The 2004 Indian Ocean Earthquake & Tsunami: Catastrophe Unfolded

On December 26, 2004, 07:58:53 UTC+7, a Mw 9.1–9.3 megathrust earthquake ruptured a 1,200-km segment of the Sunda Trench off northern Sumatra (Burma Plate subducting under Indian Plate).

Tsunami Generation & Impact

• Vertical seafloor displacement (up to 10–20 m) displaced massive water volume.
• Waves radiated at jet speed (700 km/h), reaching coasts in 15 min (Sumatra) to 7 hrs (East Africa).
• Run-up heights: 10–30 m (33–100 ft) in Aceh; 5–10 m in Thailand, Sri Lanka, India.
• Death toll: ~230,000 across 14 countries (Aceh: ~167,000).
• Displaced: ~1.7 million; entire communities erased.

Timeline

1. 07:58: Quake strikes.
2. 08:00–10:00: Tsunamis hit Indonesia, Thailand, Sri Lanka, India, Maldives, Malaysia, Myanmar, Bangladesh, East Africa.
3. Dec 26–27: Devastation realized; Aceh isolated.
4. Dec 28: International aid mobilizes.
5. Jan 2, 2005: UN launches $977M appeal.
6. Jan 11: Aceh toll >167,000 confirmed.
7. Feb 15: Final toll ~230,210.
8. Mar 26: Jakarta reconstruction conference.
9. May 26: World Bank pledges $1.3B.

Legacy

Spurred Indian Ocean Tsunami Warning System (IOTWS), improved building codes, coastal zone management, and disaster preparedness globally. A watershed in humanitarian response.