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On human timescales, it's likely not very much would happen. Earthquakes happen when built-up stress gets released, so even if you stopped any further subduction, every plate has a lot built up! Subduction also isn't the only way to put stress on faults, so you'd still have plenty of other quakes...

...but you'd eventually lose the largest-magnitude ones. As for volcanoes, they'd also go for a long time, since magma has a big journey from subducting slab to surface. You also don't necessarily need subduction for volcanism to happen! There are volcanoes on planets/moons without plate tectonics.

On the long timescales (like 100,000 years or more) where you would notice things, one of the biggest impacts would be on the climate! Subduction/volcanism are a big part of the long-term global carbon cycle, regulating the amount of CO2 in the atmosphere! The hover text on the comic mentions this.

I'm not even sure what locking a subduction zone means. It's completely locked for most of its existence and the yield strength of industrial metals isn't *that* different from the yield strength of an oceanic plate. It's either just introducing new asperities or triggering subduction initiation.

Plate motion is caused by friction from the underlying convecting mantle. If you were to "lock" the plates, it would be fine for a while (in geological terms), but the underside of the plates would start to erode more quickly and the plates would get thinner. Probably not good

Oh shit! The bolt has an SAE thread, and DOGE ordered a metric wing nut. Not only that but the wingnuts were a lot cheaper in a 5 pack, so they ordered 5 to save money.

Start at start and old is best. Corks in mid-Atlantic ridge. I suggest using angle grinder across San Andreas fault and filling the slot with reinforced concrete to stop the slip.

I had worked with Darwin Crum back in the '80's at ECM motor company in Schaumburg, Illinois. His theory was the world is held together with left-hand threaded screws. I have a love-hate relationship with gravity. Great for skiing, not so much for flying.

good thinking - frankly those earthquakes were becoming really annoying that one summer night I had just sat myself on my bed - suddenly the room was moving in all directions all at once - I took everyone outside for a few hours because aftershock risks - slept on uncomfortable garden furniture

Yes preload can raise friction forces. Friction forces due to preload are very limited compare to a good opposition of material like in the use of ajusted pins or rivets. (aerospace screws are also ajusted) Preload is first use to reduce fatigue due to repetitive stress in tension.