Other
Scientific paper
Dec 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977e%26psl..37..296r&link_type=abstract
Earth and Planetary Science Letters, Volume 37, Issue 2, p. 296-306.
Other
2
Scientific paper
Polycrystalline magnetite and rock samples have been subjected to uniaxial isothermal compression to failure in an attempt to see whether any magnetic expression of dilatancy could be observed. The change in magnetic susceptibility, remanent moment and total moment were recorded continuously as a function of increasing compression. Changes in the slopes of the magnetization-stress curves were observed for stresses corresponding to the onset of dilatancy, and anomalous effects were seen sat the approach to failure. Marked directional changes of the magnetization vector were frequently present. Samples carrying weak field thermo-remanent magnetization stressed in zero field showed anomalous increases in intensity of magnetization. In contrast samples carrying saturation isothermal remanent magnetization were demagnetized on the application of stress in zero field. Single-domain material showed virtually no change due to compression. For multidomain material, magnetic observations permitted prediction of failure in the laboratory. This study suggests the eventual possibility of earthquake prediction using magnetic precursors, particularly with three-component measurements, and it indicates that multidomain materials are better transducers of the seismomagnetic effect than single-domain materials.
Day Ron
Fuller Michael D.
Revol Jacques
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