This is an abstract of the lecture proposed for the IOC Roger Revelle Lecture 2024.

Emile A. Okal, Northwestern University, Evanston, IL 60208 USA

It has now been close to 20 years since the 2004 Sumatra disaster, which made "tsunami" a
household word, and was probably the most lethal such event in the history of mankind. As a
result, a worldwide emphasis has been given to tsunami risk mitigation, and we will review our progress in several areas. [...]