I'm a total noob when it comes to geology, so sorry if this is a dumb question. I live on the Ring of Fire so earthquakes are never far from my thoughts. I go to the USGS earthquake page often just to check out how our Earth is doing. Lately I've notice a cluster of quakes just north of Puerto Rico. Here's a screen shot I took just now: A couple observations: These are very small quakes - in the 2.0 to 3.5 range (one 6.4 is buried in there) They vary in depth - from 3 km to over 90 km. The screen shot just shows the last 7 days but it's been like this for months. I don't see any similar thing happening elsewhere on the planet. Maybe Adak comes close, but nowhere near this spot. So, what's going on north of Puerto Rico??