I thought the CA offshore base was under Catalina, but either that or the USGS location could be off.
Maybe Q can confirm whether or not those bizarre 5.0+ quakes in 2011 under DC and Denver were the first DUMBs to go. I remember that clearly.
Also the strange sound of air escaping at a baseball game in Tampa, same day… https:// youtu.be/NaA_WQz49ZI