Description
The earthquake occurred along a yet-undiscovered extension of the Kego fault in the Sea of Genkai. Genkai island, a part of western district was the most severely damaged area and almost all island residents were forced to evacuate. One person was killed, 70 people were severely injured and 1,017 received attention for minor injuries. Aftershocks continued intermittently throughout the following weeks as construction crews worked to rebuild damaged buildings throughout the city. Traditional Japanese houses, particularly in the areas of Daimyō and Imaizumi, were the most heavily damaged and many were marked for demolition. Insurance payments for damages were estimated at approximately 15.8 billion yen.
Fukuoka's most famous major fault, the Kego fault, runs northwest to southeast, roughly parallel to Nishitetsu's Ōmuta train line, and was thought to be 22 km long, terminating at Hakata Bay. It is estimated to be able to produce earthquakes as strong as magnitude 7 at the epicenter approximately once every 15,000 years. When a center is located at a depth of 10 km, it would cause an earthquake of a lower-6 magnitude (similar to the March 20, 2005 earthquake) in downtown Fukuoka. 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. According to a National Institute of Advanced Industrial Science and Technology presentation April 12, 2005, supposing the last Kego earthquake had occurred 13,000 years ago, the probability of major activity within 30 years had been revised to 7%, or it were 7,000 years ago, the probability had been revised to 4%. Suppose that an earthquake had occurred along the Kego fault within the last 2000 years, the risk would be unchanged.
Read more about this topic: 2005 Fukuoka Earthquake
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