2017/04/24 by E. S. Skordas, Skordas, E. S.
Earth and Planetary Sciences · Economics, Econometrics and Finance · #Complex Systems and Time Series Analysis #Earthquake Detection and Analysis #FOS: Physical sciences #Geophysics (physics.geo-ph)
paper · pdf · doi:10.48550/arxiv.1704.07134
openalex publication_date 2017/04/24 · openalex created_date 2017/05/05 · openalex updated_date 2026/07/28
Applying Detrended Fluctuation Analysis (DFA) to the geomagnetic data recorded at three measuring stations in Japan, Rong et al. in 2012 reported that anomalous magnetic field variations were identified well before the occurrence of the disastrous Tohoku Mw9.0 earthquake that occurred on 11 March 2011 in Japan exhibiting increased "non-uniform" scaling behavior. Here, we provide an explanation for the appearance of this increase of "non-uniform" scaling on the following grounds: These magnetic field variations are the ones that accompany the electric field variations termed Seismic Electric Signals (SES) activity which have been repeatedly reported that precede major earthquakes. DFA as well as multifractal DFA reveal that the latter electric field variations exhibit scaling behavior as shown by analyzing SES activities observed before major earthquakes in Greece. Hence, when these variations are superimposed on a background of pseudosinusoidal trend, their long range correlation properties -quantified by DFA- are affected resulting in an increase of the "non-uniform" scaling behavior. The same is expected to hold for the former magnetic field variations.