Fig. 3From: Precise tilt measurement by seafloor borehole tiltmeters at the Nankai Trough subduction zoneTilt variations in the two tiltmeters since installation. The blue and black lines show the electrolytic and pendulum tiltmeters, respectively. Gaps in the data indicate the lack of data due to troubles with the data acquisition system. Vertical spikes in tilt variations show earthquake signalsBack to article page