NIOSHTIC-2 Publications Search

An Experiment in Seismic Holography.

Authors
Fitzpatrick-GL; Nicholls-HR; Munson-RD
Source
NTIS: PB 208 009 :20 pages
Link
NIOSHTIC No.
10008840
Abstract
Preliminary results of an experiment in seismic holography indicate that the techniques of acoustical holography may be successfully used with seismic waves to determine the size and general shape of underground objects. This experiment was carried out under field conditions on a moderately large scale compared with the typical laboratory experiments in acoustical holography. The object to be mapped was a 100-foot-diameter, spherical, low-velocity zone of explosively fractured rock in oil shale at an average depth of 80 feet. The seismic wavelength of the fourier component wave used in making the seismic holograms was 50 feet at a frequency of 140 cps. The hologram sampling aperture was 226 feet square and was sampled by 441 geophones in a 21 by 21 rectangular array.
Publication Date
19720101
Document Type
IH; Report of Investigation;
Fiscal Year
1972
NTIS Accession No.
PB-208009
NTIS Price
A03
Identifying No.
RI 7607
Source Name
NTIS: PB 208 009
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division