@article{d17566a64dfb4a26abb63179a6cff682,
title = "Structure Along the Martian Dichotomy Constrained by Rayleigh and Love Waves and Their Overtones",
abstract = "Using seismic recordings of event S1222a, we measure dispersion curves of Rayleigh and Love waves, including their first overtones, and invert these for shear velocity (VS) and radial anisotropic structure of the Martian crust. The crustal structure along the topographic dichotomy is characterized by a fairly uniform vertically polarized shear velocity (VSV) of 3.17 km/s between ∼5 and 30 km depth, compatible with the previous study by Kim et al. (2022), https://doi.org/10.1126/science.abq7157. Radial anisotropy as large as 12% (VSH > VSV) is required in the crust between 5 and 40 km depth. At greater depths, we observe a large discontinuity near 63 ± 10 km, below which VSV reaches 4.1 km/s. We interpret this velocity increase as the crust-mantle boundary along the path. Combined gravimetric modeling suggests that the observed average crustal thickness favors the absence of large-scale density differences across the topographic dichotomy.",
keywords = "InSight, Mars, Martian crust, Martian dichotomy, surface waves",
author = "D. Kim and St{\"a}hler, {S. C.} and S. Ceylan and V. Lekic and R. Maguire and G. Zenh{\"a}usern and J. Clinton and D. Giardini and A. Khan and Panning, {M. P.} and P. Davis and M. Wieczorek and N. Schmerr and P. Lognonn{\'e} and Banerdt, {W. B.}",
note = "This paper is InSight contribution number 283. The authors acknowledge the NASA, the CNES, their partner agencies and Institutions (UKSA, SSO, DLR, JPL, IPGP‐CNRS, ETHZ, IC, and MPS‐MPG) and the flight operations team at JPL, SISMOC, MSDS, IRIS‐DMC, and PDS for providing the SEED SEIS data. Marsquake Service (MQS) operations at ETH are supported by ETH Research Grant ETH‐06 17‐02. ETH authors recognize support from the ETH+ funding scheme (ETH+02 19‐1: “Planet Mars”). V.L. and N.S. acknowledge funding from NASA Grant 80NSSC18K1628 and NASA Solar System Exploration Research Virtual Institute (SSERVI) Cooperative Agreement 80NSSC19M0216. We acknowledge the thorough and thoughtful reviews from two anonymous reviewers that greatly improved the manuscript. This paper is InSight contribution number 283. The authors acknowledge the NASA, the CNES, their partner agencies and Institutions (UKSA, SSO, DLR, JPL, IPGP-CNRS, ETHZ, IC, and MPS-MPG) and the flight operations team at JPL, SISMOC, MSDS, IRIS-DMC, and PDS for providing the SEED SEIS data. Marsquake Service (MQS) operations at ETH are supported by ETH Research Grant ETH-06 17-02. ETH authors recognize support from the ETH+ funding scheme (ETH+02 19-1: “Planet Mars”). V.L. and N.S. acknowledge funding from NASA Grant 80NSSC18K1628 and NASA Solar System Exploration Research Virtual Institute (SSERVI) Cooperative Agreement 80NSSC19M0216. We acknowledge the thorough and thoughtful reviews from two anonymous reviewers that greatly improved the manuscript.",
year = "2023",
month = apr,
day = "28",
doi = "10.1029/2022GL101666",
language = "English (US)",
volume = "50",
journal = "Geophysical Research Letters",
issn = "0094-8276",
publisher = "John Wiley & Sons, Ltd.",
number = "8",
}