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Fig. 1 | Earth, Planets and Space

Fig. 1

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

Fig. 1

Epicenter and Hi-net station locations and waveform examples. a Distribution of the NIED Hi-net stations and the epicenter of the 2011 Tohoku-Oki earthquake. Vertical waveforms of the 2011 Tohoku-Oki earthquake recorded at the N.KMIH (IWTH23) station with b the KiK-net borehole acceleration seismometer and c the Hi-net velocity seismometer. Both seismometers were placed in the same borehole. Band-pass filters of 0.01–20 Hz were applied to the waveforms, and they were transformed to displacements. The dashed line indicates the reliable stroke width (±15 mm) of the Hi-net vertical sensor (Shiomi et al. 2005)

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