High‐Frequency Seismic Events on Mars Observed by InSight

The seismometer deployed on the surface of Mars as part InSight mission (Interior Exploration using Seismic Investigations, Geodesy and Heat Transport) has recorded several hundreds marsquakes in first 478 sols after landing. majority these are classified high-frequency (HF) events frequency range from approximately 1 to 10 Hz Mars' surface. All HF excite a resonance around 2.4 show two distinct but broad arrivals seismic energy that separated by up 450 s. Based content vertical-to-horizontal ratio, event family been subdivided into three types, which we be identical only appear due signal-to-noise ratio. We here envelope shape is explained guided Pg Sg phases Martian crust simple layered models with scattering. Furthermore, relative travel times between can related epicentral distance, shows clustering. rate at observed varies an order magnitude over course one year cannot changes background noise only. absence additional constrain crustal attenuation layering, coda constrains diffusivity uppermost shallow layers Mars.