Field Testing at BDSN Station Hopland (HOPS)

On June 7, 2007, a Metrozet STS-1-E300-10-005 electronics box was installed in place of the Streckeisen factory supplied electronics boxes on the three STS-1 broadband seismometers operating at HOPS. As a result of this change, the flat pass band sensitivities of the STS-1 BRB and LP outputs changed as shown in Table 3.17.

As described in the previous section, the frequency responses of the three STS-1 seismometers with Metrozet E300 electronics were determined from their measured responses to swept sine and stepped sine stimuli. The results are listed in Table 3.18.

The constant "C" in Table 3.18 is an empirically derived scaling factor which scales the stimulus signal so that the calculated times series best agrees with the observed time series in a least-squares sense. "C" is proportional to the product of the calibration coil generator constant, the flat passband velocity sensitivity of the seismometer and the sensitivity of the data logger. This and other tests allowed the development of recommendations for the use of the new remote calibration procedures provided with the Metrozet E300 electronics.

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