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A characteristic change of seismicity has been recently uncovered when theprecursory Seismic Electric Signals activities initiate before an earthquakeoccurrence. In particular, the fluctuations of the order parameter ofseismicity exhibit a simultaneous distinct minimum upon analyzing the seismiccatalogue in a new time domain termed natural time and employing a slidingnatural time window comprising a number of events that would occur in a fewmonths. Here, we focus on the minima preceding all earthquakes of magnitude 8(and 9) class that occurred in Japanese area from 1 January 1984 to 11 March2011 (the day of the M9 Tohoku earthquake). By applying Detrended FluctuationAnalysis to the earthquake magnitude time series, we find that each of theseminima is preceded as well as followed by characteristic changes of temporalcorrelations between earthquake magnitudes. In particular, we identify thefollowing three main features. The minima are observed during periods when longrange correlations have been developed, but they are preceded by a stage inwhich an evident anti-correlated behavior appears. After the minima, the longrange correlations break down to an almost random behavior turning toanti-correlation. The minima that precede M$\geq$7.8 earthquakes aredistinguished from other minima which are either non-precursory or followed bysmaller earthquakes.

Temporal correlations between the earthquake magnitudes before major mainshocks in Japan