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Fig. 1 | Earth, Planets and Space

Fig. 1

From: Comment on “Spatial changes in inclusion band spacing as an indicator of temporal changes in slow slip and tremor recurrence intervals” by Nishiyama et al.

Fig. 1

Plot showing estimated pore-fluid pressures from Nishiyama et al.’s Fig. 4j without uncertainty as presented by Nishiyama et al. (left, green), with associated uncertainties determined (but not reported) by Nishiyama et al. (center, yellow), and with associated uncertainties suggested in a systematic analysis of liquid-volume fraction estimates by Bakker and Diamond (2006) (right, purple). Gray line shows the slip-induced decrease in pore-fluid pressure (ΔP) inferred by Nishiyama et al. based on the raw data. Note the discontinuous vertical axis above pressures of 350 MPa. When reasonable uncertainties in the estimated liquid-volume fractions are considered, the upper bound pressure estimate (which is inferred by Nishiyama et al. to record vein formation under lithostatic conditions) is indistinguishable from their estimate of the hydrostatic pressure at 15 km depth. Thus, when combined with an assumed minimum pressure consistent with hydrostatic conditions (as Nishiyama et al. argue), an interpretation of ΔP ≈ 0 is permissible

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