Reports until 16:41, Thursday 20 July 2017
H1 ISC
kiwamu.izumi@LIGO.ORG - posted 16:41, Thursday 20 July 2017 - last comment - 14:26, Friday 21 July 2017(37664)
OMC length and test mass oplevs: unlikely to be culprit for low frequency excess

The attached are comparison of the OMC length and oplev spectra before (4/7/2017 12:30 UTC) and after (today; 20/7/2017 21:00 UTC) the Montana earthquake.

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kiwamu.izumi@LIGO.ORG - 14:26, Friday 21 July 2017 (37685)

The attached are the spectra of the BS, PR3 and SR3 oplevs, comparing before and after the earthquake. Again I don't see any suspicious changes except that the BS PIT noise floor improved by a few dB for some reason after the earthquake.

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