aLIGO LHO Logbook

LHO General (PEM)

dale.ingram@LIGO.ORG - posted 15:22, Friday 20 February 2015 - last comment - 14:05, Saturday 21 February 2015(16832)

Hanford site seismic

Several commissioners feel that our new seismic defenses leave H1 insensitive enough to truck traffic that our Hanford site contacts no longer need to email me weekly with reports of their levels of activity.  A quick glance at the 1-3Hz seismic trace in the control room will always settle the question of whether the trucks are hauling or not.    

We've built up a good bank of contacts related to site operations.  Feel free to email me any time if you have questions about the possibility of earth-shaking things occurring near LHO.

Comments related to this report

jeffrey.kissel@LIGO.ORG - 14:05, Saturday 21 February 2015 (16847)DetChar, PEM, SEI

Link

Dale -- is this a suggestion for a study? D'you have the past ~6 months worth of weekly reports from these contacts? If so, we can corroborate their reports against our seismic data to better quantify that when they say they're doing "X" on site in a given week, then we see "Y" amount of noise in the BLRMS channels (or "Z" amplitude in spectra) at these times of day.

This would be a fun DetChar exercise, and prove the point once and for all with a systematic study...

I ask because doing the opposite, namely, finding that the IFO is noisey, (asking / being able to prove) whether its because of the ground motion, and then remembering to ask you for "what's going on this week at the Hanford reservation?" is pretty tough.

(Unfortunately or thankfully, we don't have LLO's pleasure of proving that loggers surrounding the corner station to our "powerful new seismic defenses," are like mosquitoes are to a brick wall: see LLO aLOG 15797 or LLO aLOG 15634).