In seismology, a tsunami earthquake is an earthquake which triggers a tsunami of significantly greater magnitude, as measured by shorter-period seismic waves. The term was introduced …

November 1, 1755, Lisbon, Portugal - A magnitude 8.5 (estimated) earthquake in the Atlantic Ocean generated a tsunami that affected the coasts of Portugal, Spain, North Africa, and the …

A tsunami triggered by an earthquake along the AASZ would cross the Pacific Ocean and cause extensive damage along highly populated U.S. coasts, with ports being...

Dec 6, 2024 · About 80% of all known tsunamis are triggered by earthquakes. These seismic events move Earth's surface, displacing the water above and generating waves that rapidly …

Dec 26, 2024 · Tsunami, catastrophic ocean wave usually caused by a submarine earthquake, by a landslide, or by a volcanic eruption. In deep water it travels as fast as 800 km (500 miles) per …

On July 29, 2021, a magnitude 8.2 Mw Chignik earthquake hit the southeast of Perryville, Alaska, south of the Alaska Peninsula (55.325 N 157.841 W depth=32 km) at 06:15 Universal Time …

A tsunami is a series of waves caused by earthquakes or undersea volcanic eruptions. On September 29, 2009, a tsunami caused substantial damage and loss of life in American …

Jul 15, 2020 · Learn about the earthquakes that triggered recent tsunami events, and watch computer simulations of each tsunami from different angles. Background information and links …

Mar 27, 2013 · In most cases, the first sign of a potential tsunami is an earthquake. Seismic waves travel about 100 times faster than tsunamis, so information about an earthquake is …

Apr 2, 2007 · National Geographic News looks at how the killer waves are caused, what the warning signs are, and how to respond when a tsunami threatens. A tsunami is a series of …