If the earthquake triggered memories of last year's big shake there are some key differences. Last year's earthquake centered near Tewksbury, New Jersey, was a magnitude 4.8. That's almost 20 times stronger than Saturday night's earthquake.

An earthquake rocked New Jersey late Saturday night — luckily, though, fairly softly. It was reported to be a magnitude 3 quake, generally considered to be a minor, “low energy event” that would not be extremely noticeable or cause extensive damage.

A magnitude 3.0 earthquake centered in New Jersey briefly shook NYC Saturday night, prompting emergency guidance but no major damage.