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. 2020 Oct 9;11:5087. doi: 10.1038/s41467-020-18899-3

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© The Author(s) 2020

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Fig. 7 — Schematic model showing how gas emissions may be affected by tides through fracture opening. a At high tides the system is under a balanced pressure field. b At low tides (<1 m water column height decrease) a subtle fracture dilation would shift the pressure field to favor gas advection and seepage. P_g stands for free gas pressure.