Seismological data provides essential constraints on the velocity structure, elastic properties, size, and compositional makeup of Earth's inner core.
The claim states that seismological data determines the size and composition of Earth's inner core. Multiple retrieved papers directly support this by showing how seismic waves (such as body waves, normal modes, and shear wave velocities) are modeled and inverted to infer inner core properties, boundaries, and chemical composition (including alloy structures). There are no refuting papers.