The Sunda Trench is a known subduction zone with a history of generating large earthquakes. The timing of the waves, arriving just before high tide in many places, further increased the inland penetration and the sheer volume of destruction.
2004 Thailand Tsunami Earthquake Cause: The Sunda Trench Megathrust
This megathrust event occurred along the Sunda Trench, where the Indian Plate dives beneath the Burma Plate. For Thailand, situated on the Andaman Sea coast, this energy arrived within minutes, making effective warning systems critically important.
Tectonic Setting of the Andaman Sea The geography of the Andaman Sea and the orientation of the coastline played a significant role in amplifying the impact. Resorts and villages in areas like Khao Lak and Phuket were directly in the path of these waves, which climbed over beaches and low-lying coastal land with little natural barrier to stop them.
The 2004 Earthquake and Sunda Trench Megathrust Behind the Thailand Tsunami
Warning Systems and Human Factors At the time of the disaster, Thailand had no advanced tsunami warning infrastructure in place. Long-Term Geological Context While the 2004 event was rare in its magnitude, it was not entirely unexpected by geologists.
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