Different Martian Crustal Seismic Velocities Across the Dichotomy Boundary From Multi‐Orbiting Surface Waves - Archive ouverte HAL Access content directly
Journal Articles Geophysical Research Letters Year : 2023

Different Martian Crustal Seismic Velocities Across the Dichotomy Boundary From Multi‐Orbiting Surface Waves

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Jiaqi Li
Scott Mclennan
Mark Wieczorek
Mark Panning
W. Bruce Banerdt

Abstract

We have observed both minor-arc (R1) and major-arc (R2) Rayleigh waves for the largest marsquake (magnitude of 4.7 ± 0.2) ever recorded. Along the R1 path (in the lowlands), inversion results show that a simple, two-layer model with an interface located at 21–29 km and an upper crustal shear-wave velocity of 3.05–3.17 km/s can fit the group velocity measurements. Along the R2 path, observations can be explained by upper crustal thickness models constrained from gravity data and upper crustal shear-wave velocities of 2.61–3.27 and 3.28–3.52 km/s in the lowlands and highlands, respectively. The shear-wave velocity being faster in the highlands than in the lowlands indicates the possible existence of sedimentary rocks, and relatively higher porosity in the lowlands.
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Jiaqi Li, Caroline Beghein, Philippe Lognonné, Scott Mclennan, Mark Wieczorek, et al.. Different Martian Crustal Seismic Velocities Across the Dichotomy Boundary From Multi‐Orbiting Surface Waves. Geophysical Research Letters, 2023, 50 (1), ⟨10.1029/2022GL101243⟩. ⟨hal-03938829⟩
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