2004 Indian Ocean earthquake and tsunami
A magnitude 9.1 earthquake ruptured the Sunda megathrust off Sumatra's west coast at about 30 km depth. The seafloor rupture sent tsunami waves up to 30 meters high across 14 countries.
Nearly 230,000 people died, most in Indonesia's Aceh province.
The disaster spurred the Indian Ocean Tsunami Warning System and Indonesia's InaTEWS.
The 2026 quake is in the same subduction zone but 175 km deep and under land, so BMKG ruled out a tsunami within hours.
