> deep geothermal with fracking technology.... this creates small earthquakes as a side effect. In typical HN form I'll say: "That's a bit of an oversimplicati

> deep geothermal with fracking technology.... this creates small earthquakes as a side effect. In typical HN form I'll say: "That's a bit of an oversimplication". Apologies, please don't hate me. Thanks for quoting all your sources though btw. The wrong geology absolutely will create minor earthquakes. This is because any fluids injected into certain rocks layers provide "lubrication" and things start slipping. Pretty crazy how much pushing is happening down there and things remain at equilibrium most of the time! However, all is not lost. Certain geologies absolutely can take external fluids no problem, because they previously contained fluids... yeah... I'm talking depleted oil wells. A bit ironic I guess. This happens all the time already in the midwest, depleted oil wells are turned into saltwater injection wells. The problem is most of the time, you can't just plunk a depleted well down anywhere that happens to have the right geology underneath it, which the geothermal guys were hoping for. Pushing high pressure water into previously dry formations will likely cause problems. No free lunch, but it is possible in certain areas. A lot of said areas aren't likely near population centers unfortunately.