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Fig. 7 | Earth, Planets and Space

Fig. 7

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

Fig. 7

Autocorrelation functions (ACFs) and noise level. a ACFs of the vertical component for the N.KMIH station. The ACFs were made from band-pass-filtered waveforms (passband = 1–3 Hz). The broken line indicates the date of the 2011 Tohoku-Oki earthquake. b Root mean square amplitude of waveforms for the duration of 1 h after band-pass filtering

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