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The Lunar Geophysical Network Mission

Neal, C. and Weber, Renee and Banerdt, B. and Beghein, C. and Chi, P. J. and Currier, N. and Dell'Agnello, Simone and Garcia, Raphaël F. and Garrick-Bethell, I. and Grimm, R. and Grott, Matthias and Haviland, H. and Kawamura, T. and Kedar, S. and Lognonne, P. and Nagihara, S. and Nakamura, Y. and Nunn, C. and Ostrach, L. R. and Petro, N. and Schmerr, N. and Siegler, M.A. and Watters, T. R. and Wieczorek, M. and Zacny, K. and Panning, M. (2019) The Lunar Geophysical Network Mission. AGU Fall Meeting, 9.12.-13.12.2019, San Francisco.

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Official URL: https://agu.confex.com/agu/fm19/meetingapp.cgi/Paper/601457


In 2007, the National Academies designated “understanding the structure & composition of the lunar interior” (to provide fundamental information on the evolution of a differentiated planetary body) as the second highest lunar science priority that needed to be addressed. Here we present the current status of the planned response of the Lunar Geophysical Network (LGN) team to the upcoming New Frontiers-5 AO. The Moon represents an end-member in the differentiation of rocky planetary bodies. Its small size (and heat budget) means that the early stages of differentiation have been frozen in time. But despite the success of the Apollo Lunar Surface Experiment Package (ALSEP), significant unresolved questions remain regarding the nature of the lunar interior and tectonic activity. General models of the processes that formed the present-day lunar interior are currently being challenged. While reinterpretation of the Apollo seismic data has led to the identification of a lunar core, it has also produced a thinning of the nearside lunar crust from 60-65 km in 1974 to 30-38 km today. With regard to the deep mantle, Apollo seismic data have been used to infer the presence of garnet below ~500 km, but the same data have also been used to identify Mg-rich olivine. A long-lived global lunar geophysical network (seismometer, heat flow probe, magnetometer, laser retro-reflector) is essential to defining the nature of the lunar interior and exploring the early stages of terrestrial planet evolution, add tremendous value to the GRAIL and SELENE gravity data, and allow other nodes to be added over time (ie, deliver the International Lunar Network). Identification of lateral and vertical heterogeneities, if present within the Moon, will yield important information about the early presence of a global lunar magma ocean (LMO) as well as exploring LMO cumulate overturn. LGN would also provide new constraints on seismicity, including shallow moonquakes (the largest type identified by ALSEP with magnitudes between 5-6) that have been linked to young thrust fault scarps, suggesting current tectonic activity. Advancing our understanding of the Moon’s interior is critical for addressing these and many other important lunar and Solar System science and exploration questions, including protection of astronauts from the strong shallow moonquakes.

Item URL in elib:https://elib.dlr.de/132737/
Document Type:Conference or Workshop Item (Poster)
Title:The Lunar Geophysical Network Mission
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Neal, C.University of Notre Dame, United StatesUNSPECIFIED
Banerdt, B.jet propulsion laboratory, pasadena, ca, usaUNSPECIFIED
Chi, P. J.Earth Planetary and Space Sciences, University of California, Los Angeles, CA, USAUNSPECIFIED
Currier, N.Center for Radiophysics and Space Reseach, Cornell University, Ithaca, NY, USAUNSPECIFIED
Dell'Agnello, SimoneLaboratori Nazionali di Frascati dell’INFNUNSPECIFIED
Garcia, Raphaël F.Institut Supérieur de l’Aéronautique et de l’Espace (ISAE-SUPAERO), Université de Toulouse, 31400 Toulouse, FranceUNSPECIFIED
Garrick-Bethell, I.UC Santa CruzUNSPECIFIED
Grimm, R.Southwest Research Institute, United StatesUNSPECIFIED
Grott, MatthiasMatthias.Grott (at) dlr.deUNSPECIFIED
Kawamura, T.institut de physique du globe de paris, paris, francehttps://orcid.org/0000-0001-5246-5561
Kedar, S.jet propulsion laboratory, pasadena, ca, usaUNSPECIFIED
Lognonne, P.IPGP, Paris (F)UNSPECIFIED
Nagihara, S.Texas Tech Univ.UNSPECIFIED
Nakamura, Y.Inst. for Geophysics, Univ. of Texas, Austin, TX, USAUNSPECIFIED
Nunn, C.Jet Propulsion Laboratory, California Institute of TechnologyUNSPECIFIED
Ostrach, L. R.School of Earth and Space Exploration, Arizona State University, Tempe, AZ, USAUNSPECIFIED
Petro, N.NASA Goddard Space Flight Center,Greenbelt, MD 20771 USAUNSPECIFIED
Schmerr, N.Department of Geology, University of Maryland, College Park, USAUNSPECIFIED
Siegler, M.A.Southern Methodist University, Dallas, Texas, USAUNSPECIFIED
Watters, T. R.Center for Earth and Planetary Studies, National Air and Space Museum, Smithsonian Institution, Washington, DC 20560 United StatesUNSPECIFIED
Wieczorek, M.Observatoire de la Côte d’Azur, Laboratoire LagrangeUNSPECIFIED
Zacny, K.Honeybee RoboticsUNSPECIFIED
Panning, M.Jet Propulsion LaboratoryCalifornia Institute of TechnologyPasadenaUSAUNSPECIFIED
Date:December 2019
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Moon Geophysics Heat Flow Missions
Event Title:AGU Fall Meeting
Event Location:San Francisco
Event Type:international Conference
Event Dates:9.12.-13.12.2019
Organizer:American Geophysical Union
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):Project InSight HP3, R - Vorhaben Exploration des Sonnensystems
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Physics
Deposited By: Grott, Dr.rer.nat. Matthias
Deposited On:13 Dec 2019 10:17
Last Modified:13 Dec 2019 10:17

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