I've started watching the earthquakes around the world, using an app called Earthquake Alert. I'm amazed at how many quakes in the high 3 to low 5 Richter Scale range occur at that depth. Did I read here that the DUMBs are at that depth? Also, all the quakes around Tonga are at that depth. Interesting?
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Shallow earthquakes near faults or hot spots is normal. Where it is not normal is when they occur in mid plate areas. More often mid plate seismic activity is much deeper than 10 Km.