Coupled with the method of the quake, the power of today's 8.6 magnitude quake was not nearly as strong. The 2004 quake was a magnitude 9.1, making it the third-most powerful earthquake ever recorded.
A tsunami watch and warning was put into effect for the Indian Ocean, immediately after the event. The power went out in Banda Aceh, where residents moved to higher ground, reported Sutopo Purwo Nugroho, a spokesman for the Indonesian National Disaster Management Agency. The island of Simeulue, Prih Harjadi and other coastal areas of Aceh were put on alert.
India also took caution on Andaman and Nicobar Islands, where authorities ordered people to move out of low-lying areas, CNN reported.
As it turned out, sea level gauges show that several islands in the region experienced a rise in sea level from tsunami waves of less than 0.2 meters (1 foot). Indeed, the highest waves recorded struck the coast of Meulaboh 12 minutes after today's earthquake, with a run-up of 1.06 meters (3.5 feet).
No additional tsunami risk followed an aftershock of magnitude 8.2 that struck at 16.4 kilometers (10 miles) deep, 617 kilometers (383 miles) south-southwest of the coast of Banda Aceh.