patrick.thomas@LIGO.ORG - posted 07:48, Friday 14 February 2020 - last comment - 10:39, Friday 14 February 2020(55097)
Did verbal miss an earthquake notification?
I think there may have been a 4.6 magnitude earthquake in Canada at 11:17:05 UTC that qualified for changing SEI_CONF to EARTH_QUAKE, but did not get announced by verbal.
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Probably seismon got the report after the earthquake arrived, it was only around 1k km away. Probably would have to be almost twice that to actually get advanced warning. I don't remember all of the details but there is only a short window where there will be a verbal notification after seismon predicts the earthquake will arrive.
Since this was a close earthquake, it looks like when Seismon updated, it had a negative time. Verbal will ignore negative times because it thinks the earthquake has passed.
EDIT: Jim Beat me to the answer.