Not credible. The deepest (diamond) mine is 4.0 km and that takes a lot of effort. Cheyenne Mountain is the only major military base I can think of and it is only under a mountain, not deep below the surface. It makes no sense to create a major civil engineering project that can easily be destroyed by a surface-burst nuke.
In general, earthquakes with epicenters 10km down are likely to be DUMB destructions.
Lots of these types of earthquakes.
Not credible. The deepest (diamond) mine is 4.0 km and that takes a lot of effort. Cheyenne Mountain is the only major military base I can think of and it is only under a mountain, not deep below the surface. It makes no sense to create a major civil engineering project that can easily be destroyed by a surface-burst nuke.