So it isn't just e.g. "earthquake in ring of fire" but rather "strong but shallow earthquakes along west cost and central America". He had also predicted a specific spot in Japan that apparently got hit today with a 4 something. (See his last video.)
Anyway, since now he is predicting a continuity along the fracking zones in the center running East and up to East Coast in the next few days, I guess we'll find out how good his methodology is.
The solar connection he is making is per his conjectured model of Earth (which he claims does not have a solid spinning metal but rather a sort of plasma that gets energy funnled to it via the mag. poles). So one would, as you say, expect to see a pattern of heightened activity correlated with the solar cycles. And I have no idea if that is in fact the case.
Let's see how things pan out.
I can predict there will be an earthquake in the pacific ring of the fire in the next 72 hours, but me being right doesn't mean I know anything except that there are a lot of earthquakes in the ring of fire (which is something, but not specific enough to do anything with).
Also, if there is a link between solar activity and earthquakes, earthquakes should show an 11 year cyclic pattern, and they don't.