Recently went to look at the on-line Britannica and cancelled within 72 hours. The stuff I was researching (broadcasting) was TEN years old. If the articles I was searching were so way off base, I have no trust in the rest.
In the meantime there is already a Wiki on the Great Wave.....
The 2004 Indian Ocean earthquake struck the Indian Ocean on December 26, 2004 and caused tsunamis that killed over 150,000 people, the great majority in Indonesia, making this one of the deadliest natural disasters in modern history. The quake was an undersea megathrust earthquake of magnitude 9.0 off the western coast of northern Sumatra, Indonesia at 00:58:53 UTC (07:58:53 local time). It was the largest earthquake on Earth since the 9.2-magnitude Good Friday Earthquake which struck Alaska in 1964, and tied for fourth largest since 1900.
The tsunamis ravaged coastal regions all over the Indian Ocean, devastating parts of Indonesia, Sri Lanka, India, Thailand and other countries. The tsunamis reached heights of 15 m and flooded coastlines between fifteen minutes and ten hours after the quake. Deadly tsunamis struck as far away as Somalia and several other countries on the east coast of Africa, 4,500 km (2,800 mi) or more west of the epicentre. Global ripple effects were so widespread that wave fluctuations passed into the Pacific Ocean and caused tidal disturbances in North and South America.