[george76]

It is impressive what some tsunamis have historically done.

Pushing water and everything else up fjords, big hills, across flat open spaces...

I saw a show of debris pushed up hills hundreds of feet in Alaska and the land slides under the ocean around Hawaii are very amazing ( to me at least ).

[Fred Nerks]

Scripps Institution of Oceanography/UC San Diego LINK

A crack is visible from the Gaviota slide (left) towards the Goleta slide (right) near Santa Barbara. Planned research deployments include acoustic geodesy transponders and nodes (yellow cubes and spheres), FOSS cables (red lines) and sediment cores (orange cylinders).

[geopyg]

Here in Washington State we had the floods from Lake Missoula - some of the large hills (200’ plus in height) near the Columbia River are actually ripple marks from the last flood! Here’s the website for the Ice Age Flood Institute:

http://www.iafi.org

[BIGLOOK]

Check out the lava bench that slipped into the sea a couple years ago. There one last summer too just not as big.

If you look at the Ko'olau mountains on Oahu, you'll see the semi circular pattern of a collapsed caldera.......the rest went below the waves. (And you can bet the farm that the seismic sea waves that followed reshaped the Pacific coastlines of three continents.)