I've been to the Chartres Cathedral and walked that maze as well as several others. I found it an interesting and challenging undertaking, and that is all. There are so many scientific theories bouncing around this globe about one thing or another, that it's truly mind-boggling. However, if one really looks at most of these so-called theories, it is fed by pseudo-science at best.
Truth be told, I poo-pooed it, but I can understand the electromagnetic wave. Still, it's effect on humans I have trouble with. "What causes Schumann resonance" "Each lightning burst creates electromagnetic waves that begin to circle around Earth captured between Earth's surface and a boundary about 60 miles up. Some of the waves - if they have just the right wavelength - combine, increasing in strength, to create a repeating atmospheric heartbeat known as Schumann resonance." So it's the electric magnetic wave and not the planet itself resonating.
Here is an amazing picture of what the Schumann Resonance look like today (June 18th) and it is a totally different appearance than I have ever seen on the charts. Here is the information that NASA. Has on their website about the Schumann Resonance and what causes it. It is an older picture , but still explains how the phenomenon works, in scientific terms. https://www.nasa.gov/mission_pages/sunearth/news/gallery/schumann-resonance.html