The geological triggers behind waves that can wipe out islands
In short: While standard tsunamis are usually earthquake-driven, mega tsunamis are born from more extreme geological failures. This video explores the mechanics of these half-kilometer-high waves and identifies which coastal regions face the highest risk of total destruction.
Mega tsunamis are distinguished from common tsunamis by their scale and origin. While typical waves result from underwater earthquakes, mega tsunamis are primarily triggered by massive underwater landslides. These occur when geological instability on underwater slopes—caused by volcanic activity, earthquakes, or the slow buildup of sediment—causes large portions of land to collapse into the ocean.
The resulting shock wave propagates at high speeds, creating waves that can reach heights of half a kilometer. Because of their intensity, these events have the power to destroy entire cities or completely erase islands from the map, historically leading to the collapse of civilizations.
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- Summary by Intellect · source: MEGA TSUNAMIS! Which Cities Are Most Vulnerable?
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