1081907495
Apr 18 2014 18:51:19 PDT
Apr 19 2014 01:51:19 UTC
Stage 1 and Stage 2 actuators.

Found the trip after 12 hours had passed, so couldn't check the seismic FOMs, but judging by the amplitude and frequency of the actuation control before the trip, and the large amounts of earthquakes recently, that would be my guess. There's a couple of small ~ 3 [mag] EQs arounf that time, capped with a 4.7 [mag] in Northern Alaska at 01:49 UTC. Disappointingly, USGS no longer has those "time of arrival" contour maps (or I couldn't find it with a bunch of clicking around the site), so you can't use that to narrow down which earthquake was yours.