We present evidence for significant deviations of the true instrument gain from that reported for several modern broad-band permanent seismograph stations. Our result derives from a systematic comparison of observed and synthetic long-period seismograms for approximately 600 large earthquakes. Seismograms were collected from globally distributed stations and analyzed using the centroid-moment-tensor (CMT) algorithm for estimating earthquake parameters. Following the source inversion, synthetic seismograms corresponding to the final earthquake parameters were compared with the observed seismograms and an optimal amplitude-scaling coefficient for each seismogram was determined. Scaling coefficients for earthquakes occurring in a given calendar year were then averaged to investigate...
Observations of Time-dependent Errors in Long-period Instrument Gain at Global Seismic Stations
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Göran Ekström, Colleen A. Dalton, Meredith Nettles; Observations of Time-dependent Errors in Long-period Instrument Gain at Global Seismic Stations. Seismological Research Letters ; 77 (1): 12–22. doi: https://doi.org/10.1785/gssrl.77.1.12
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