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Fig. 5 | Earth, Planets and Space

Fig. 5

From: Monitoring the instrument response of the high-sensitivity seismograph network in Japan (Hi-net): effects of response changes on seismic interferometry analysis

Fig. 5

Temporal changes in the instrumental parameters from 2003 to 2013. a Vertical components of (a1) the natural frequency f Hz of the test signal at the N.KMIH station, (a2) the damping constant h, and (a3) the rr and the peak (broken line) and RMS (dot) amplitudes 3 s before the test signal. b North–south and c east–west components of the variables in (a). The arrows indicate the dates of the Iwate–Miyagi Nairiku Earthquake in 2008 and the 2011 Tohoku-Oki earthquake

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