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North Korean nuclear test sets off years of earthquakes

225 points · 181 comments · rbanffy

  1. margalabargala · · focus · HN ↗
    Could this be considered a good thing?

    The energy being released in these many tiny earthquakes was always going to exist in this location. Much better to release it slowly via thousands of tiny earthquakes than all at once. Better to have 10k magnitude 3 quakes than one magnitude 7.

    1. jjk166 · · focus · HN ↗
      If you have an anvil hanging over your head, the potential energy that would kill you already exists. Slowly lowering the anvil makes sense. Damaging the rope holding the anvil doesn't.
      1. ryanisnan · · focus · HN ↗
        I don’t think this is a good analogy.
        1. jjk166 · · focus · HN ↗
          If you have an ~~anvil hanging over your head~~ ton of compressed rock under you, the potential energy that would kill you already exists. Slowly lowering the ~~anvil~~ potential energy of the rock makes sense. Damaging the ~~rope holding the anvil~~ rock containing the energy doesn't.
          1. wongarsu · · focus · HN ↗
            But setting off small earthquakes doesn't just damage the rope, it also lowers the anvil. Also the anvil in our analogy is constantly getting heavier, so the chances of our rope holding forever are very low
          2. ryanisnan · · focus · HN ↗
            Yeah, I mean, I understand the words you wrote. I don't think it's a good analogy.

            It is entirely feasible that the same amount of potential energy, delivered either in small, successive amounts, but spaced out, proves to be tolerable, while a single large amount would be fatal.

            1. vasco · · focus · HN ↗
              That's what they said about slowly lowering potential energy.
        2. Terr_ · · focus · HN ↗
          It makes sense to me, if you consider that a "damaged rope" is a bit more elastic, so it stretches more, and allows the anvil to come to rest at a marginally lower position above your head. But only marginally.

          In other words, it'd probably a terrible tradeoff to reduce the impact of some disaster by 0.0001% at the expense of making it 0.1% more likely/frequent to occur.

        3. andrewflnr · · focus · HN ↗
          I think the real problem is that you don't know whether it's a good analogy in your situation. You don't know whether you're lowering the anvil or just fraying the rope. It depends on a lot of hard-to-measure things about your whole geologic situation.
      2. moffkalast · · focus · HN ↗
        I think this is analogus to lowering it bit by bit in small but manageable head bonks.
        1. jjk166 · · focus · HN ↗
          The issue is the mechanism of "lowering" it. You're not giving it more slack.
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