Seismic Detection of the Lunar Core | INSTITUT DE PHYSIQUE DU GLOBE DE PARIS

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  Seismic Detection of the Lunar Core

Type de publication:

Journal Article

Source:

Science, Volume 331, Ticket 6015, p.309-312 (2011)

ISBN:

0036-8075

Numéro d'accès:

ISI:000286636300030

URL:

http://www.sciencemag.org/content/331/6015/309

Mots-clés:

Géophysique spatiale et planétaire, UMR 7154

Résumé:

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.

Notes:

Weber, Renee C. Lin, Pei-Ying Garnero, Edward J. Williams, Quentin Lognonne, Philippe