Kumamoto - A powerful earthquake that registered the maximum seismic intensity of 7 in Kumamoto Prefecture on July 28 caused stone walls to collapse at 28 locations within Kumamoto Castle, reviving painful memories among residents who experienced the devastating earthquakes a decade ago. The damage was visible from Ninomaru Square at the castle in Kumamoto City's Chuo Ward, where sections of stonework had fallen following the latest quake. Kumamoto city officials said collapses had been confirmed at 28 locations throughout the castle grounds. A man in his 70s who was walking through the square said the shaking brought back the fear he felt during the Kumamoto earthquakes 10 years earlier. Restoration work at Kumamoto Castle has continued since the earlier disaster, and the latest quake has struck while parts of the historic site remain under reconstruction.