Is a 12,000 foot+ Megatsunami possible?

It is possible, but very unlikely. The chances of this happening are very slim, but it did happen before in recorded history. When Krakatoa exploded, a massive tsunami was launched, swallowing up an island chain in the south pacific. A huge portion of the sea flor was exposed. Hope this helps!

During the next magnetic pole flip you'll get to see one briefly. 

Nope. Things like that haven almost happened.

The largest in history was 10,000 feet and was the source of the legends of the great flood which are present in every culture. This is why all known civilisations started in areas 10,000 feet above sea level.

It is possible.A megatsunami is a very large wave created by a large, sudden displacement of material into a body of water.

Megatsunamis have quite different features from other, more usual types of tsunamis. Most tsunamis are caused by underwater tectonic activity (movement of the earth's plates) and therefore occur along plate boundaries and as a result of earthquake and rise or fall in the sea floor, causing water to be displace

It is possible, but very unlikely. The chances of this happening are very slim, but it did happen before in recorded history. When Krakatoa exploded, a massive tsunami was launched, swallowing up an island chain in the south pacific. A huge portion of the sea flor was exposed. Hope this helps!

Akib

Typically, tsunamis aren't high waves, they are long waves.  The damage is caused by the amount of water.  If you search for them on YouTube, you will see that they don't appear to be that big a deal until they hit land.  They just keep coming and coming.