TITLE: 07/16 Owl Shift: 07:00-15:00 UTC (00:00-08:00 PST), all times posted in UTC
STATE of H1: Earthquake
CURRENT ENVIRONMENT:
SEI_ENV state: LARGE_EQ
Wind: 6mph Gusts, 5mph 5min avg
Primary useism: 20.46 μm/s
Secondary useism: 4.52 μm/s
QUICK SUMMARY:
As soon as I entered the Control Room, I saw Ryan C. smiling at me, and then noticed LSC signals getting big on the PRMI_sb FOM for a couple of seconds and then BOOM! 7.4M Alaska earthquake! Definitely bigger than the 6.3 Chiapas earthquake Fri morning (w/ only one ISI tripping)---we have a whopping 6 ISI Watchdogs tripped and the Seismic FOMs definitely look much bigger than the Fri EQ, with BOTH eq-bands going off-scale! ....I'm going to put my timer on for an hour before even attempting locking! H1 Observatory Mode is obviously in EARTHQUAKE state.
Oh and it's a balmy 81degF out.
Tsunami Warnings have been sent. Here's the first one for Alaska (link); looks like no threat issued away for Hawaii and south Pacific.
Almost 90min post-EQ. ISIs are all back to nominal. Have been trying Green arms, but they only stay locked for a few seconds before ground motion breaks their lock. Taking ISC LOCK to DOWN for another 30min.
SEI_ENV was at BIG EARTHQUAKE state from 0654 - 0813, and then have been in EARTHQUAKE state.
NOTE: SEI Peakmon is down to about an avg of about 6000 (from 100,000!), but think it needs to be atleast down 2000 or lower to even attempt locking. We Wait.
Just over 2.5hrs since the earthquake and green arms are finally locking (sort of). X&Y have both been able to offload. (Y-arm still seems to be moving a bit.)
Made it past CHECK IR once, but have had a handful of locklosses not making it much past this point.
Peakmon is now hovering around 1000 counts. SEI_ENV is still at EARTHQUAKE state.
Will slowly continue attempting relocking.