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Over time with the overburden of ice removed, those bodies would rebound.

Of course...and the US is still recovering from the last glaciation (durn Canadians dumping the Great Lakes onto us!). Sure, there's isostatic forebulge and there's gravitational effects, but their magnitude are insufficient to support (literally and figuratively) an ice-dam situation for a more heavily glaciated Antarctica.

This is simply more like a very large ice dam on the order of thousands of feet in height that has a wide area collapse. The water behind the dam simply pours out as fast as gravity can sustain the project. Kind of like a Johnstown Flood on steroids.

Like Bretz flooding, right? Well, where's the support for this wall that the circumpolar circulation keeps frozen? Meltwater above and saltwater below?

And don't forget you're in a divergent (polar) condition, where an MLD of a given magnitude would rapidly disperse as it moved away from the point-source. The Channeled Scablands are...channeled. Without channeling, in the open ocean, you would be dispersing this pulse of excess water.

Where are you getting these hypotheses? Has any modeling (like Komatsu's) been done to estimate this? I'd be interested in any citations. I've been out of that literature for a while now.

Thanks.

You know as fast as world temperatures rose 14000 years ago this would need to go on only a few decades at most, and it would be over in hours although the global tsunami would be traveling North at just under the speed of sound.

Here's where the idea comes from ~ years back I found that the island of Penang didn't have any dirt when the Chinese first arrived (circa 1398 or thereabouts). This was where the Ming elected to establish their base of operations for their Treasure Fleet under Admiral He.

So, how big a tsunami would it take to remove the dirt from Penang, and was that just on the plain below, or did this continue up the hills to the highest elevation of about 2400 feet.

Further research didn't reveal anything, but the Chinese had a well established regime for bringing in the materials they needed to make soil and did so.

We've all seen what just a modest tsunami can do to Indonesia as well as the entire Indian Ocean coastline. Even more recently the Andaman Islands had a fault break/slip and the tsunami warning went up ~ a modest tsunami would have washed over Penang island like it was a turtle in a pond ~ and they'd been back to "no soil".

Fortunately there was no tsunami.

So, looking at Lake Agassiz and the recurring problems with faults near/around Indonesia and what tsunami do, and the damage Lake Agassiz created when the ice dam broke, just scale that up a thousand times.

This isn't a difficult scenario to envison.