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Rigid Bodies as Accidental Seismoscopes: Exact Time Stepper Inversion and an Estimate of Ground Acceleration in the 2026 La Guaira Earthquake
An unknown ground excitation is recovered from the measured response of a rigid body sliding in two dimensions on an inclined surface under Coulomb friction, a system with no classical solution, whose sampled trajectories come from a time stepper. The Moreau stepper is shown to admit an exact invers
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