was uncovered. The teams also discovered a new fault in the Higashi-ku portion of Hakata Bay. Later findings indicated that the fault responsible for both the March 20 and April 20 quakes was likely an extension of the Kego fault, making its total length approximately 40 km. Aftershocks After the main shock of the Fukuoka earthquake, several smaller aftershocks happened around the source. By 9 p.m. Tuesday, 85 aftershocks had been recorded. Within a month of the quake, there were four aftershocks with a magnitude of more than 5, including the largest one of M5.8 on April 20. Within half a year the size of aftershocks continued, a total of several thousand times, but the overall trend gradually reduced. Effects of Earthquake Architecture During this earthquake, more than half of the 225 residential buildings on the Genkai Island in the western part of Fukuoka city, near the epicenter, suffered serious damage. The island was particularly hard hit because it near to the quake and traditional Japanese homes are less vulnerable to earthquakes than "mansions" that are built by engineers. In Kaido, about 120 homes were destroyed and another 55 damaged partially. 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 damage were estimated at approximately 15.8 billion yen. In Tenjin, many windows were smashed and concrete cracked. Temples and shrines were also damaged a lot. More than half of the 225 residential buildings on the Genkai Island in the western part of Fukuoka city, near the epicenter, suffered serious damage Transportation According to public broadcaster NHK, local rail services were suspended after the tremors triggered an automatic safety mechanism. The operation of the San'yō Shinkansen between Shin-Yamaguchi and Hakata was temporarily suspended. The cracks appeared on sidewalks in residential areas. Other Effects Officials reported water and gas breaks and power outages. Telephone service in the southern prefecture was jammed after an automatic safety mechanism was triggered by the tremors. The quake also caused 103 gas leaks. The meteorological agency issued a tsunami warning after the strong earthquake, but lifted it at noon. Landslides occurred around Fukuoka, Saga and Nagasaki prefectures. The impact on Other Countries Kyushu, which is separated from South Korea by a narrow strait, was felt about 130 miles from the South Korean port city of Busan, where it briefly shook buildings.