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From Russian site - Tsunami physics (not specific to recent one)
The phenomenon we call a tsunami is a series of extremely long waves with long period. These waves are primarily associated with earthquakes occurred under oceanic bottom or near coast. Volcanic eruptions, landslides, nuclear explosions and even outer space objects impacts can also generate tsunami. In the deep ocean tsunami speed can exceed 1000 km/hr , tsunami length from crest to crest may be a hundred kilometers or more while height may be only a few centimeters so people aboard cannot feel them.
When the tsunami enters the shoal parts of coastline, wave velocity rapidly diminishes and the wave height considerably increases. Just in these shallow waters tsunami becomes dangerous for life and property, its height may be from 30 up to 50 m or even more and tsunami strike becomes devastating. Tsunami is most dangerous for settlements situated inside V-shaped gulfs and bays when open part looks towards the ocean. In Kuril Isls 2-nd Kuril Strait (where Severo-Kurilsk is situated ) is similar to such bay. Great amount of water enters such bay striking coast and flooding rivers up to 2-3 km from coastline.
The phenomenon we call a tsunami is a series of extremely long waves with long period. These waves are primarily associated with earthquakes occurred under oceanic bottom or near coast. Volcanic eruptions, landslides, nuclear explosions and even outer space objects impacts can also generate tsunami. In the deep ocean tsunami speed can exceed 1000 km/hr , tsunami length from crest to crest may be a hundred kilometers or more while height may be only a few centimeters so people aboard cannot feel them.
When the tsunami enters the shoal parts of coastline, wave velocity rapidly diminishes and the wave height considerably increases. Just in these shallow waters tsunami becomes dangerous for life and property, its height may be from 30 up to 50 m or even more and tsunami strike becomes devastating. Tsunami is most dangerous for settlements situated inside V-shaped gulfs and bays when open part looks towards the ocean. In Kuril Isls 2-nd Kuril Strait (where Severo-Kurilsk is situated ) is similar to such bay. Great amount of water enters such bay striking coast and flooding rivers up to 2-3 km from coastline.