Statistical Analysis of the Perturbations in the Martian Seismic Signal from the InSight Mission

SEIS (Seismic Experiment for Interior Structure) is the main instrument of the NASA InSight mission, which landed on the martian ground on November, 26 2018. Due to a basic deployement and the hostile martian environnement,the seismic signal is altered by many perturbations caused in particular by the harsh winds and/or large variations of temperature. The hundreds of daily disruptions in the seismic signal therefore make its analysis difficult. We present here a catalog of all long period disturbances detected in the three components, based on the comparison between the seismic signal and a normal law. This method allows to detect any non-Gaussian perturbation in the seismic signal. We show a comparison of our glitch catalog with those based on other detection methods and propose some statistical analyses. This database paves the way for a future automatic glitch recognition using clustering methods. When comparing pressure drop detections using both SEIS and APSS pressure sensor, we propose a proxy to infer atmospheric variations even when the pressure sensor is turned off as for several months. Finally, as for any terrestrial seismic station, our detection method can be used to estimate the quality of any deployment or misbehavior of the sensor.