More than $50 million has been promised to Japan in what will likely be the largest relief response since the 2004 Southeast Asian tsunami.

Mixed messages over nuclear threat create uncertainty and panic; some citizens flee.

Fires at Japan's Fukushima Daiichi nuclear plant have caused a run on potassium iodide tablets, one method of protection from exposure to radiation. But many are finding the tablets hard to come by.

With reports of record radiation levels in Tokyo, the government is asking city residents to stay calm. But some are fleeing to safer locations.

Dozens of cables connecting Japan to the U.S. and mainland Asia were affected by the quake.

The disaster in Japan could have a huge impact on industrial production of products like semi-conductors and other electronic components.

As the Japanese deal with the wreckage of Friday's disaster, survivors face the threat of dwindling food and fuel supplies.

Even with the scope of the disaster uncertain, its effects are already altering global energy plans. Markets react.

As the world watches the disaster in Japan unfold, Barry Scanlon, president of the emergency preparedness firm Witt Associates, explains how the U.S. would handle an earthquake similar to Japan's.

Julia Coronado, chief economist with BNP Paribas, explains how the disaster in Japan will shift global economics, and how U.S. debt becomes a "save-haven asset."