Lot's of these incidents the past few months. The San Diego area ones have happened multiple times and my friends there have heard and felt them. Probably just a bunch of random events with multiple causes and media is just focusing on it. Some are claiming "sky quakes" which is a term I had never heard of before tonight and sounds pseudoscience. A lot of people are working from home etc and it's also easy to come up with exaggerated stories when you are bored or searching for excitement. Still interesting though.
Anyway, here is a list of some from the past few months:
https://www.forbes.com/sites/davidbressan/2020/12/22/seismologists-investigate-unexplained-skyquakes/?sh=1be230c5446e
https://www.sandiegouniontribune.com/news/public-safety/story/2021-03-10/mysterious-shaking-again-rattles-san-diego-county
https://www.10news.com/news/local-news/mysterious-shaking-reported-in-san-diego-tuesday-evening
https://www.sacbee.com/news/nation-world/national/article246755346.html
https://www.milforddailynews.com/story/news/2021/03/17/mysterious-booms-baffle-residents-hopedale/4730232001/
https://miami.cbslocal.com/2021/01/16/unexplained-shaking-rattles-south-florida-residents/
https://www.kxan.com/news/local/austin/loud-booms-in-south-austin-lead-to-911-calls-but-no-explanation/
https://www.tristatehomepage.com/news/local-news/several-tri-state-residents-report-hearing-loud-boom/
https://journalnow.com/news/local/numerous-reports-of-loud-noises-in-lewisville-reported-to-forsyth-county-sheriffs-office/article_8ba3d52a-4d64-11eb-b9c6-63bbf0ac9fa3.html
https://miami.cbslocal.com/video/5204371-unexplained-shaking-rattles-south-florida-residents-on-friday/
https://kvoa.com/news/2020/12/29/cause-of-mysterious-booms-leave-tucsonans-shaking-for-answers/
https://www.ladbible.com/news/uk-sonic-boom-heard-in-south-west-england-thought-to-be-caused-by-meteor-20210321?source=twitter
https://www.outlookindia.com/website/story/india-news-strange-noise-quake-like-scenes-stir-up-panic-in-tamil-nadu-districts/378447