http://earthquake.usgs.gov/learn/kml.php
Top category on this page will open up Google Earth showing the plates and quakes.
Puerto Rico seems pretty active at the moment.
OTOH you can go
here to see a map of earthquakes in the past 8-30 days and magnitude.
Here is a page with maps of where the Earthquake happened. Looks like the NW edge of the Carribean Plate where it meets the NA plate.