Skip to main content

Table 1 Characteristic precursory phenomena

From: Seismicity prior to the 2016 Kumamoto earthquakes

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