Articles | Volume 21, issue 6
Nat. Hazards Earth Syst. Sci., 21, 1785–1806, 2021
https://doi.org/10.5194/nhess-21-1785-2021
Nat. Hazards Earth Syst. Sci., 21, 1785–1806, 2021
https://doi.org/10.5194/nhess-21-1785-2021

Research article 11 Jun 2021

Research article | 11 Jun 2021

Long-term magnetic anomalies and their possible relationship to the latest greater Chilean earthquakes in the context of the seismo-electromagnetic theory

Enrique Guillermo Cordaro et al.

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Cited articles

Abad, M., Izquierdo, T., Cáceres, M., Bernárdez, E., and Rodriguez-Vidal, J.: Coastal boulder deposit as evidence of an ocean-wide prehistoric tsunami originated on the Atacama Desert coast (northern Chile), Sedimentology, 67, 1505–1528, https://doi.org/10.1111/sed.12570, 2020. 
Anastasiadis, C., Triantis, D., Stavrakas, I., and Vallianatos, F.: Pressure Stimulated Currents (PSC) in marble samples, Ann. Geophys., 47, 21–28, https://doi.org/10.4401/ag-3255, 2004. 
Balasis, G. and Mandea, M.: Can electromagnetic disturbances related to the recent great earthquakes be detected by satellite magnetometers?, Tectonophysics, 431, 173–195, https://doi.org/10.1016/j.tecto.2006.05.038, 2007. 
Bedford, J. R., Moreno, M., Deng, Z., Oncken, O., Schurr, B., John, T., Báez, J. C., and Bevis, M.: Months-long thousand-kilometre-scale wobbling before great subduction earthquakes, Nature, 580, 628–635, https://doi.org/10.1038/s41586-020-2212-1, 2020. 
Blagoveshchensky, D. V., Maltseva, O. A., and Sergeeva, M. A.: Impact of magnetic storms on the global TEC distribution, Ann. Geophys., 36, 1057–1071, https://doi.org/10.5194/angeo-36-1057-2018, 2018. 
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Short summary
We developed a methodology that generates free externally disturbed magnetic variations in ground magnetometers close to the Chilean convergent margin. Spectral analysis (~ mHz) and magnetic anomalies increased prior to large Chilean earthquakes (Maule 2010, Mw 8.8; Iquique 2014, Mw 8.2; Illapel 2015, Mw 8.3). These findings relate to microcracks within the lithosphere due to stress state changes. This physical evidence should be thought of as a last stage of the earthquake preparation process.
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