Reports until 12:29, Monday 15 July 2024
neil.doerksen@LIGO.ORG -
posted 12:29, Monday 15 July 2024 - (79132)
April 18 Seismic Timeline, Lock, Lockloss Summary
Pre April 18
- Camera offsets made : 77139 : April 12
- Unknown issues began with FC IR unlocking : 77164 : April 14
- Solved : high winds : April 16
- Wind induced lockloss : 77192 : April 15
- Audible creak in Control Room
- 5.9 EQ in S. Korea inbound
- Windy making lock difficult : 77188 : April 16
- Squeezing having lock issues 77219 : April 16
- Lockloss - IX saturation : 77224 : April 16 16:41
- Lockloss - reason unknown : 77233 : April 16
- Nominal SQZ angle changes lock-to-lock : 77238 : April 17
- Feedforward and squeezing problem solving
April 18
- Lockloss, unkown cause, Apr 18 01:02 UTC : 77275
- USGS reports 4.3 in Gulf of Cal Apr 18 04:22:45 UTC
- Lockloss, Apr 18 04:46
- USGS reports 5.1 off CDN coast Apr 18, 06:06:04 UTC
- Lockloss from EQ @ Apr 18 06:11UTC : 77259
- USGS reports 4.3 off CDN coast Apr 18, 06:41:45 UTC
- USGS reports 5.2 in Gulf of Cal Apr 18 07:39:39 UTC
- Still aligning : EQ 5.3 from Mexico April 18, 2024 07:39:45UTC : 77261
- USGS reports 4.1 off CDN coast Apr 18, 08:40:12
- USGS reports 3.5 off west coast of Cal Apr 18, 09:33
- USGS reports 4.2 in Gulf of Cal Apr 18, 11:14:04
- USGS reports 2.7 in N Cal Apr 18, 11:28
- USGS reports 2.6 in N Cal Apr 18, 13:21
- USGS reports 5.6 in Gulf of Cal Apr 18, 15:12:30
- USGS reports 3.6 in W Wyom Apr 18, 15:15
- USGS reports 4.3 in S Cal Apr 18, 19:19
Post April 18
- Locked and observing for 36 min : 77280
- Locked for >8.5 hrs : 77281 : April 19, 08:02
- Back to FF and SQZ troubleshooting
- Lockloss, errant gain change at 21:56 : 77283
- Locked for ~4 hours at Apr 19 20:02
- USGS reports 2.9 N of Badger Mt Community Park : Apr 20 04:18:57
- Stayed locked : 77299 : Apr 20, 00:00
- Lockloss Apr 2024, 15:23 : 77301
- Lockloss at Apr 20, 22:25
- 2 relocks : Apr 21 23:58 (windy)
- Lockloss 26 min after mid-shift entry : 77318
- Claim - 5.4 EQ from Mexico at 13:43 cause lockloss
- USGS reports a 5.4 EQ from 19:05 or a 4.4 EQ at 07:28
- I am probably getting time zones mixed up
- Locked and observing for 36 min : 77280
- Locked for >8.5 hrs : 77281 : April 19, 08:02
- Back to FF and SQZ troubleshooting
- Lockloss, errant gain change at 21:56 : 77283
- Locked for ~4 hours at Apr 19 20:02
- USGS reports 2.9 N of Badger Mt Community Park : Apr 20 04:18:57
- Stayed locked : 77299 : Apr 20, 00:00
- Lockloss Apr 20, 15:23 : 77301
- Lockloss at Apr 20, 22:25
- 2 relocks : Apr 21 23:58 (windy)
- Lockloss 26 min after mid-shift entry : 77318
- Claim - 5.4 EQ from Mexico or wind at 13:43 cause lockloss
- USGS reports a 5.4 EQ from 19:05 or a 4.4 EQ at 07:28
- I am probably getting time zones mixed up, but these times conflict
Here are some plots around the EQ from April 18, 2024 at which USGS reports coming from Canada at 06:06.
Using KAPPA_C channel.