Depth calculation of piezomagnetic effect for earthquake prediction

Details Depth calculation of piezomagnetic effect for earthquake prediction Depth calculation of piezomagnetic effect for earthquake prediction

Sep 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977e%26psl..36..309c&link_type=abstract

Earth and Planetary Science Letters, Volume 36, Issue 2, p. 309-316.

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Scientific paper

Tectonic stresses acting in the lithosphere cause transitory changes in the magnetic properties of rock and thus of its observed magnetic field. Calculations have been made to estimate this piezomagnetic effect as a function of depth, by considering the relative stress sensitivity of magnetite with increasing temperature and hydrostatic pressure. The response of magnetization to seismotectonic stress is determined by an appropriate balancing of magnetocrystalline and magnetoelastic anisotropy energies. Magnetite becomes progressively more responsive to applied stress as depth increases, with the rate of change depending on the local geothermal gradient. The upper 15 km of the lithosphere is likely to be the most important in yielding observable piezomagnetic field anomalies for earthquake prediction.

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