 It is estimated to produce earthquakes as strong as magnitude 7 at the focus approximately once every 15,000 years.If the focus were located at a depth of , this would translate to an earthquake of a lower-6 magnitude (similar to the March 20, 2005 earthquake) in downtown Fukuoka if it were the epicenter.The probability of an earthquake along the known length of the Kego fault occurring within 30 years was estimated at 0.4% prior to the March 20, 2005 earthquake, but this probability has been revised upwards since.