San Clemente has a range. Used to hear them in my Del Mar youth.
Heard them going off just 2 nights ago here in south OC. I've heard the booms since living here from 1995. When my Wife moved in, she thought earthquake - had to explain Navy guns. The decibels depend on the atmospheric conditions, so I'm told. Some are like distant thunder, others have rattled the windows. They usually start in late afternoon or early evening hours and stop by or before 22:00 hours. Frequency is about once a week or longer, and just for one day.