Ground-Coupled Seismic Bass — Rayleigh Wave + Floor Slab Transmission + ISO 2631 Whole-Body Vibration

Vehicle subwoofer at 7 Hz generates Rayleigh ground waves (cylindrical spreading −3 dB per doubling distance vs −6 dB for airborne). At 50m: 17 dB stronger than airborne path. Floor slab couples wave to building structure. ISO 2631-1: human body most sensitive at 4–8 Hz whole-body vibration. Standing wave pattern in building. Nausea onset 15–25 min at discomfort threshold. Plantar arch → femur → spine → pelvis transmission chain.

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