Virgo Logbook

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Virgo Runs (O3)

magazzu - 23:03 Thursday 18 April 2019 (45676)

Operator Report - Afternoon Shift 18 April 2019

ITF found in Science Mode, it unlocked at 16:46 UTC due to an Earthquake of Magnitude 6.5 in Australia (see attached image). ITF back in Science Mode at 17:14 UTC with 50 Mpc.

SAT
The suggested procedure for the earthquake ( see report #45661) was not applied because the flags related to SUSP didn't became red before the unlock. The Expert is informed of this event.

Guard Tour
17:33 UTC - 18:05 UTC
19:39 UTC - 20:08 UTC

Images attached to this report

45676_1555618942_20190418 earthquake.png

Comments to this report:

ruggi - 23:33 Thursday 18 April 2019 (45677)

In fact the earthquake did not produce large oscillation of the suspensions, always present in case of magnitude 6.5 (for what I knew). Moreover the lockloss occured 2 hours after the event, which is quite a lot. It is all very strange.