TITLE: 02/20 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Relocking
OUTGOING OPERATOR: Ryan C
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 4mph Gusts, 2mph 3min avg
Primary useism: 0.03 μm/s
Secondary useism: 0.42 μm/s
QUICK SUMMARY: Just lost lock from a nearby earthquake. Barely saw it on the picket fence before we lost lock, but our control signals were moving. For the 8 hour lock that just ended, 4 hours ago there was a step down in the range and then less stable range. DARM looks to have more noise in the 80-200Hz area, my screenshot doesn't show it completely. Violin mode 6 was slowly ringing up overnight.
TJ, Camilla. No extra noise in the channels that usually show our low frequency non-stationary noise 82728, see plot. Comparing DARM before and after, there is very subtle changes <100Hz. TJ found the summary pages show more glitches at 60Hz and ~48Hz.
Additionally, we see the line at 46.09Hz or 46.1Hz grow, see plot. Georgia noted this line in 2019 47447 and Evan piont us to O4aH1lines list where this apears to be the PR3 roll mode.
Running the range comparison scripts for a few different times and spans around the range step. There looks to be a slight bit more noise all the way below 100Hz, and the 60Hz is very slightly higher.
The range step happened at 330am almost exactly and since the 60Hz line got worse, I'm wondering if there is something that turned on or updated right then.
