b-value method
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Area of 0.3° × 0.3° containing a part of the source zone of the Kumamoto mainshock
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Unknown
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RTM-algorithm
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Area of 2° × 3° between the Kumamoto and Off Satsuma Peninsula mainshocks
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1.5 years for the Kumamoto mainshock (1 year for the Off Satsuma Peninsula mainshock)
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Z-value method
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Area with R = 100 km between the Kumamoto and Off Satsuma Peninsula mainshocks
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1.5 years for the Kumamoto mainshock (1 year for the Off Satsuma Peninsula mainshock)
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Seismicity density analysis
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Area with Δr = 8–40 km containing a part of the source zone of the Kumamoto mainshock
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3 years or longer for the Kumamoto mainshock
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