However, the recurrence interval for such events is long, which can lead to complacency in regions that have not experienced a major tsunami in living memory. The Sunda Trench is a known subduction zone with a history of generating large earthquakes.
Exploring the Cause of the 2004 Thailand Tsunami
Some areas, particularly those with offshore coral reefs or natural headlands, experienced slightly reduced wave energy. Wave Propagation and Coastal Impact As the initial waves reached the shallow continental shelf, they began to slow down and increase in height, transforming from long ocean swells into towering walls of water.
The absence of sea-level monitoring stations and public alert systems meant that many people had only minutes—or mere seconds—between the strong ground shaking and the arrival of the waves. Understanding what caused the tsunami in Thailand requires looking at the specific geological event, the local geography, and the broader tectonic forces at play that turned a powerful quake into a deadly wall of water.
What Caused the 2004 Thailand Tsunami: The Underlying Trigger
The sudden vertical displacement of the seafloor displaced a massive volume of water, creating a series of waves that radiated across the ocean at high speed. The timing of the waves, arriving just before high tide in many places, further increased the inland penetration and the sheer volume of destruction.
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