Are you series?
This is the equivalent of you slipping into the bathtub.
Given the size of the Canary Islands and the size of the Atlantic Ocean, it's more like me dropping my keys in the bathtub. Probably less in terms of the ratio of land mass vs. the amount of water.
I just don't buy the proportions here - this much rock vs. the Atlantic does not equal all that much displacement, proportionally. I know it would cause a massive disturbance, but I don't see how it would propagate a 300 foot tall wave 3000 miles away.
"I don't see how it would propagate a 300 foot tall wave 3000 miles away."
Water is a transmission medium, you create a disturbance at one end and it is propagated for long distances. The rising shoreline at the other end causes the wave to rise. A normal earthquake tsunami is typcially limited to 30 feet or so due to the nature of the event that causes it. Landslide tsunamis are altogether different as to their consequences.