2004 Indian Ocean earthquake and tsunami

The 2004 Indian Ocean earthquake and tsunami was a major natural disaster that began with a powerful undersea earthquake off northern Sumatra, Indonesia, on 26 December 2004.

The 2004 Indian Ocean earthquake and tsunami was a major natural disaster that began with a powerful undersea earthquake off northern Sumatra, Indonesia, on 26 December 2004. It generated a tsunami that affected coastlines across the Indian Ocean and caused enormous loss of life and destruction in multiple countries. The disaster is widely regarded as the deadliest tsunami in recorded history.

Earthquake and tsunami

The earthquake, commonly referred to as the Sumatra–Andaman earthquake, occurred on 26 December 2004 off the west coast of northern Sumatra, Indonesia. It was an undersea megathrust earthquake with an estimated magnitude of about 9.1 to 9.3. The seafloor displacement generated a tsunami that spread across the Indian Ocean basin. In some areas, waves reached heights of up to 30 metres.

Impact across the Indian Ocean

The tsunami affected coastlines in at least 14 to 15 countries. Indonesia, Sri Lanka, India, and Thailand were among the hardest-hit areas. Death toll estimates vary, but commonly cited figures range from about 227,898 to more than 230,000 people killed or missing and presumed dead. The tsunami is widely described as the deadliest in recorded history.

Humanitarian response

The disaster prompted a major international relief effort, with Canadian aid agencies, government programs, and donors participating in relief and recovery. The event also renewed attention to tsunami warning systems and global disaster preparedness initiatives.

Legacy

The 2004 Indian Ocean earthquake and tsunami remains one of the deadliest natural disasters in recorded history. It had a lasting influence on coastal risk awareness and emergency management, prompting improvements in early warning systems and international coordination.