"Does anyone know what the "traditional" response to these sorts of ground movements was?"
The very old tradition was to increase the amounts of sacrifices to the gods, because clearly they were angry.
The very old tradition was to increase the amounts of sacrifices to the gods, because clearly they were angry.
And I was not necessarily talking about human sacrifice, even though it seems very likely, that this happened as well.
https://scandinaviafacts.com/did-the-vikings-perform-human-s...