4.7 Article

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

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GEOPHYSICAL RESEARCH LETTERS
卷 50, 期 1, 页码 -

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AMER GEOPHYSICAL UNION
DOI: 10.1029/2022GL101243

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surface wave; marsquake; Rayleigh wave; porosity; Mars; dichotomy

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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), 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.
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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