Measuring Fundamental and Higher Mode Surface Wave Dispersion on Mars From Seismic Waveforms

One of the goals Interior Exploration using Seismic Investigations, Geodesy and Heat Transport (InSight) mission is to constrain interior structure Mars. We present a hierarchical transdimensional Bayesian approach extract phase velocity dispersion shear-wave (VS) models from single seismogram. This method was adapted Mars technique recently developed for Earth (Xu & Beghein, 2019, https://doi.org/10.1093/gji/ggz133). Monte Carlo Markov Chains seek an ensemble one dimensional (1-D) VS between source receiver that can explain observed waveform. The obtained are used calculate velocities fundamental higher modes at selected periods, subsequent analysis performed assess which were reliably measured. An advantage our it also fit unknown data noise, reduces risk overfitting data. In addition, uncertainties in parameters be propagated, yielding more accurate model parameter uncertainties. this study, we first discuss challenges stemming station characterize both absence reference model. then demonstrate feasibility Structure Service blind test own synthetic data, included realistic noise levels based on recorded by InSight.