Abstract
Piezomagnetic field variations can result from tectonic stress changes in the focal zone of an impending earthquake. Interpretation of such observed tectonomagnetic effects requires modeling of the stress response of magnetic properties of the lithosphere. Calculations have been made to estimate the here piezomagnetic effect as a function of depth, by considering the effect of stress on the magnetization of magnetite (Fe3O4) with increasing temperature and hydrostatic pressure. The responsiveness of magnetization to seismotectonic stress is gauged by an appropriate balancing of magnetocrystalline and magnetoelastic anisotropy energies. The calculations indicate that magnetite becomes progressively more responsive to stress at depth increases. The rate of change depends on the local geothermal gradient. The upper 15 km of the lithosphere is likely to be the most important in yielding observable piezomagnetic field effects. Such shallow-focus earthquakes are expected to be best for monitoring tectonomagnetic anomalies for earthquake prediction.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
Carmichael, R.S., Stress control of magnetization in magnetite and nickel and implications for rock magnetism, J. Geomag. Geoelectr., 20, 187–196, 1968.
Carmichael, R.S., Depth calculation of piezomagnetic effect for earthquake prediction, Earth Planet. Sci. Lett., 36, 309–316, 1977.
Green, A.G., Interpretation of Project MAGNET aeromagnetic profiles across Africa, Geophys. J.R. Astr. Soc., 44, 203–228, 1976.
Ispir, Y. and O. Uyar, An attempt in determining the seismomagnetic effect in N.W. Turkey, J. Geomag. Geoelectr., 23, 295–305, 1971.
Nagata, T., Application of tectonomagnetism to earthquake phenomena, Tectonophysics, 14, 263–271, 1972.
Nulman, A., V.A. Shapiro, S. Maksimovskikh, N. Ivanov, J. Kim, and R.S. Carmichael, Magnetic susceptibility of magnetite under hydrostatic pressure and implications for tectonomagnetism, IAGA General Assembly, Seattle, Aug. 1977;
Nulman, A., V.A. Shapiro, S. Maksimovskikh, N. Ivanov, J. Kim, and R.S. Carmichael, Magnetic susceptibility of magnetite under hydrostatic pressure and implications for tectonomagnetism, J. Geomag. Geoelectr., 30, 585–592, 1978.
Rikitake, T., Geomagnetism and earthquake prediction, Tectonophysics, 6, 59–68, 1968.
Yukutake, T. and H. Tachinaka, Geomagnetic variation associated with stress change within a semi-infinite elastic earth caused by a cylindrical force source, Bull. Earthq. Res. Inst., Univ. Tokyo, 45, 785–798, 1967.
Author information
Authors and Affiliations
Editor information
Rights and permissions
Copyright information
© 1979 Center for Academic Publications Japan
About this paper
Cite this paper
Carmichael, R.S. (1979). Piezomagnetic Response with Depth, Related to Tectonomagnetism as an Earthquake Precursor. In: Fuller, M., Johnston, M.J.S., Yukutake, T. (eds) Tectonomagnetics and Local Geomagnetic Field Variations. Advances in Earth and Planetary Sciences, vol 5. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-9825-0_12
Download citation
DOI: https://doi.org/10.1007/978-94-010-9825-0_12
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-9827-4
Online ISBN: 978-94-010-9825-0
eBook Packages: Springer Book Archive