From Guardian:
Countries across the Pacific from Indonesia to Peru are bracing for the arrival of a series of tsunamis triggered by the largest earthquake in Japan's recorded history, with the Pacific islands at greatest risk.
Dozens of countries are on alert – including the entire west coast of the United States and Canada – as experts warn that the waves could wash right over islands in their path.
Tsunami warnings are in place for countries including the Philippines, Indonesia, Papua New Guinea, Australia, New Zealand, Fiji, Mexico, Guatemala, El Salvador, Costa Rica, Nicaragua, Panama, Honduras, Chile, Ecuador and Columbia.
Authorities are evacuating tens of thousands of people from vulnerable areas.
The largest waves are headed south-west from Japan at about 500mph and could cross the Pacific basin in 24 hours. There have been waves from four to seven metres high crashing into the Japanese coast.
Yikes indeed.
EDIT: a good Twitter feed:
http://twitter.com/W7VOA