Btw, I'm not a CGM.
Ok. Here's another example.
You have a staircase (which is a terrible analogy since it's non-radial, but I can't think of anything better). The lowest point of the staircase is still at a higher elevation than France. So we can include that every point of the staricase is higher than France, yes?
Now you have a 6.5 earthquake (3.548134e+14 joules in total). Its radiated waves can reach the ionosphere, but it doesn't reach every segment of the ionosphere when its a singular event on its own (again, 3.548134e+14 j) that expends all of its energy outwards.
However, that changes if 6.5 is actually the lowest point of our hypothetical staircase. So every part of the staircase hypothetically exceeds 6.5 because it's not actually diminishing or the epicentre (it's the opposite, in fact), and the actual epicentre had far, far more energy initially.
Its energy isn't expanded outwards because it is the energy that has been expanded outwards, so every part of the earthquake has the same result as the 6.5's epicentre, meaning it can reach the ionosphere.