Reports until 15:58, Saturday 08 February 2025
H1 SEI
anthony.sanchez@LIGO.ORG - posted 15:58, Saturday 08 February 2025 - last comment - 12:49, Sunday 09 February 2025(82700)
Lockloss from 8.0 Mag Earthquake

When verbals announced an earthquake I checked the SEI screen the earthquake was listed as an 8.0 Mag!

I then quickly checked USGS and they also had listed it as an 8.0 Mag but it seems like it has since been demoted to a 7.6?
https://earthquake.usgs.gov/earthquakes/eventpage/us7000pcdl/executive

When it struck all the ISI's trip before verbals could finish announcing the earthquake.
I immidiately called Jim and ask him if I should hit the very large Earthquake button, but he said if things were already tripped then it doesn't really matter.




 

 

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brian.lantz@LIGO.ORG - 12:49, Sunday 09 February 2025 (82707)

Here's a plot of the peak velocity as reported by Peak_mon at LLO and LHO. The start time is the time of the EQ, per USGS.

Looks like about 300 microns/sec peak at Hanford and 500 microns/sec peak in Livingston. yikes

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