Mathematics – Logic
Scientific paper
Apr 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.2851w&link_type=abstract
Journal of Geophysical Research, vol. 87, Apr. 10, 1982, p. 2851-2859. NSF-supported research.
Mathematics
Logic
88
Crustal Fractures, Earthquakes, Piezoelectricity, Radio Emission, Wave Propagation, Chile, Geological Faults, Quartz, Stress Distribution
Scientific paper
Stress-induced piezoelectric fields produce freely propagating electromagnetic radiation when microscopic rock fractures occur in quartz-bearing rocks. A laboratory study is presented which shows that electromagnetic emissions are produced when microfractures occur in Westerly granite. A detailed model is presented for the emission process which allows an estimate of the total radiated power from an individual microfracture. On the basis of these results a case is presented that an unusual radio emission seen on several widely separated radio astronomy receivers in the Northern Hemisphere on May 16, 1960, was due to a stress-induced microfracture along the Chilean fault. This radio event occurred 6 days prior to the great Chilean earthquake of May 22, 1960, and may have been a precursor to one of the largest earthquakes of this century.
Meyer T. R.
Stoker Carol
Warwick James W.
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