A theory that I formed a number of years ago is that the Juan de Fuca plate can at times rock back and forth in response to forces associated with the gravitational pulls of the sun and the moon on the Earth’s crust. And when there is a fault zone in that area that is getting ready to fracture, that rocking motion can cause the fault zone to be active in the generation of the EM Signals that I work with.

Can you be more specific about how large an area on the fault rocks and how large the motions would be, and how long before the earthquake the rocking appears?

Direct observation would be an easier way to spot differential motion across a large fault than poorly understood EM emissions.