Actually, I understood your explanation better. Thx!
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…of uniform composition, travelling in a vacuum…
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I’m guessing that there is an atmospheric hole as well. Presumably the air is drawn to the relatively higher gravity away from the hole. An altimeter would read zero in the hole.
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It will gradually fade as the detached subducting slab sinks further into the Mantle.
Eventually the slab will come to an equilibrium with the surrounding material, but how long this takes is anyone’s guess. Geologists and geophysicists like having arguments about what happens to subducted plates - some think they eventually come to rest deep in the Mantle (although no one agrees on just how deep), some think they eventually descend all the way to the Core-Mantle boundary. Seismic tomography data is very contradictory on the fate of subducted plates - in some places you can see the slab going deep down into the Mantle, in other places it quickly becomes very fuzzy indeed. A quick read of this paper suggests they have not imaged a detached slab in the Mantle, only that the presence of one would explain things neatly (just as the detached slab under Tibet hasn’t been seen, but it does solve a big problem).
It’s a very slow process; ‘fast’ plumes typically move between 2 and 5 centimetres per year which is about the speed of most surface tectonic processes - or, if you prefer, about the speed your fingernails grow.
Changes in sea level due to Mantle redistribution are the same as the post-glacial rebound which is almost entirely due to mass flows in the Mantle rather than any changes in the Crust.
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That map looks like a bad Geometry Wars knock off. Which is kind of exactly what I think of when I hear the words “gravity hole”.
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And how many conspiracy theorists will not claim that this is the location of Atlantis, and the Atlantians just cranked up the power of their anti-gravity generators to prevent their carbon-fiber underwater domes from collapsing?
Yes, they also heard of that recent incident.
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Altogether now:
The Earth’s a lumpy play-doh nightmare spud from way out there… 
I thought we settled this already. It’s a triangle.
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According to wikipedia, yes, actually!
Michell was…described by a contemporary as “a little short man, of black complexion, and fat”,
You just made my day, thanks!
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That’s interesting, but does “WTF,” in the article mean what I think it means? Or is that the name of a group of geologists? As we used to say, when I was enlisted in the U S Air Force, there are NO dumb questions just dumb answers.
It means “what the fuck” and is now common internet terminology to express disbelief.
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Highly unlikely.
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That just means it is delicious and should be fried.
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It is currently baking, but I am unsure about the taste.
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The answer is yes it would bend the light, but not in any meaningful way with instruments as clumsy as human eyes. The light from a star passing the sun is deflected at an angle comparable to a dime over a mile away. The Earth is a tiny fraction of that and the difference between different regions on the planet is a smaller value still. Changes in humidity over that distance will have a much bigger effect on light than gravity.
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