People rescued from collapsed houses and other buildings Saturday described the terror they felt after barely escaping Kumamoto's second deadly quake in less than 48 hours.

"The house started to shake, so I grabbed my cell phone and was about to run when it came down," said Fumio Iwamoto, 54, who managed to survive in a small pocket of rubble that used to be his two-story home in Minami Ward.

Iwamoto was sleeping on the ground floor when the magnitude-7.3 quake hit but was extracted by rescue workers roughly 30 minutes later.