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The bombs detonated about 6 km (3.7 mi; 3.2 nmi) from the nearest island, where the waves were no higher than 3 to 4 m (9.8 to 13.1 ft) when they reached the shoreline. Other underwater tests, mainly Operation Hardtack I /Wahoo in deep water and Operation Hardtack I/Umbrella in shallow water, confirmed the results.
A megatsunami had a run-up of at least 16 metres (52 ft) and traveled between 1.5 and 3.5 km (0.9 and 2.2 mi) inland from the ancient Eastern Mediterranean coast. [23] ≈7000–6000 BCE: Lisbon, Portugal: Unknown: A series of giant rocks and cobblestones have been found 14 metres (46 ft) above mean sea level near Guincho Beach. [24] ≈6370 BCE
Rupture velocities for tsunami earthquakes are typically about 1.0 km per second, compared to the more normal 2.5–3.5 km per second for other megathrust earthquakes. These slow rupture speeds lead to greater directivity, with the potential to cause higher run-ups on short coastal sections.
Large tsunamis have occurred in the US and will again. A magnitude 9.2 earthquake in the Gulf of Alaska caused damage and loss of life along the West Coast in 1964. More than 150 tsunamis have ...
The Lituya Bay megatsunami caused damage at higher elevations than any other tsunami, being powerful enough to push water up the tree covered slopes of the fjord with enough force to clear trees to a reported height of 524 m (1,719 ft). [9] A 1:675 recreation of the tsunami found the wave crest was 150 m (490 ft) tall. [14]
It said Monday’s major tsunami warning for Ishikawa was the first time this level of alert had been issued since March 2011, when a massive earthquake measuring over 9 on the richter scale ...
[2] [3] [4] Initially it was unclear if the landslide was caused by a small earthquake (magnitude 4), [2] [5] but later it was confirmed that the landslide had caused the tremors. [3] The tsunami had an initial height of 90 to 100 m (295 to 328 ft), but it was significantly lower once it hit the settlement, where it had a run-up height of 9 ...
On the island of South Pagai, the tsunami reached a height of 3 m (9 ft) and swept as far as 600 m (1800 ft) inland. A maximum run-up of 16.86 m (55.3 ft) at Sibigau Island. [13] According to Indonesian officials, more than 20 villages were hit by the tsunami, displacing more than 20,000 people [12] and