Edward J. Garnero coauthored a test of the Moon's interior using seismic attenuation, tidal dissipation and Love numbers. The calculation asked whether melt-free mantle material could reproduce several independent observations.[ref]
Dissipation at tidal and seismic frequencies in a melt-free Moon by Francis Nimmo and others. Abstract: joint dissipation and tidal-response constraints
Attenuation depends on forcing frequency and material relaxation, so a large energy loss need not uniquely imply a liquid layer.
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