- Was it reported by Terramon, USGS, SEISMON? USGS report@time of quake; Terramon reported @ 16:48; Seismon not running
- Magnitude (according to Terramon, USGS, SEISMON) - USGS reports 5.0; Terramon reported ≈9µm/s then updated to 16.1327 ?!; Seismon not running
- Location (according to Terramon, USGS, SEISMON) - See attached image below.
- Starting time of event (ie. when BLRMS started to increase on DMT on the wall) - probably a minute or two before the lockloss
- Lock status? Did H1 lose lock, get a glitch, or showed no effect? - Lockloss
- EQ reported by Terramon BEFORE it actually arrived? - NO
Interesting to note: After I noted all of the pertinent information for the California quake. USGS updated and inserted 3 more quakes in between the one reported here and the previous one in California. (2 that could have contributed to the detriment of the lock) See far right attached image.
OOPS! USGS didn't update in the way that I thought it did. I was zoomed on California, so those were the only showing in the margin. Sorry about the mis-post.
I'm attaching a few lockloss plots. The first two are the "stock" lockloss plots, one from about ten minutes before the earthquake and one at the lock loss. These plots are a number of useful angular signals from the IFO. Not much to say, but it looks like the arm angular controls are the ones that get the most upset (ASC C/DHARD/SOFT). They seem to go up by ~10x or more, while PRC/SRC etc go up by a factor of 4 or so. The point where the are ASC gets fuzzy at -10 seconds on the second plot looks to be of interest. Did we saturate some sensor here?
The next two plots are of different length drives for different suspensions, some ISI sensors and some ground sensors. Third plot is for 10 minutes before, the fourth is for the lockloss. I also included the MICH freeze signal (LSC_CPSFF), which looks like it could be interesting to monitor during an earthquake. Most of the time this seems to be a couple hundred nanometers peak to peak, but during the earthquake this grows to a couple thousand. We didn't get much warning for this earthquake (it was in California), so I don't know what good monitoring local sensors would have done this time around.
