Edit: After half day, my wife’s Mac started having the same problem. I have then applied the solution that I found in the Apple
Early earthquake warning notifications included in IOS5 for Japan
After the recent devestating earthquake in Japan , Apple has decided to add a early earthquake warning notification option in iOS 5. iOS 5 users in Japan can turn on early earthquake notifications at the very bottom of the iOS 5 Notification Center settings pane in there settings. The system apperently gives warnings from seconds to one or two minutes before the earthquake hits. Time explains the history of the system:
Japan has the most advanced earthquake early-warning system in the world. A nationwide online system launched in 2007, it detects tremors, calculates an earthquake’s epicenter and sends out brief warnings from its 1,000-plus seismographs scattered throughout the country, one of the most earthquake-prone nations on the planet.
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