DMC: Knowledge Base: Question: Do the USArray TA data contain calibration signals?

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Do the USArray TA data contain calibration signals?

webmaster  staff  Nov. 13, 2013, 3:40 p.m.

Do the USArray TA data contain calibration signals? If so, when and where are they? What do they look like?


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Gillian Sharer  accepted answer  staff  Nov. 13, 2013, 3:46 p.m.

Calibrations on USArray TA data are run within a few days to weeks both after sensor installation and before sensor removal (if possible). The signal looks like large amplitude white noise with an abrupt start and end and lasts for about 2 hours. Two examples are illustrated below:

Calibration of TA.X47A

Figure 1: Calibration response on BH* channels of TA.X47A on 2011-12-16 14:25:39 UTC.

Calibration of TA.237A

Figure 2: Calibration response on LH* channels of TA.237A on 2011-12-12 16:16:51 UTC.