What is a tsunami earthquake?
Quick Answer
A tsunami earthquake is a quake that produces unusually large tsunami waves compared with how strongly it shakes nearby land. These events can be hard to warn for because the shaking may seem modest.
The Full Story
Tsunami earthquakes usually rupture slowly along a fault and can generate much more seafloor displacement than their surface shaking suggests. Because the motion is relatively slow, people near the epicenter may not feel a very intense quake, yet a destructive tsunami can still form. The 1992 Nicaragua earthquake is a well-known example. These events are especially dangerous because the apparent mild shaking may not trigger immediate alarm, while the ocean response is severe. Improved tsunami warning systems and public education are important defenses against them.
Key Facts
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"The earthquake that feels small but makes a huge wave"
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