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Detection, Analysis, and Removal of Glitches From InSight's Seismic Data From Mars

Scholz, John‐Robert and Widmer‐Schnidrig, Rudolf and Davis, Paul and Lognonné, Philippe and Pinot, Baptiste and Garcia, Raphaël F. and Hurst, Kenneth and Pou, Laurent and Nimmo, Francis and Barkaoui, Salma and Raucourt, Sébastien de and Knapmeyer‐Endrun, Brigitte and Knapmeyer, Martin and Orhand‐Mainsant, Guénolé and Compaire, Nicolas and Cuvier, Arthur and Beucler, Éric and Bonnin, Mickaël and Joshi, Rakshit and Sainton, Grégory and Stutzmann, Eléonore and Schimmel, Martin and Horleston, Anna and Böse, Maren and Ceylan, Savas and Clinton, John and van Driel, Martin and Kawamura, Taichi and Khan, Amir and Stähler, Simon C. and Giardini, Domenico and Charalambous, Constantinos and Stott, Alexander E. and Pike, William T. and Christensen, Ulrich R. and Banerdt, William Bruce Detection, Analysis, and Removal of Glitches From InSight's Seismic Data From Mars. (2020) Earth and Space Science, 7 (11). ISSN 2333-5084

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Official URL: https://doi.org/10.1029/2020EA001317

Abstract

The instrument package SEIS (Seismic Experiment for Internal Structure) with the three very broadband and three short‐period seismic sensors is installed on the surface on Mars as part of NASA's InSight Discovery mission. When compared to terrestrial installations, SEIS is deployed in a very harsh wind and temperature environment that leads to inevitable degradation of the quality of the recorded data. One ubiquitous artifact in the raw data is an abundance of transient one‐sided pulses often accompanied by high‐frequency spikes. These pulses, which we term “glitches”, can be modeled as the response of the instrument to a step in acceleration, while the spikes can be modeled as the response to a simultaneous step in displacement. We attribute the glitches primarily to SEIS‐internal stress relaxations caused by the large temperature variations to which the instrument is exposed during a Martian day. Only a small fraction of glitches correspond to a motion of the SEIS package as a whole caused by minuscule tilts of either the instrument or the ground. In this study, we focus on the analysis of the glitch+spike phenomenon and present how these signals can be automatically detected and removed from SEIS's raw data. As glitches affect many standard seismological analysis methods such as receiver functions, spectral decomposition and source inversions, we anticipate that studies of the Martian seismicity as well as studies of Mars' internal structure should benefit from deglitched seismic data.

Item Type:Article
Audience (journal):International peer-reviewed journal
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Institution:Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
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Deposited On:11 Jan 2022 12:36

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