Constraining the lunar crustal thickness with seismology and gravity

Details Constraining the lunar crustal thickness with seismology and gravity Constraining the lunar crustal thickness with seismology and gravity

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....1780c&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #1780

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During the seventies, the Apollo missions set up a seismic network on the nearside of the Moon, which allowed to address the fondamental 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 mean crustal thickness. Our work first consisted of reprocessing the whole set of data, and then to perform a new independent analysis on arrival times. This inversion resulted in a new view of the seismic velocity distribution with depth, especially characterised by a much thinner crust : the mantle velocities are reached from 30 km deep instead of 60 km in old studies. This is coherent with our study of receiver functions, which highlighted precursor arrivals related to S-to-P wave conversions at the curst-mantle boundary. In the other hand, crustal thickness modelisations from gravity data have a global coverage and show important lateral variations. The problem is that gravity inversion deals with non-unique solutions and need to be anchored on one point. By exploring crustal models for the impact sites and the seismic stations, we constrain the thickness of different locations on the lunar surface. These constraints are used to invert the gravity dataset. We present here the different aspects and results of this joint study of seismology and gravity data.

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