000006234 001__ 6234
000006234 005__ 20230127115741.0
000006234 0247_ $$2DOI$$a10.1016/j.icarus.2022.115332
000006234 037__ $$aSCART-2023-0097
000006234 100__ $$aGenova, Antonio
000006234 245__ $$aRegional variations of Mercury's crustal density and porosity from MESSENGER gravity data
000006234 260__ $$c2023
000006234 520__ $$aA new solution of Mercury's gravity field to degree and order 160, named HgM009, is retrieved through a reprocessing of MESSENGER radio science measurements. By combining our latest gravity field with topography data, localized spectral admittance analyses are carried out to investigate Mercury's crustal and lithospheric properties across the northern hemisphere. The measured spectra are compared with admittances predicted by lithospheric flexure models. The localized gravity/topography admittance analyses yield key information on the lateral variations of the bulk density of the upper crust. Elastic and crustal thicknesses are also adjusted in our study, but the local admittance spectra allow us to constrain these parameters only over a few regions. The average bulk density across the observed areas in the northern hemisphere is 2540 ±60 kg m−3. The crustal porosity is then constrained by using an estimate of the pore-free grain density of surface materials with our measured bulk density. Our estimate of the mean porosity is 14.7 ±1.6 %, which is comparable to, but slightly higher than, the average value measured on the Moon. Larger crustal porosities are observed over heavily cratered regions, suggesting that impact bombardment is the main cause of the crustal porosity.
000006234 536__ $$aPRODEX program managed by ESA and BELSPO/$$cPRODEX program managed by ESA and BELSPO/$$fPRODEX program managed by ESA and BELSPO
000006234 594__ $$aNO
000006234 6531_ $$aMercury's crust
000006234 6531_ $$aGravity and topography admittance
000006234 6531_ $$aSurface porosity
000006234 6531_ $$aMESSENGER
000006234 700__ $$aGoossens, Sander
000006234 700__ $$aDel Vecchio, Edoardo
000006234 700__ $$aPetricca, Flavio
000006234 700__ $$aBeuthe, Mikael
000006234 700__ $$aWieczorek, Mark
000006234 700__ $$aChiarolanza, Gianluca
000006234 700__ $$adi Achille, Gaetano
000006234 700__ $$aMitri, Giuseppe
000006234 700__ $$aDi Stefano, Ivan
000006234 700__ $$aCharlier, Bernard
000006234 700__ $$aMazarico, Erwan
000006234 700__ $$aJames, Peter
000006234 773__ $$c1-16$$n115332$$pIcarus$$v391$$y2023
000006234 8560_ $$fmikael.beuthe@observatoire.be
000006234 85642 $$ahttps://www.sciencedirect.com/science/article/pii/S0019103522004249?via%3Dihub
000006234 905__ $$apublished in
000006234 980__ $$aREFERD