[blam]

"The slippage of the Northwest American subduction zone has created tsunamis that did a lot of damage to Japan."

Yup. I read that some researchers suspecting a (earthquake) tsunami in the northwest in 1700 confirmed their suspicions by reading some Japanese history about a tsunami in 1700.

There are huge ancient underwater landslides around the Hawiian Islands.

Here:

Giant Landslides of the Hawaiian Islands

[Silentgypsy]

Wow!