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Additional file 1: Figure S1. Parameters for Chikyu on November 20, 2018. a Temporal variation of depth of the drill-bit from the sea surface. The water depth is around 2,000 m. b Temporal variation of RPM (rotation per minute). c Schematic for the geometry of two sensors, drill-bit, and the stationary zones. Figure S2. Transverse-deconvolved waveforms (TDWs) at each OBS. (a–e) Same as Figures 4b and CC in 4d, but for a OBS01, b OBS02, c OBS04, d OBS05, and e OBS06. Figure S3. Location of the center position of Chikyu and the stability of the TDWs. a Dots indicate the center position of Chikyu, which are the same as those in Fig. 2c. Red circle represents the radius of 1 m from the central location of dots. Regions are divided into eight regions; A: 1 quadrant inside 1 m, B: 2 quadrant inside 1 m, C: 3 quadrant inside 1 m, D: 4 quadrant inside 1 m, E: 1 quadrant outside 1 m, F: 2 quadrant outside 1 m, G: 3 quadrant outside 1 m, H: 4 quadrant outside 1 m. b Histogram for the Chikyu positions in the four-quadrant. The position was measured at each minute, and the number of 1-min segment during 1–57 Julian days in 2019 was counted. c (top) Waveforms at OBS03 in which the TDWs are stacked during 1–57 Julian days when the Chikyu is located in the region (black) A, (red) B, (blue) C, and (light-blue) D. (bottom) Same as the top panel, but for the region (black) E, (red) F, (blue) G, and (light-blue) H. Figure S4. Envelope functions at high and low tide. a Same as Fig. 6a, with uncertainties in pink and gray lines for the other OBSs. Arrows indicate large amplitudes at high tide at lag times between 5.5 and 7.5 s. b Same as Fig. 6b, but for OBS06. |
