In the deadliest tsunami in history the indian ocean tsunami of 2004 was generated by

The cause of the 2004 tsunami was an earthquake.

Explanation:

It was an earthquake of 9.0 magnitude with an epicenter in the Indian Ocean near the coast of Sumatra which became the reason for a devastating tsunami in 2004.The movement of the tectonic plated displaced a huge amount of water and sent strong shock waves across the ocean, which affected the coastlines of 11 countries and resulted in more than 200,000 victims.

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