[Caramelgal]

This has been debunked by a consensus of tsunami scientists. …collapse of La Palma

I watched a program about La Palma and wondered if its collapse could really generate 165 foot wall of water to hit the East Coast.

When you think about it, dropping a large heavy object into water will generate a wave but its effect is local and it dissipates rather quickly given a large enough body of water.

So if I do a cannon ball into the middle of a small pool, the wave created will hit all sides of the pool. But if I cannon ball into a larger and deeper body of water like a lake, it won’t even cause a noticeable ripple on the opposite shore.

Of course a mountain falling into the ocean will displace a lot of water and make a darn big splash and cause massive damage to any nearby islands and local shipping, but I’m a little skeptical that NYC would be inundated by a 165’ wall of water.

http://www.lapalma-tsunami.com/

[Man50D]

When you think about it, dropping a large heavy object into water will generate a wave but its effect is local and it dissipates rather quickly given a large enough body of water.

It seems to me you are comparing apples to oranges. Your body is not generating a wave extending down to the ocean floor. It is only creating a surface wave. The debris from a massive landslide will reach the ocean floor and therefore generate a tsunami that extends down to the ocean floor as does an earthquake generated tsunami. Some energy will be lost reducing the initial height from 300 feet down to 165 feet but there isn't enough friction between La Palma and the U.S. to dissipate the tsunami.

Of course a mountain falling into the ocean will displace a lot of water and make a darn big splash and cause massive damage to any nearby islands and local shipping, but I’m a little skeptical that NYC would be inundated by a 165’ wall of water.

There is one factor you're not considering with respect to NYC. Long Island Sound narrows as you move towards NYC. The narrowing of Long Island Sound along with the rising ocean floor may very well push the wave height of a tsunami to at least 165 feet and possibly higher.

[Jaded]

Wasn’t California suppose to fall into the ocean? Would this cause a sizeable Tsunami or just taint the water supplies?