According to the USGS, it was a 4.0, just off the coast of Quepos. No injuries or damage.
We're quite lucky here; our earthquakes seem to be small and frequent, which is obviously better than the other way round. There have been some big 'uns, but the largest in the six-odd years I've been here was a 5.4. It was quite exciting really. People pay good money at amusement parks for that kind of a thrill.