What did the Indian Ocean earthquake 2004 measure on the Richter scale?

The Indian ocean earthquake of 2004 measured 9.1 to 9.3 on the moment magnitude scale, which is a more accurate scale for measuring large earthquakes than the Richter scale. Occurring on December 26, 2004, it was one of the most powerful earthquakes recorded in history. The earthquake generated a massive tsunami that affected several countries around the Indian Ocean, resulting in significant loss of life and widespread destruction.