Fig. 4: Secular variation in slab-derived water.
From: Hot springs reflect the flooding of slab-derived water as a trigger of earthquakes
a Variation in the fraction of slab-derived water (Fsdw) in the seven hot springs (AR1-AR7). Colored symbols outlined (non-outlined) in black show estimations from isotope (Cl) data. Approximated, exponential asymptotic curves (excluding AR7) are given as colored solid lines. Open symbols represent two outliers that are not used for the approximation. Error bars represent non-systematic uncertainties given by Eq. (9) in “Methods”, and dashed vertical line shows the year of the Kobe earthquake occurrence. Colored dotted-lines represent the maximum estimated Fsdw after the earthquake as the lower limits of interpolated Fsdw at the former part of period III. Figures for each spring are given as Supplementary Fig. 1. b Variation of total outflow of slab-derived water through seven hot springs. Components of steady inflow, pre-existing (computed using Eq. (13) with the reservoir capacity, V, for Period I), and episodic replenishment (as residual) are shown. Dotted line represents the lower limits of the estimated total outflow.
