The Site Tilt and Lander Transfer Function from the Short-Period Seismometer of InSight on Mars

ABSTRACT The National Aeronautics and Space Administration InSight mission has deployed the seismic experiment, SEIS, on surface of Mars, recorded a variety signals including marsquakes dust devils. This work presents results tilt local noise sources, which provide context to aid interpretation observed allow an examination near-surface properties. Our analysis uses data by short-period sensors deck, throughout deployment in final configuration. We use thermal decorrelation estimate sol-to-sol tilt. is examined across over Martian year. After each modification site, seen stabilize 3–20 sols depending action, total change <0.035°. Long-term year limited <0.007°. also investigate attenuation lander-induced vibrations between lander SEIS. Robotic arm motions known source 5–9 Hz bandwidth, yielding amplitude 100 1000 times. wind sensitivity from deck ground similar value 1.5–9 range, thus favoring dominated induced wind. Wind sensitivities outside this bandwidth exhibit different changes, indicating coupling. are interpreted through finite-element regolith with depth-dependent Young’s modulus. argue that discrepancies model observations due compaction beneath legs and/or anelasticity. An for effective modulus obtained as 62–81 MPa, corroborating previous estimates top layer duricrust.