Baker, this is interesting and didn't get a lot of traction few breads ago.
California "Earthquake" - 2018-04-05 19:29:16 UTC
http:// ds.iris.edu/ds/nodes/dmc/tools/event/10724562
North Korea Nuclear Test - 2017-09-03 03:30:01 UTC
https:// ds.iris.edu/ds/nodes/dmc/tools/event/10400146
Similar signatures, if not lay downs.