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Jun 26, 2021 at 17:45 comment added jamesqf @MolbOrg: Solids and liquids are basically incompressible, so you can't thrust 30 million km^3 of magma UP without the crust going DOWN an equal amount somewhere else. Consider that there are fairly practical real-world examples, such as Hawai'i and Iceland. The Big Island is about 300K years old and is a mere 4K square miles (10K km^2). Iceland is about 20 million years old, and its volcanic eruptions can still cause significant problems for the rest of the world.
Jun 24, 2021 at 21:23 comment added MolbOrg Displacement of water sure matters, but also it depends how things are done, and how things are done involves considering problems at hands and this is my main point. Out of energy or displacement - energy is a bigger one, initially. I read more about tsunamies and indeed amount of water to create those waves isn't huge, 10-100 cubic km's in under a hour time. Making it 1000y project, and assuming erruption way to do - it will be the whole time tsunami for coast lines, but cooling down to solidify the thing will deliver heat on pair with the sun, rendering whole planet dead in few years.
Jun 24, 2021 at 18:50 comment added jdunlop @MolbOrg - the earth wouldn't thrust 30M cubic km of magma out and up all at once, so your cooling calculations are irrelevant as far as creating a tsunami is concerned. Your point re: how much energy would be required to be dissipated is well taken, but you'd still have a series of tsunamis.
Jun 24, 2021 at 18:14 comment added MolbOrg Writing an answer so wait for it. While you wait, spend 10 minutes on calculating what 16 to 30 million cubic km of magma means, or read my comment under ops q.
Jun 24, 2021 at 17:53 comment added jdunlop @MolbOrg - your comments are uniformly unhelpful walls of incoherent text, so saying that I "didn't considered[sic]" something is rather rich. A human-induced underwater supervolcano would absolutely induce tsunamis, as illustrated by normal tusnamis induced by major undersea volcanic and geological events.
Jun 24, 2021 at 17:19 comment added MolbOrg Actually there are few more problems with answer, a root one probably is that u didn't considered what it means to have the continent and associated changes from the physics perspective. Would u have done that, you would know that tsunami is not a problem. Hard to tell which other changes to you perception of the problem it could have been done. Near future is vague, I would include nanotech, but I think it can be possible in good old 70's way with bunch of nukes to break the crust, bit by bit, not the whole thing. Transportation is an option - reasons why it is impossibur instead impossible.
Jun 24, 2021 at 15:30 comment added jdunlop I don't use the word "impossibur" anywhere. And (despite your protestations to the contrary), the OP specified "The tech level is near future with some more advanced tech sprinkled in.", which is vague but enough for me to be confident in the "impossible" statement.
Jun 24, 2021 at 15:08 comment added MolbOrg Impossibur is the only wrong word here
Jun 24, 2021 at 14:57 history answered jdunlop CC BY-SA 4.0