000005564 001__ 5564
000005564 005__ 20220120122339.0
000005564 037__ $$aCTALK-2022-0012
000005564 100__ $$aStaehler, Simon C
000005564 245__ $$aThe interior of Mars as seen by InSight
000005564 260__ $$c2021
000005564 269__ $$c2021-12-19
000005564 520__ $$aInSight is the first planetary mission dedicated to exploring the whole interior of a planet using geophysical methods, specifically seismology and geodesy. To this end, we observed seismic waves of distant marsquakes and inverted for interior models using differential travel times of phases reflected at the surface (PP, SS...) or the core mantle-boundary (ScS), as well as those converted at crustal interfaces. Compared to previous orbital observations1-3, the seismic data added decisive new insights with consequences for the formation of Mars: The global average crustal thickness of 24-75 km is at the low end of pre-mission estimates5. Together with the the thick lithosphere of 450-600 km5, this requires an enrichment of heat-producing elements in the crust by a factor of 13-20, compared to the primitive mantle. The iron-rich liquid core is 1790-1870 km in radius6, which rules out the existence of an insulating bridgmanite-dominated lower mantle on Mars. The large, and therefore low-density core needs a high amount of light elements. Given the geochemical boundary conditions, Sulfur alone cannot explain the estimated density of ~6 g/cm3 and volatile elements, such as oxygen, carbon or hydrogen are needed in significant amounts. This observation is difficult to reconcile with classical models of late formation from the same material as Earth. We also give an overview of open questions after three years of InSight operation on the surface of Mars, such as the potential existence of an inner core or compositional layers above the CMB.
000005564 536__ $$a3PRODPLANINT/$$c3PRODPLANINT/$$f3PRODPLANINT
000005564 594__ $$aNO
000005564 6531_ $$aMars, core, SEIS, quake, InSight
000005564 700__ $$aKhan, Amir
000005564 700__ $$aKnapmeyer-Endrun, Brigitte
000005564 700__ $$aPanning, Mark P
000005564 700__ $$aBanerdt, William Bruce
000005564 700__ $$aLognonné, Philippe Henri
000005564 700__ $$aGiardini, Domenico
000005564 700__ $$aAntonangeli, Daniele
000005564 700__ $$aBeucler, Eric
000005564 700__ $$aBissig, Felix
000005564 700__ $$aBozdag, Ebru
000005564 700__ $$aBrinkman, Nienke
000005564 700__ $$aCeylan, Savas
000005564 700__ $$aCharalambous, Constantinos
000005564 700__ $$aClinton, John F.
000005564 700__ $$aCompaire, Nicolas
000005564 700__ $$aDahmen, Nikolaj L
000005564 700__ $$aDavis, Paul Mcewan
000005564 700__ $$aDriel, Martin van
000005564 700__ $$aDrilleau, Melanie
000005564 700__ $$aGarcia, Raphael F.
000005564 700__ $$aHuang, Quancheng
000005564 700__ $$aJoshi, Rakshit
000005564 700__ $$aGudkova, Tamara
000005564 700__ $$aIrving, Jessica
000005564 700__ $$aJohnson, Catherine
000005564 700__ $$aKawamura, Taichi
000005564 700__ $$aKim, Doyeon
000005564 700__ $$aKnapmeyer, Martin
000005564 700__ $$aMaguire, Ross
000005564 700__ $$aLekic, Vedran
000005564 700__ $$aMargerin, Ludovic
000005564 700__ $$aMarusiak, Angela G
000005564 700__ $$aMcLennan, Scott M
000005564 700__ $$aMittelholz, Anna
000005564 700__ $$aMichaut, Chloe
000005564 700__ $$aPlasman, Matthieu
000005564 700__ $$aPan, Lu
000005564 700__ $$aDuran, Cecilia
000005564 700__ $$aPerrin, Clement
000005564 700__ $$aPike, William T
000005564 700__ $$aPlesa, Ana-Catalina
000005564 700__ $$aPinot, Baptiste
000005564 700__ $$aRivoldini, Attilio
000005564 700__ $$aScholz, John-Robert
000005564 700__ $$aSchimmel, Martin
000005564 700__ $$aSchmerr, Nicholas C
000005564 700__ $$aStutzmann, Eleonore
000005564 700__ $$aSamuel, Henri
000005564 700__ $$aSmrekar, Suzanne
000005564 700__ $$aSpohn, Tilman
000005564 700__ $$aTauzin, Benoit
000005564 700__ $$aTharimena, Saikiran
000005564 700__ $$aWidmer-Schnidrig, Rudolf
000005564 700__ $$aWieczorek, Mark
000005564 700__ $$aXu, Zongbo
000005564 700__ $$aZenhäusern, Géraldine
000005564 700__ $$aKarakostas, Foivos Georgios
000005564 773__ $$t AGU Fall Meeting 2021, New Orleans, online
000005564 8560_ $$fattilio.rivoldini@observatoire.be
000005564 906__ $$aInvited
000005564 980__ $$aCTALKCONT