I responded to a similar post two breads back.
>>6082011 Why are there so many earthquakes at 6.2 km (10 miles) deep? (pb)
>>6083023 (me pb)
>I think anon inverted the distances - 6.2 miles = 10 kms
>I know that this is the default depth used by USGS when they don't have data and I'm guessing that IRIS does the same.
>I've noticed this .2 number seems to coincide with some pretty funky wave forms, be it magnitude 4.2, 5.2 or 6.2 when coupled with the reported depth of 10 km.
>Here's the wave form from the one in the Gulf of Mexico yesterday.
http://ds.iris.edu/ds/nodes/dmc/tools/event/11023096