Of course; the continued movement of the North American plate westward, building up stress, which it's been doing for millions of years. This stress is released in earthquakes of varying magnitudes.
There's nothing EXTREMELY unusual about the Northeast earthquake or this recent earthquake; taking a big picture view, they're decidedly normal. And not necessarily a precursor of anything.
Not even a sign that Planet X [Google Search] is rapidly approaching, and beginning to destabilize our planet's core? :-O Gasp!
Actually, the NE gets a tremor about once a year...for which I personally am greatful. As long as we get tremors, we know the pressure is being let off the fault. It's the LACK of tremors along known faults that oughtta worry people.