The magnitude 9.1 Great Sumatra-Andaman Earthquake of December 26, 2004, spawned the deadliest tsunami in history, killing more than 230,000 people in 14 countries around the Indian Ocean.
NOVA explores what happened and why when the December 26, 2004, tsunami developed off the Sumatran coast.
Students calculate approximate speeds and travel times for sample tsunamis.
This animation shows why this south-to-north rupture is important for understanding the behavior of this tsunami, and why such "progressive" rupture needs to be considered for future tsunami forecasting.