Fig. 2From: Monitoring the instrument response of the high-sensitivity seismograph network in Japan (Hi-net): effects of response changes on seismic interferometry analysisEquivalent circles and instrument response. a Schematic of a typical Hi-net seismometer, b the voltage used as an input for the test signal, and c the velocity of the coil bobbin relative to the magnet as a result of the input shown in (b). We refer to this waveform as the instrument response or test signalBack to article page