Theories:
God is pissed off at the delay's in trump's trials, so She stamped her foot and shook NJ.
As above, but She meant to stomp on Florida and missed. (In which case Judge Cannon better get her honorable ass in gear before her honorable courthouse collapses around her honorable ears.)
It was just an earthquake and it's good to be reminded that Mother Earth is billions of years old and in the sweep and span of cosmic history, we aren't special. Obnoxious? Yes. But not special.