with a comparison with results obtained by classical methods are presented. The possibility of using optical methods to reconstruct acoustical fields is also discussed.
KeywordsClay Petroleum Convolution Acoustics Hydrophone
Unable to display preview. Download preview PDF.
- 1.J.B. Farr: Earth Holography as a Method to Delineate Buried Structures. Acoustical Holography, Vol. 6, Plenum Press, 435 (1975).Google Scholar
- 2.G.L. Fitzpatrick, H.R. Nicholls, R.D. Munson: An Experiment in Seismic Holography. Bureau of Mines Report of Investigation No. 7607, 1972.Google Scholar
- 3.K.H. Waters: Reflection Seismology. (John Wiley & Sons, 1978 ).Google Scholar
- 6.T.H. Demetrakopoulous: Synthetic Holograms and Image Reconstructions from Suboptical Diffraction Patterns. Thesis, University of Illinois at Urbana, 73-A.542, University Microfilms, Ann Arbor, Michigan, USA.Google Scholar
- 8.O. Løvhaugen, E. Mehlum: Transformation of Long Wavelength Wavefronts to Optical Holograms. To be submitted for publication.Google Scholar