heliplotwave East to west across USA probably from 5.4 Quake on Atlantic ridge.
Returning newborn Pandas to China as USA spies
Kek
Most Quake waves move west to east and rubble without quake like activity(just a rubble activity) but this wave showed quake activity (a peak and fade away) at each station across the USA
Second smaller heliplot wave seems to be centered mid USA IL,IN,KS, (VA ?) and moving outward both directions.
https://earthquake.usgs.gov/monitoring/operations/heliplot.php
Eastern time is -4 UTC
Central time is -5 UTC
etc.