Journal
SCIENCE
Volume 331, Issue 6015, Pages 309-312Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1199375
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Funding
- NASA [NNH09AK41I]
- Directorate For Geosciences
- Division Of Earth Sciences [0732741] Funding Source: National Science Foundation
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Despite recent insight regarding the history and current state of the Moon from satellite sensing and analyses of limited Apollo-era seismic data, deficiencies remain in our understanding of the deep lunar interior. We reanalyzed Apollo lunar seismograms using array-processing methods to search for the presence of reflected and converted seismic energy from the core. Our results suggest the presence of a solid inner and fluid outer core, overlain by a partially molten boundary layer. The relative sizes of the inner and outer core suggest that the core is similar to 60% liquid by volume. Based on phase diagrams of iron alloys and the presence of partial melt, the core probably contains less than 6 weight % of lighter alloying components, which is consistent with a volatile-depleted interior.
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