Long-Range Anomalous Electromagnetic Effect Related to M9 Great Tohoku Earthquake
Earth Sciences
Volume 4, Issue 1, February 2015, Pages: 31-38
Received: Jan. 7, 2015; Accepted: Jan. 14, 2015; Published: Jan. 26, 2015
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Dragos Armand Stanica, Department of Electromagnetism and Lithosphere Dynamics, Institute of Geodynamics of the Romanian Academy, Bucharest, Romania
Dumitru Stanica, Department of Electromagnetism and Lithosphere Dynamics, Institute of Geodynamics of the Romanian Academy, Bucharest, Romania
Nicoleta Vladimirescu, Department of Electromagnetism and Lithosphere Dynamics, Institute of Geodynamics of the Romanian Academy, Bucharest, Romania
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It is supposed that prior to a large earthquake its focus may send through the Earth lithosphere a long-range effect of strain-related to transient electric signals, which in turn give rise to geomagnetic variations propagated over a wide range of frequencies. Consequently, to confirm long-range electromagnetic anomalous effect related to the M9 Great Tohoku earthquake occurred on 11 March 2011, we retrospectively analyzed the geomagnetic data collected at three observatories placed in Japan (Memambetsu, Kakioka) and Romania (Provita de Sus). The daily mean distributions of the normalized function Bzn and its standard deviation (STDEV) for all the three observatories are performed in the ultra-low frequency range (0.001-0.016Hz) by using the FFT band-pass filter analysis. Additionally, a comparative statistical analysis, based on a standardized random variable equation, was applied to the Bzn time series to emphasize a possible pre-seismic anomalous interval and, consequently, a peak greater than 2.5∙STDEV, related to the M9 Tohoku earthquake, was identified on 5-6 February 2011. The lead time was 32 days before the earthquake occurrence. The final conclusion is that the detection area of the pre-seismic electromagnetic effect could be extended to the considerable distances from the epicenter of a giant earthquake.
Pre-Seismic Anomalous Bzn, Crustal Electrical Conductivity Changes, M9 Tohoku Earthquake
To cite this article
Dragos Armand Stanica, Dumitru Stanica, Nicoleta Vladimirescu, Long-Range Anomalous Electromagnetic Effect Related to M9 Great Tohoku Earthquake, Earth Sciences. Vol. 4, No. 1, 2015, pp. 31-38. doi: 10.11648/j.earth.20150401.13
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