It’s 20-30 miles from the caldera, shallow – about 3 miles deep.
NOTE: There’s lots of large earthquakes in the South Seas and South America – so look at the sidebar here for news. Some are on the FC blog – but it’s hard to keep up!
The USGS says today’s quake is 7 miles deep. This news story may be talking about a recent quake in the same spot –
Red Flag News – (date ?) M2.9 Earthquake only 520 FEET Deep, in the mouth of Yellowstone Super-Volcano! Lava Moving!
(Jan. 31) “At 2:07 PM Eastern Time, a magnitude 2.1 earthquake shook the huge caldera (mouth) of the Yellowstone Super-Volcano. Tremors are typical, this was bigger.”
The ANF map shows it.
5.3 mb = “body-wave magnitude (Mb)” says USGS glossary.
The ANF map says it happened about 2 minutes after this 5.6 Oregon coast quake –
LAT | LONG | M | Depth (KM) | TIME | PLACE
44.9890 -110.0387 5.3 mb 15 04:00:36 Jan. 23rd, 2015 UTC Yellowstone Region, Wyoming
43.2263 -129.9283 5.6 mb 15 03:58:21 Jan. 23rd, 2015 UTC Off Coast Of Oregon, California – Nevada Region