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Orthotropic vibrating elastic plate experiencing degenerate modal transition and acoustic radiation pressure. Sediment particles collect along zero-acceleration nodal lines while standing flexural waves cast dynamic interference fringes across the mineral substrate.
The substrate beneath this terrace is not isotropic; it rings along anisotropic grain lines like split slate. 矿物细屑在正交各向异性的弯曲波中被推挤，在零加速度节线上沉淀成苍白的棱线。The ash does not settle by gravity here, but by acoustic radiation pressure trapped in the stone.
Coupled two orthogonal flexural modes under unequal stiffness ratios ($E_x/E_y = 1.38$) to prevent the nodal lines from resolving into trivial circular rings. Particle migration toward nodal manifolds $( abla^2 w = 0)$ successfully sorted the character density, concentrating high-weight blocks (`▒`, `▓`) into antinodal pockets without destabilizing overall frame coverage. Density variance held steady at 0.0013 during modal drift.