aLIGO LHO Logbook

H1 SEI (SEI)

travis.sadecki@LIGO.ORG - posted 03:20, Saturday 17 December 2016 - last comment - 05:25, Saturday 17 December 2016(32649)

EQ Report 7.9 mag. Papua New Guinea

H1 was most of the way through relocking after an unrelated(?) lockloss. IMC started losing lock during relocking attempts when I noticed a vertical line starting to appear on the BLRMS. L1 has been down due to microseism for several hours.

Reported on both USGS and Terramon by the time I noticed its effects
Magnitude 7.9 near Papua New Guinea (initially reported as an 8.0)
First noticed on BLRMS around 11:12 UTC. Terramon reports that R-wave arrival should have been around 11:39 UTC(3:39 PT).
H1 was in lock acquistion at the time of arrival. IMC having trouble locking was my first indication of an EQ.

Comments related to this report

travis.sadecki@LIGO.ORG - 05:25, Saturday 17 December 2016 (32652)

Link

This EQ was large enough (10^2 um/s in the EQ band according to the BLRMS) that it tripped every ISI platform and several SUSes. I switched ISI_CONF to LARGE_EQ_NOBRSXY, but it didn't seem to help the end station ISIs.