What is that large square depression right next to the dashed-line border?
What is the rectangular depression next to the two large orange seismic readings?
Both of those are obviously man-made and very deep, so there has to be some reason to them.
Could be old strip mines. I have seen mining explosions show up on my radar but they are usually not this high in magnitude and not so widespread in a grid pattern.
What is that large square depression right next to the dashed-line border? What is the rectangular depression next to the two large orange seismic readings?
Both of those are obviously man-made and very deep, so there has to be some reason to them.
Could be old strip mines. I have seen mining explosions show up on my radar but they are usually not this high in magnitude and not so widespread in a grid pattern.