Micropulsation measurements during the Puget Sound earthquake of April 29, 1965
James F Kenney, Leonard E. Johnson, Boeing Scientific Research Laboratories, Seattle. Geo-Astrophysics Laboratory
Geo-Astrophysics Laboratory, 1966 - Nature - 22 pages
The emf's induced in micropulsation coils were analyzed to compute an epicenter and to look for possible magnetic signals generated by the Puget Sound earthquake of April 29, 1965. The epicenter calculated by this method agrees with that published by Algermissen and Hardy (1965) within the limits of experimental error. The search for magnetic precursors yielded negative results. The upper limit to the dipole moment of the stressed region was determined to be 2.5 x 10 to the 13th power cgs emu. It is concluded that, at least in this area, the possibility of using the piezomagnetic effect as a useful pre-indication of earthquake activity is rather remote. (Author).
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amplifier chain analyzed April 29 BOEING SCIENTIFIC RESEARCH Breiner cgs emu Cougar Mountain detect detectors at Tulalip determined dipole earth motion earth movement earth-current detectors Earth's magnetic field Earth's surface earthquake activity earthquake of April emf's induced epicenter Epicentral Separation equipment experimental error field and earth-current Figure induced in micropulsation James F Kenney Leonard limits of experimental located look for possible magnetic disturbance magnetic flux density MAGNETIC PRECURSORS magnetic tape magnetostrictive magnitude method agrees micropulsation coils MICROPULSATION MEASUREMENTS natural micropulsation activ Nevada piezomagnetic possible magnetic signals pre-indication of earthquake prior published by Algermissen Puget Sound earthquake quake rate of change recorded response rock rotation Schematic representation SCIENTIFIC RESEARCH LABORATORIES search for magnetic Seattle seismic seismomagnetic effect separation distance Spectral analysis stations stressed region telluric-current probes three induction loops three magnetic Tulalip and Cougar upper limit variation velocities Washington wave arrived yielded negative results