Mysterious Boom

Yesterday about 3:12p.m. here in Central California, there was a huge BOOM noise, the feeling like a 4.0+ earthquake (single jolt, not rolling) and the windows rattled like crazy, all at once. Only thing is, according to the USGS, there was no earthquake at that time, or even a local quarry explosion (which they also list). Turns out that there was a similar boom in Mississippi on the 6th, and in San Diego, CA just a few days ago as well. Anyone else experience something like this or have any information? It’s all just so very curious!
[Tags: boom, sonic boom, mystery]