000005410 001__ 5410
000005410 005__ 20210726102928.0
000005410 0247_ $$2DOI$$a10.1126/science.abf8966
000005410 037__ $$aSCART-2021-0112
000005410 100__ $$aKnapmeyer-Endrun, Brigitte 
000005410 245__ $$aThickness and structure of the martian crust from InSight seismic data
000005410 260__ $$c2021
000005410 520__ $$aBecause of the lack of direct seismic observations, the interior structure of Mars has been a mystery. Khan et al., Knapmeyer-Endrun et al., and Stähler et al. used recently detected marsquakes from the seismometer deployed during the InSight mission to map the interior of Mars (see the Perspective by Cottaar and Koelemeijer). Mars likely has a 24- to 72-kilometer-thick crust with a very deep lithosphere close to 500 kilometers. Similar to the Earth, a low-velocity layer probably exists beneath the lithosphere. The crust of Mars is likely highly enriched in radioactive elements that help to heat this layer at the expense of the interior. The core of Mars is liquid and large, ∼1830 kilometers, which means that the mantle has only one rocky layer rather than two like the Earth has. These results provide a preliminary structure of Mars that helps to constrain the different theories explaining the chemistry and internal dynamics of the planet.Science, abf2966, abf8966, abi7730, this issue p. 434, p. 438, p. 443 see also abj8914, p. 388A planet’s crust bears witness to the history of planetary formation and evolution, but for Mars, no absolute measurement of crustal thickness has been available. Here, we determine the structure of the crust beneath the InSight landing site on Mars using both marsquake recordings and the ambient wavefield. By analyzing seismic phases that are reflected and converted at subsurface interfaces, we find that the observations are consistent with models with at least two and possibly three interfaces. If the second interface is the boundary of the crust, the thickness is 20 ±5 kilometers, whereas if the third interface is the boundary, the thickness is 39 ±8 kilometers. Global maps of gravity and topography allow extrapolation of this point measurement to the whole planet, showing that the average thickness of the martian crust lies between 24 and 72 kilometers. Independent bulk composition and geodynamic constraints show that the thicker model is consistent with the abundances of crustal heat-producing elements observed for the shallow surface, whereas the thinner model requires greater concentration at depth.
000005410 594__ $$aNO
000005410 700__ $$aPanning, Mark P. 
000005410 700__ $$aBissig, Felix 
000005410 700__ $$aJoshi, Rakshit 
000005410 700__ $$aKhan, Amir 
000005410 700__ $$aKim, Doyeon 
000005410 700__ $$aLekić, Vedran 
000005410 700__ $$aTauzin, Benoit 
000005410 700__ $$aTharimena, Saikiran 
000005410 700__ $$aPlasman, Matthieu 
000005410 700__ $$aCompaire, Nicolas 
000005410 700__ $$aGarcia, Raphael F. 
000005410 700__ $$aMargerin, Ludovic 
000005410 700__ $$aSchimmel, Martin 
000005410 700__ $$aStutzmann, Éléonore 
000005410 700__ $$aSchmerr, Nicholas 
000005410 700__ $$aBozdağ, Ebru 
000005410 700__ $$aPlesa, Ana-Catalina 
000005410 700__ $$aWieczorek, Mark A. 
000005410 700__ $$aBroquet, Adrien 
000005410 700__ $$aAntonangeli, Daniele 
000005410 700__ $$aMcLennan, Scott M. 
000005410 700__ $$aSamuel, Henri 
000005410 700__ $$aMichaut, Chloé 
000005410 700__ $$aPan, Lu 
000005410 700__ $$aSmrekar, Suzanne E. 
000005410 700__ $$aJohnson, Catherine L. 
000005410 700__ $$aBrinkman, Nienke 
000005410 700__ $$aMittelholz, Anna 
000005410 700__ $$aRivoldini, Attilio 
000005410 700__ $$aDavis, Paul M. 
000005410 700__ $$aLognonné, Philippe 
000005410 700__ $$aPinot, Baptiste 
000005410 700__ $$aScholz, John-Robert 
000005410 700__ $$aStähler, Simon 
000005410 700__ $$aKnapmeyer, Martin 
000005410 700__ $$avan Driel, Martin 
000005410 700__ $$aGiardini, Domenico 
000005410 700__ $$aBanerdt, W. Bruce
000005410 773__ $$n6553$$pScience$$v373$$y2021
000005410 8560_ $$fattilio.rivoldini@observatoire.be
000005410 8564_ $$s6570804$$uhttp://publi2-as.oma.be/record/5410/files/Knapmeyer-Endrun2021vo00.pdf
000005410 8564_ $$s833043$$uhttp://publi2-as.oma.be/record/5410/files/Knapmeyer-Endrun2021vo22.pdf
000005410 8564_ $$s10649$$uhttp://publi2-as.oma.be/record/5410/files/Knapmeyer-Endrun2021vo00.jpg?subformat=icon-180$$xicon-180
000005410 8564_ $$s21272$$uhttp://publi2-as.oma.be/record/5410/files/Knapmeyer-Endrun2021vo22.jpg?subformat=icon-180$$xicon-180
000005410 8564_ $$s22165$$uhttp://publi2-as.oma.be/record/5410/files/Knapmeyer-Endrun2021vo22.gif?subformat=icon$$xicon
000005410 8564_ $$s7926$$uhttp://publi2-as.oma.be/record/5410/files/Knapmeyer-Endrun2021vo00.gif?subformat=icon$$xicon
000005410 905__ $$apublished in
000005410 980__ $$aREFERD