Photo: Amar Saleem

How tall is a tsunami?

100 feet Tsunamis generally reach a maximum vertical height onshore, called a run-up height, of no more than 100 feet above sea level. A notable exception was the 1958 tsunami triggered by a landslide in a narrow bay on Alaska's coast. Its over 1,700-foot wave was the largest ever recorded for a tsunami.

pbs.org - Wave That Shook the World | Once and Future Tsunamis (non-Flash)

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3.5 Billion Years Ago

Long before Earth's landmasses looked as they do today, a 12- to 30-mile-wide meteor smacked into the ocean somewhere on the planet and started a tsunami powerful enough to inundate all land areas. Only the tallest mountains remained above water. Scientists have found remnants of the catastrophe in some of the oldest rocks on Earth—in Western Australia's Pilbara Block and in South Africa's Barberton Greenstone Belt. They are still actively searching for the enormous crater the impact would have created.

Thera, Ancient Greece, 1645 B.C.

The volcanic eruption of the ancient Greek island of Thera was among the largest in thousands of years. Thera's blast collapsed its cone, producing a tsunami often blamed for the fall of the Minoan civilization on nearby Crete. Little scientific evidence for this theory existed until recently, when geologists finally uncovered proof that the tsunami's waves were massive when they hit Crete. They would have destroyed ports, crippled the maritime economy, and led to devastating crop failures, potentially catalyzing the Minoans' decline in subsequent years. Research into Thera's tsunami is ongoing.

Cascadia Fault, January 26, 1700

Geologists recently uncovered evidence in dead trees and layers of mud and sand that a massive earthquake ruptured the entire Cascadia fault along the west coast of the U.S. in 1700. They believe a tsunami formed there and rippled across the Pacific, reaching Hawaii, Japan, and even Australia. Indeed, records from Japan describe a powerful "orphan" tsunami on that day whose earthquake was not felt. The Cascadia fault has experienced at least seven quakes in the last 3,500 years, all of them between 300 and 1,000 years apart. It has been 305 years since the last event, and experts say the next one could occur at any time.

Krakatoa, Indonesia, August 27, 1883

After 300 years of dormancy, the small volcanic island of Krakatoa between Java and Sumatra erupted and collapsed in 1883, killing more than 36,000 people. Most victims died from the enormous tsunami the blast unleashed. Mountains of seawater more than 140 feet high and carrying 600-ton blocks of coral wiped out dozens of villages along the coast of Java and Sumatra. The economy of the region was disrupted for hundreds of miles. Krakatoa produced the first tsunami recorded and studied globally by scientists and, as one of the most destructive tsunamis in history, it continues to serve as a valuable example for tsunami experts.

Aleutian Islands, Alaska, April 1, 1946

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For almost 60 years, the leading theory about this tsunami claimed that a powerful underwater earthquake triggered it. But a seafloor-mapping project recently conducted at the Scripps Institution of Oceanography found no evidence to support this idea, forcing experts to rethink their theory. They are trying to determine what event could have produced the wave's devastating force, allowing it to pummel Hawaii with 60-foot waters more than five hours after it did its first damage in Alaska, where local surges rose to 138 feet. The tsunami killed 123 people and cost millions of dollars in damages.

Lituya Bay, Alaska, July 9, 1958

Tsunamis generally reach a maximum vertical height onshore, called a run-up height, of no more than 100 feet above sea level. A notable exception was the 1958 tsunami triggered by a landslide in a narrow bay on Alaska's coast. Its over 1,700-foot wave was the largest ever recorded for a tsunami. It inundated five square miles of land and cleared hundreds of thousands of trees. Remarkably, only two fatalities occurred. In the wake of the Lituya tsunami, scientists realized for the first time that a landslide—90 million tons of rock in the case of Lituya—could produce a giant wave.

Valdivia, Chile, May 22, 1960

The largest earthquake ever measured, a 9.5, started a series of tsunamis in the Pacific Ocean that devastated Hawaii. The waves even reached Japan, 10,000 miles away from the epicenter, where they took 122 of the approximately 5,000 total lives lost. The Chilean tsunami taught experts two important lessons: that an earthquake felt on land can warn of a tsunami, as can a rapid rise or fall of coastal waters. After the 1960 wave, the Pacific Tsunami Warning Center was linked to an international data and warning network for the first time. It uses hundreds of seismic stations worldwide to assess tsunami risks in the Pacific, where most occur.

Indian Ocean, December 26, 2004

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With over 250,000 people dead or missing, the 2004 tsunami was one of the most catastrophic natural disasters in modern times. A magnitude 9.0 earthquake in the seafloor more than 18 miles below the Indian Ocean's surface caused the wave. It released enough energy, scientists estimate, to boil 40 gallons of water for every person on Earth. None of the countries most severely affected had a tsunami warning mechanism to alert people of the impending wave, and since tsunamis are rare in the Indian Ocean, local people did not know to flee inland after a tremor. Experts around the world are now looking at ways to prevent a similar future catastrophe.

Canary Islands, Future

One group of scientists believes that conditions are ideal for a tsunami-producing landslide on the island of La Palma in the Canaries. The western flank of the island's active volcano has the potential to give way in a future eruption. If it did, a huge mass of rock weighing 500,000 million tons would fall into the Atlantic Ocean. Experts in Switzerland have simulated the potential effects of such a collapse. Their model shows that it could generate a wave capable of engulfing every port on the east coast of the U.S., which they believe may have happened during a similar tsunami 120,000 years ago.

pbs.org - Wave That Shook the World | Once and Future Tsunamis (non-Flash)

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