More than 226,000 killed by wave

The giant wave struck out of the blue, ravaging 13 countries in Asia and Africa.

The tsunami on Dec 26, 2004, left more than 226,000 dead, most of them in Indonesia, Sri Lanka, India, Thailand, Malaysia, Myanmar, Somalia and the Maldives.

It was triggered by a 9.1 magnitude undersea earthquake off Aceh province in Sumatra.

Today, most of the 27 nations bordering the Indian Ocean have early warning systems in place to quickly transmit information, alerting authorities of a possible tsunami, including its duration and its magnitude.

Research in this field has also been accelerated and signs for evacuation routes and shelters are up in high-risk areas.