cheryl.vorvick@LIGO.ORG - posted 08:19, Tuesday 17 September 2019 - last comment - 08:45, Tuesday 17 September 2019(51984)
Lockloss, Maintenance Begins, 14:32UTC
- 14:32 - Richard and Ken to EX, WP8356
- 14:35 - ChrisS driving over the overpass, working outside of the high bay, moving the fork lift
- 14:57 - Karen to EY
- 14:58 - Vanessa to EX
Maintenance started early, after a M5.4 EQ from the middle of the Atlantic knocked H1 out of lock.
- "EQ response zones" map showed the EQ as only 1/3 of the way into the green, toward the yellow (screenshot attached, it's EQ "1")
- turns out that EQs from that direction are like our EQs from Montana, so while a M5.4 from across the Pacific is easily survivable in the IS config WINDY, EQs from the Atlantic are not (screenshot attached of ITMY Z_BLRMS and CPSFF 1 minute before lockloss)
- screenshot attached, of the USGS site info onthe EQ
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Interestingly, we lost lock from a 5.4 in the mid-Atlantic around ~14:00 UTC while barely seeing a 5.2 in Alaska at around 01:00 UTC.
First attachment is USGS EQ map, second is ground motion during mid-Atlantic EQ, third is ground motion during Alaskan EQ
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