I'll just bet before long sprites start emitting from such cracks as the Earth changes.
This is ALL electro-magnetic in nature and it has to do with the changing dynamics of the planetary charge (leaking magnetosphere), an agitated solar sphere (leaking heliosphere) and large hidden bodies moving in space.
Kinda like a static charge from rubbing woolen socks on a carpet in low humidity conditions. Except a hell of a lot bigger.
Z-Pinch plasma discharges. May be able to see the ion tubules. It will sound like a extremely loud trumpeting noise or electrical current snap and crackle around metallic objects.
The ion stream could create new non-ferric elemental metal deposits.