000007861 001__ 7861
000007861 005__ 20260127181119.0
000007861 037__ $$aPOSTER-2026-0032
000007861 100__ $$aDrilleau, Melanie
000007861 245__ $$aInferring Mars’ Internal Structure from a Probabilistic Inversion of Complementary Geophysical Data
000007861 260__ $$c2025
000007861 269__ $$c2025-12-16
000007861 520__ $$aUnderstanding the deep interior of Mars is key to reconstructing its geological evolution, thermal history, and present-day dynamics. NASA's InSight mission has yielded a valuable seismic dataset, enabling constraints on crustal, mantle, and core properties. However, strong trade-offs between temperature and composition in seismic interpretations limit the resolution of interior models. To overcome this challenge, we incorporate electromagnetic induction data from Mars Global Surveyor as an additional and independent constraint. We present a joint probabilistic inversion framework that simultaneously fits body-wave arrival times, electrical conductivity, the tidal Love number k2 , and the planet’s moment of inertia. A central aspect of our method is the integration of Mars’ long-term thermal evolution into the forward modeling, together with mineral physics and petrological constraints, allowing us to directly constrain key geodynamical parameters. We investigate three mantle compositions with variable Mg content [1, 2, 3], and compare homogeneous models to those that include a molten basal layer in the lower mantle [4]. For homogeneous mantle models, two families of solutions are found for each mantle composition: one with low Mg content and high potential temperature, which better reproduces electrical conductivity profiles due to a thicker lithosphere, and another with higher Mg content and lower temperatures. In contrast, models with a basal molten layer generally yield thinner lithospheres and fit the conductivity data less accurately. Furthermore, the mantle composition of [3] appears less consistent with the combined dataset. Our results highlight the value of electromagnetic data in resolving the Martian interior, and suggest that future efforts should aim to improve both the quality of induction measurements and the seismic constraints on mantle phase transitions.
000007861 536__ $$a3PRODPLANINT/$$c3PRODPLANINT/$$f3PRODPLANINT
000007861 594__ $$aNO
000007861 700__ $$aSamuel, Henri
000007861 700__ $$aVerhoeven, Olivier
000007861 700__ $$aRivoldini, Attilio
000007861 700__ $$aCollinet, Max
000007861 700__ $$aGarcia, Raphael F.
000007861 700__ $$aLognonné, Philippe Henri
000007861 773__ $$tAGU 2025 Fall meeting, New Orleans, USA
000007861 8560_ $$fattilio.rivoldini@ksb-orb.be
000007861 85642 $$ahttps://agu.confex.com/agu/agu25/meetingapp.cgi/Paper/1867332
000007861 8564_ $$s10596699$$uhttps://publi2-as.oma.be/record/7861/files/POSTER_AGU_2025.pdf
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000007861 980__ $$aCPOSTER