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Nailsy
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Can anyone explain to me how an approaching tsunami would cause a dramatic fall in sea level before it comes ashore.
dem45133 said:Not to degrade the tragedy of it, but if thousands of people noticed the massive recession (6th grade science says a tidal wave is approaching...), why didn't they all head inland? I supposed the few that did notice and say something would have been ignored.
http://www.spacedaily.com/news/tectonics-04zf.htmldem45133 said:if thousands of people noticed the massive recession (6th grade science says a tidal wave is approaching...), why didn't they all head inland?
A tsunami is a series of large waves caused by a sudden and violent disturbance in the ocean floor, such as an earthquake, volcanic eruption, or underwater landslide. This disturbance displaces a large volume of water, which then travels as a series of waves towards the shore.
Yes, a tsunami can cause a dramatic fall in sea level before the waves reach the shore. This is known as a "drawback" and occurs when the leading edge of the tsunami causes a sudden decrease in sea level due to the mass of water being pulled towards the crest of the wave.
A tsunami can cause a drawback due to the massive displacement of water caused by the initial disturbance. As the waves travel towards the shore, the leading edge of the tsunami pulls the water behind it towards the crest of the wave, causing a dramatic fall in sea level before the waves reach the shore.
Although a tsunami may cause a fall in sea level before the waves reach the shore, the leading edge of the wave can still cause significant damage due to the massive volume of water and force behind it. As the wave approaches the shore, it can increase in height and intensity, causing destruction to coastal areas.
There are several warning signs that may indicate a tsunami, including a noticeable drawback or recession of the sea, unusual ocean activity, and a loud roar coming from the ocean. However, these warning signs may not always occur, making it crucial to have a tsunami warning system in place to provide advanced notice of an impending tsunami.