What is the longest earthquake?

The Sumatran-Andaman earthquake on December 26, 2004, is the longest lasting earthquake ever recorded. The continuous shaking lasted from 500 to 600 seconds, or about 10 minutes.

The Sumatran-Andaman earthquake, which had a magnitude of 9.1 to 9.3, occurred at the bottom of the Indian Ocean in the subduction zone between the Indo-Australian and Eurasian tectonic plates. The earthquake created a fault rupture over 750 miles long. The Eurasian plate heaved an average of 33 feet over top of the Indo-Australian plate.

The earthquake caused a major tsunami that killed more than 131,000 and displaced upwards of 500,000 people. The Aceh Province of Sumatra was the worst struck.