It would leave meter crater if we are assuming an implimentation of the original. I doubt this is causing earthquakes.
The ZUMA orbiter was seen in its first orbit, so its unlikely it was immediately deorbited before any on-board problem could be resolved by ground controllers.
Its in a 51 degree inclination and at 900KM altitude which indicates wide area coverage, but not for optical surveillance.
The launch window was 2 hours, which indicates they did not care where in orbit it wound up.
This is a strange project. Best guess is a weapon against a specific ground target or series of targets, It may be part of a system that includes an array of satellites some of which may already be in orbit, and others to follow.
I think this means NK war will not be initiated until February or March.