USP Field Theory: A Structure-Selected Interpretation of the ~26-Second Earth Microseism

This work presents a testable reinterpretation of the persistent ~26-second Earth microseism within the framework of USP Field Theory. Rather than attributing the signal solely to ocean-wave forcing, the model introduces a driver–selector mechanism in which ocean dynamics provide broadband excitation while the Earth system partially selects a preferred dissipation frequency through a Δf relaxation corridor. The study defines operational stability metrics, including a dimensionless selector parameter and a quality factor, and proposes concrete observational tests using global seismic networks, ocean wave datasets, and tidal indices. A statistical framework is introduced to separate driver-dominated behavior from structure-selected modulation, including mixed-model regression and coherence analysis. A minimal first-order scaling proxy is provided to connect Earth–Moon detuning to corridor-scale frequency selection, while explicitly acknowledging that a full quantitative mapping remains an open problem. The framework further integrates with prior USP coherence and decay formulations, ensuring consistency across previously developed physical systems. The model yields falsifiable predictions, including frequency stability under varying ocean conditions, partial lunar modulation of amplitude or coherence, enhanced global coherence, and the possible presence of secondary relaxation bands. This work does not replace the standard ocean-wave explanation but extends it by introducing a structural selection mechanism, offering a unified and testable interpretation of microseism behavior.