Potential Mw8.1-or-above Japan earthquake around 4 May 2030 numerically predicted via addition-subtraction frequency method

Japan is located in Pacific volcanic seismic belt, and lies at the junction of the Pacific plate and the Eurasian plate. This makes Japan one of the most seismically active regions in the world. Earthquake prediction, and especially huge earthquake prediction for Japan is necessary to take disaster preparedness and mitigation measures. In this paper, addition-subtraction frequency (ASF) method with three inputs is presented for predicting a potential Mw8.1-or-above earthquake in Japan after year 2020. The date data of earthquakes which this paper uses are Japan's real seismic data in the past. Meanwhile, three forms of initial date data [i.e., m/d/y (month/day/year), m/y (month/year), and y (year)] are used as the inputs of numerical experiments. Thus, possible occurrence dates of Mw8.1-or-above earthquakes in Japan can be identified via ASF method. Finally, via consistency analysis of these possible dates, the date 4 May 2030 is the one with the highest possibility.