Shock waves traveling faster than the speed of sound were likely caused by nearby aircraft
Tremors felt in parts of the northeastern U.S. on Thursday, including New York’s Long Island area and southern New Jersey, were the result of a series of sonic booms, a regional seismologist said.
https://www.wsj.com/articles/sonic-booms-reported-in-northeastern-u-s-1454018777?mod=e2tw
That boom was Bi Al blowing his stack after read the comments on the Ridgewood Blog. I guess next he will enact an ordinance that no one can read or post on this blog under penally of law.