SEISMIC PROPAGATION STUDIES IN THE ARCTIC REGION USING NOVEL TYPE OF ELECTROMECHANICAL TRANSDUCER.

• Main Authors: Johnson, Ronald F., Fischer,Wolfgang H.
• Other Authors: ARMY ELECTRONICS COMMAND FORT MONMOUTH N J
• Format: Text
• Language: English
• Published: 1966
• Subjects: Geology; Geochemistry and Mineralogy; Seismology; (*SEISMIC WAVES; PROPAGATION); (*GEOPHYSICAL PROSPECTING; SEISMIC WAVES); ARCTIC REGIONS; PERMAFROST; GLACIERS; GEOPHYSICS; TRANSDUCERS; Arctic; Greenland; Ice; permafrost
• Online Access: http://www.dtic.mil/docs/citations/AD0636726; http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0636726

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)