Carlsbad 2 blocks from the beach carlsbad Village area! It lasted about 15 seconds the whole apartment building 2 stories was rattling and the ground and air seemed very loud roaring but no ground shake like a traditional earthquake.. It was about an hour before a 6.3 earthquake in China. I see gas bubbles coming up in the beach water near the waves quite often too. It's really nothing weird, if it is earthquake-related. We're all around it. SDG&E even knows the beaches release natural gas all the time. But I'd like to know if sonic vibrations increase with distance and or when they begin to decrease and eventually stop at mountain ranges we have in So Cal. But someone said they were felt/heard in vegas.
And according to news articles, navy spokesperson's have said the distance of booms felt could be up to 50 miles. Evidently, the navy was out about 30 miles when their pilots are said to have been flying. +mach1 speeds