What would happen if two tsunamis collide?

The waves would continue on their paths with some amount of addition or subtraction. Sometimes large incoming shore waves will produce a significant backwash wave. Where the water is shallow the backwash wave adds to another incoming wave to produce a bigger wave but in deeper water they simply pass through each other.

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Regarding this, what does a tsunami look like underwater?

Has the US ever had a tsunami? Large tsunamis have occurred in the United States and will undoubtedly occur again. Significant earthquakes around the Pacific rim have generated tsunamis that struck Hawaii, Alaska, and the U.S. west coast. The most noteworthy tsunami resulted from the 1929 magnitude 7.3 Grand Banks earthquake near Newfoundland.

One may also ask has a mega tsunami ever happened?

On, Alaska's Lituya Bay was hit by the largest megatsunami ever recorded. It occurred when a 7.8 magnitude earthquake struck the Fairweather fault, dislodging 90 million tons of rock into the bay. 4 days ago Do tsunamis hit Hawaii? Tsunamis are a series of very dangerous, large, long ocean waves. Since 1946, more than 220 people have died in the State of Hawaii, including six on Oahu, due to tsunamis.

Could a tsunami hit New York?

First of all, a tsunami will not hit NY because there are no active crustal plates in that area of the Atlantic. However, New York is very vulnerable to sea rise and there are quite a few studies that estimate the effects of sea rise on the city.