Gravitational Potential Delay and Effective Propagation Velocity in Dense Cosmic Media: Empirical Validation via Seismic Resonance Residuals

Short Communication: Gravitational potential field is physically delayed due to effective energy density of cosmic medium, exhibiting propagation characteristic identical to electromagnetic waves. This communication demonstrates that observed phase delay period (Tr = 299.86 s) and residual delay angle (δ* ≈ 0.012 rad) in global seismic time series across multiple GLOF events are direct empirical consequences of a delayed gravitational potential field governed by effective refractive index n = 1.0041. Theory:- Standard GR: c_eff = c/n (Eq.1), n>1 due to mass-energy density ρ- Mach angle relation in effective medium n=1.0041 modifies phase boundary by Snell-Gravitational law: sin(μ_obs)=sin(μ_theory)/n=(2/3)/1.0041≈0.6639 (Eq.2)- Angle difference Δμ=41.8103°-41.6667°=0.1436°, theoretical vacuum escape/Mach angle μ_theory=41.81° → observed energy quality factor angle μ_obs=41.66° Empirical validation (IRIS Wilber 3):- South Lhonak GLOF (2023) Sikkim, India: Tr=299.86 s (±0.3 s), δ*=0.01201 rad- Chorabari GLOF (2013) Kedarnath, India: Tr=299.86 s (±0.3 s), δ*=0.01198 rad- Jinwuco GLOF (2022) Tibet, China: Tr=299.86 s (±0.3 s), δ*=0.01202 radStrict mode consistency proves ~300s phase lag is not local hydrological artifact, but physical manifestation of delayed gravitational potential field closing integer-ratio resonance envelope (6×6×50). Conclusion: Light and gravitational potential fields share identical physical nature regarding medium-induced velocity retardation (c_eff=c/n). Empirical agreement with GLOF seismic residuals confirms Earth's dynamic equilibrium is bound to delayed gravitational potential field (δ*≈0.012 rad). Related to Zenodo 23771498 (integrated final), 23761553 (geometric proof), 23763231 (gas giant waveguide), EGUSPHERE-2026-6657. DOI: 10.5281/zenodo.23776539