Fig. 7
From: Precise tilt measurement by seafloor borehole tiltmeters at the Nankai Trough subduction zone
Results of the load experiments and their theoretical responses. a Tilt variations during the load experiment. Tilt variation in the X and Y direction of the sensor of the tiltmeter during the load experiment are shown for the pendulum (upper panel) and electrolytic (lower panel) tiltmeters. Gray and red shadows indicate periods when the ROV touched down and left the 120 kg of mass on the seafloor, respectively. Solid and dashed lines show tilt variations with low pass filter below 100 s and 6 h, respectively. Red dashed lines in the red periods show best-fit offsets (tilt changes of the load experiments shown in Table 1). b The theoretical load response for a half-space elastic medium at the most sensitive positions is shown with several elastic parameters (lines colored by VS) and the results of the experiment (circles). The curves were calculated assuming a density and VP of 1300 kg/m3 and 1600 m/s, respectively