H/V Analyses of High-frequency InSight Seismic Ambient Noise and Subsurface Structure Detection

Understanding the characteristics of seismic observation environment of InSight mission is vital to make good use of the InSight seismic data. Here I report a series of time-frequency analyses of InSight ambient noise data in high frequencies (1-30 Hz), including the horizontal to vertical (H/V), polarization, damping and coherency characteristics, and the comparison between onboard SP, ground SP and ground VBB data. Afterwards, I conducted numerical modeling of HVSR and analyzed the correlations between H/V variation and local meteorological conditions, which confirmed that the wind-induced lander vibrations are the major sources of the InSight seismic ground motions in high frequencies. Finally, I present the subsurface structure inversion results based on the H/V and coherency analyses of S1222a event.