This is a 5+ normal (extension) earthquake, caused by injection.
It's in the middle of nowhere. No geology is known, but it looks like an ancient impact crater with circular edges. I can't see any growing mechanism, but the earthquakes will get bigger. Next will be a 6 encompassing the whole fracture fault area. A few people will feel that.
Until it gets a spur, I can't see it going to M7. However, continuous injection can do anything.
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