Plate Tectonics and Energy Release The Earth's lithosphere is broken into tectonic plates that float on the semi-fluid asthenosphere below. The Seismic Trigger: The Sumatra-Andaman Earthquake The genesis of the 2004 tsunami was a megathrust earthquake with a magnitude estimated between 9.
Why the 2004 Tsunami Warning System Failed to Protect Lives
The rupture occurred along the Sunda Megathrust, a massive fault line where the Indian Plate is forced beneath the Burma Plate. While ordinary wind-driven ocean waves have wavelengths of about 100 meters, the waves generated by this earthquake had wavelengths exceeding 200 kilometers.
Upon reaching the shore, the waves did not simply retreat back into the ocean after the first impact. Unlike typical strike-slip earthquakes that slide horizontally, this event involved a violent vertical displacement of the seafloor, pushing a massive column of water upward.
Why the 2004 Tsunami Warning System Failed to Protect Lives
However, as these waves traveled across the Indian Ocean at speeds exceeding 800 kilometers per hour, they carried an enormous amount of kinetic energy. The sheer scale of the event left entire communities obliterated and claimed over 230,000 lives across 14 countries.
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