Accession Number : AD0636726
Title : SEISMIC PROPAGATION STUDIES IN THE ARCTIC REGION USING NOVEL TYPE OF ELECTROMECHANICAL TRANSDUCER.
Descriptive Note : Technical rept.
Corporate Author : ARMY ELECTRONICS COMMAND FORT MONMOUTH N J
Personal Author(s) : Johnson, Ronald F. ; Fischer,Wolfgang H.
Report Date : JUL 1966
Pagination or Media Count : 47
Abstract : Various measurements were made using a novel type of transducer for generating and receiving continuous seismic waves (CSW) in different media. The performance of these transducers on thin lake ice suggested that the range of application should be extended to permafrost and glacial ice. Experiments and measurements that were made in the area of Camp Tuto, Greenland, June 1965, are discussed in this report. The results of these experiments have shown that CSW propagation is possible in glacial ice as well as in permafrost. With power levels on the order of a few watts at the transmitter transducer the signal could be received over distances up to 200 m. For the transition zone in glacial ice the attenuation was found to be about 0.3 dB/m, whereas the very low value of 0.02 dB/m caused by a ducting effect existed in permafrost. Propagation experiments were also made in the ice tunnel near Camp Tuto. (Author)
Descriptors : (*SEISMIC WAVES, PROPAGATION), (*GEOPHYSICAL PROSPECTING, SEISMIC WAVES), ARCTIC REGIONS, PERMAFROST, GLACIERS, GEOPHYSICS, SEISMOLOGY, TRANSDUCERS
Subject Categories : Geology, Geochemistry and Mineralogy
Distribution Statement : APPROVED FOR PUBLIC RELEASE