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

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.