How often do they do that —change both the intensity number and the depth measurement?
(Not counting the other day when USGS announced an 8 and quickly changed it to a 3. I think they all smoke pot at that outfit.)
Well figuring that it’s Easter, there’s probably a bunch of unmotivated kids watching everything.
Initial earthquake locations and magnitudes by the USGS are COMPLETELY automatic - done by a computer. It usually works pretty well, but there are “hiccups” at times.
Within half an hour or so, you’ll see a change for most large quakes with the words “This quake has been reviewed by a seismologist.”
The larger the quake the more you’ll see the magnitude revised. It’s normal for revisions to happen multiple times.
For really large quakes you’ll see arguments over the magnitude of the quake go on for months.