aLIGO LHO Logbook

H1 AOS

corey.gray@LIGO.ORG - posted 18:30, Tuesday 31 March 2020 - last comment - 12:58, Thursday 02 April 2020(55838)

6.5 EQ Hits In Idaho & Trips Most SEI/SUS

(Corey, Jeff K, Jenne, Jim, Keita, Sheila)

My friend texted me (about 5:20pm PDT) about feeling an earthquake in Spokane, so I looked online and saw that it was in fact a 6.5-magnitude earthquake (about 70-80miles from Boise!) at about 4:52pm. This was a big one and probably a bit closer than the 5.8-magnitude Montana EQ of July 2017).
Looking at the OPS Overview screen showed almost every system's watchdog was tripped for SUS & SEI (there were a couple of SUS which were not tripped...ZM1 & SR3 Jenne noted).

I checked to see who was on Teamspeak and reached Keita & we chatted. He sent out a group text to people and we started addressing H1 to bring everything to a "safer" state. Jim said the SEI systems were in about as safe of a state as could be for this, so that's good. We all then started damping SUS & SEI systems and returrned all systems to a state they were set to on Monday (took roughly from 5:48 - 6:04pm).

Side Note on watch dog medm screens: For Remote Operating, it was a bit painful to get some of the Watchdog screens (they would open up on Monitor 2, so on my monitor I barely saw them on the screen and it was a pain/impossible to access/move the screen!

This is our first big seismic event since the Montana EQ and offers a good test to see how Watchdog changes handled the situation (a homework assignment for Jim or commissioners?).

Tornado SIDE NOTE: A tornado touched down in West Richland just before the EQ rolled through!

Images attached to this report

Comments related to this report

camilla.compton@LIGO.ORG - 11:01, Wednesday 01 April 2020 (55840)

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For the medm screens being hard to see. If you right click on the tabs along the top of the screen, you should get a "move" option, to let you drag the medm onto your screen.

For a longer term fix, the medm can be moved onto the left screen by editing and saving from within the directory they are stored. I will do this for HEPI WD medm.

Done by opening them using the command: medm medm_file_name.adl, then changing their location using: edit > select display > should get a pop-up where you can change x-position and y-position to bring it to a better position on the screen. (0, 0) being top left corner.

Images attached to this comment

corey.gray@LIGO.ORG - 10:51, Wednesday 01 April 2020 (55841)

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Just for a historical note on "local" earthquakes for LIGO. The other big one which comes to mind is the 6.8-magnitude Nisqually earthquake.

This earthquake did require us to vent and do work on suspensions. We still have the "elog" but one needs to use the generic login to read entries:

H2 SUS assessment by Stan from the Control Room: Basically multiple test masses had magnets fall off. RM had wire issue. MC1, MC2, SM1, MMT1, MMT2, "not hanging free". Attaching a screenshot, pardon the text...I don't think html formatting carries over for the old "elog". But basically (lots of misaligned optics, some magnets broke off, and atleast one has wire issue.)
Overall it looks like March - May-ish, H2 had repair work done on several optics. (I think H1 might have been in an installation state, so no damage really noted for it.)

Images attached to this comment

edmond.merilh@LIGO.ORG - 12:58, Thursday 02 April 2020 (55850)

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The W Richland tornado seems to have been classified as a "landspout" due to the lack of the updraft needed for a regular tornado. Landspouts spin up from the ground rather than down from the sky. This is the first time I've ever heard that term used.