Comment by radicaldreamer
4 years ago
We have satellites which can detect a double flash (characteristic of a nuclear explosion), the US and probably most other nuclear powers with the exception of perhaps North Korea and Pakistan would know instantly of any nuclear detonation above ground.
Not to mention the net of seismographs across the US. Those would tell us within our own borders if a nuclear detonation has occurred within seconds of impact.
We have seismographs and other measurement & signature intelligence collection means all over the world, and there's an elite unit in the US Air Force dedicated to detecting and localizing nuclear detonations no matter where they occur (as well as event attribution, nuclear forensics, intelligence gathering, etc.).
https://www.airforcetimes.com/news/your-air-force/2019/04/21...
https://en.wikipedia.org/wiki/Air_Force_Technical_Applicatio...