Mechanical loading-induced hydrate dissociation and its implications for submarine landslide initiation

This dataset contains the original experimental data supporting the findings reported in the manuscript entitled “Stress-induced hydrate dissociation and pore-fluid redistribution in hydrate-bearing sediments”. The data were obtained using a self-developed low-field nuclear magnetic resonance (LF-NMR) coupled with an in situ triaxial shear system. During triaxial loading and loading interruption, the system simultaneously monitored the mechanical response, transverse relaxation time (T₂) spectra, and magnetic resonance imaging (MRI) signals of hydrate-bearing sediment samples. The experiments were conducted under different hydrate saturation and effective confining pressure conditions to evaluate their effects on hydrate dissociation, pore-water redistribution, and fluid migration behavior. The dataset includes: (1) calibration data of standard water-content samples used to establish the relationship between LF-NMR signal intensity and liquid water content (Raw data of Fig. S1); (2) Curves of stress-strain, T₂ spectral and calculated water-content evolution during staged and continuous shearing (Raw data of Fig. 2); (3) axial MRI data showing spatial redistribution of pore water during shear deformation under different hydrate saturation and effective confining pressure conditions (Raw data of Fig. 3 and Fig. S2). nstrate the stress-driven cycle of hydrate dissociation, pore-fluid migration, and hydrate reformation in hydrate-bearing sediments. The dataset can be further used for quantitative analysis of coupled mechanical deformation, hydrate phase transition, and pore-fluid redistribution processes in marine hydrate systems.