HR: 08:00h
AN: P11A-01    [PDF]
TI: Lateral Heterogeneities of the Lunar Crustal Thickness
AU: * Chenet, H
EM: chenet@ipgp.jussieu.fr
AF: DGSP/IPGP, 4 av. Neptune, Saint-Maur, 94107 France
AU: Lognonne, P
EM: lognonne@ipgp.jussieu.fr
AF: DGSP/IPGP, 4 av. Neptune, Saint-Maur, 94107 France
AU: Wieczorek, M
EM: wieczor@ipgp.jussieu.fr
AF: DGSP/IPGP, 4 av. Neptune, Saint-Maur, 94107 France
AU: Mizutani, H
EM: mizutani@planeta.sci.isas.ac.jp
AF: ISAS, Yoshinodai 3-1-1, Sagamihara, Kan 229-8510 Japan
AB: During the seventies, the Apollo missions set up a seismic network on the nearside of the Moon, which allowed to address the fundamental questions of lunar science. Recently this dataset was reinvestigated in order to shed light on ambiguous results of ancient studies. One of them was the proposed 60 km crustal thickness below the Apollo station 12 and 14 sites. Our previous study achieved a new view of the lunar interior where the lunar crust, as seen by the Apollo seismic data, is 30 km thick. Lateral variations of crustal thickness can be determined from inversions of gravity and topography data. These inversions must be anchored at a single point, with a seismic determination. This present work goes further. In this study, we constrain lateral variations of crustal thickness with seismic data only. We use a Markov-Chain Monte-Carlo method to invert for the lateral crustal thickness, determined by the arrival times of impacts at the 4 Apollo stations. Each impact and station site is associated to an independent Moho depth. The topography of the different sites, as determined by Zuber et al. (1994) whith the Clementine dataset, is also taken into account for the first time. Thus, we put independent seismological constraints on the Moho depth at 31 locations, instead of one. We present here the preliminary results of this study of lunar crustal thickness heterogeneities, in terms of an integrated view of the seismic and gravity information.
DE: 1221 Lunar geodesy and gravity (6250)
DE: 1734 Seismology
DE: 6250 Moon (1221)
DE: 8147 Planetary interiors (5430, 5724)
SC: Planetary Sciences [P]
MN: 2003 Fall Meeting