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Fig. 2 | Earth, Planets and Space

Fig. 2

From: Weak faults at megathrust plate boundary respond to tidal stress

Fig. 2

Ambient noise field during the drilling project. a Geometry of D/V Chikyu, OBS04, and borehole sensor. b Rotation per minute (RPM) of drill-bit during the drilling project. The vertical axis is time over a 1-day period. c The blue, black, and red dots represent the locations of the front, center, and back parts of the Chikyu during the Julian days 1–58 in 2019. d Waveforms of (from top to bottom) ZZ-CCF (cross correlation function) for RPM = 0, TT-CCF for RPM = 0, ZZ-CCF for RPM = 32, and TT-CCF for RPM = 32. The reference site of the CCFs is OBS04, and indicates that peaks at positive/negative lag time are downgoing/upgoing waves

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