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Insufficient data. The screenshot you made with your phone is horizontal, but you used the portrait mode to take the photo instead of the landscape mode, which could have captured more detail and possibly made it legible.
originally posted by: Degradation33
My question is, did I just catch the normal earth doing normal things, or did I catch an anomalous pre-earthquake perturbation?
Same questioning applies to your OP, is there any temporal pattern and is it a consistent pattern with more than one earthquake?
There are also temporal contradictions. Some say they appear before an earthquake to warn that it's coming, and some say they happen during or after a quake. This lack of consistency tells us one thing very clearly: This is almost certainly not one, known, proven phenomenon.
My take is that most of the EQL (earthquake light) phenomenon is sufficiently anecdotal that it should be dismissed pending decent evidence. What remains is plausible, though still backed up by only incomplete theory and poor evidence, and that's conventional lightning striking near active faults during quakes. It's a plausible idea, in search of better observations with better theory to explain them.
So that's very relevant to what you're looking at since lightning strikes are thought to be the origin of the Schumann resonances
At any given moment about 2,000 thunderstorms roll over Earth, producing some 50 flashes of lightning every second. 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.
I wasn't aware of that, but I presume more research is needed.
There is some evidence that electromagnetic precursors for earthquakes may be found in the ionosphere itself though. How useful that may be is questionable.