TY  - JOUR
A1  - Scholz, John‐Robert
A1  - Widmer‐Schnidrig, Rudolf
A1  - Davis, Paul
A1  - Lognonné, Philippe
A1  - Pinot, Baptiste
A1  - Garcia, Raphaël F.
A1  - Hurst, Kenneth
A1  - Pou, Laurent
A1  - Nimmo, Francis
A1  - Barkaoui, Salma
A1  - de Raucourt, Sébastien
A1  - Knapmeyer‐Endrun, Brigitte
A1  - Knapmeyer, Martin
A1  - Orhand‐Mainsant, Guénolé
A1  - Compaire, Nicolas
A1  - Cuvier, Arthur
A1  - Beucler, Éric
A1  - Bonnin, Mickaël
A1  - Joshi, Rakshit
A1  - Sainton, Grégory
A1  - Stutzmann, Eléonore
A1  - Schimmel, Martin
A1  - Horleston, Anna
A1  - Böse, Maren
A1  - Ceylan, Savas
A1  - Clinton, John
A1  - van Driel, Martin
A1  - Kawamura, Taichi
A1  - Khan, Amir
A1  - Stähler, Simon C.
A1  - Giardini, Domenico
A1  - Charalambous, Constantinos
A1  - Stott, Alexander E.
A1  - Pike, William T.
A1  - Christensen, Ulrich R.
A1  - Banerdt, W. Bruce
T1  - Detection, Analysis, and Removal of Glitches From InSight's Seismic Data From Mars
Y1  - 2020-10-30
VL  - 7
IS  - 11
JF  - Earth and Space Science
DO  - 10.1029/2020EA001317
DO  - 10.23689/fidgeo-4144
N2  - 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.
N2  - Plain Language Summary: The instrument package SEIS (Seismic Experiment for Internal Structure) with two fully equipped seismometers is installed on the surface of Mars as part of NASA's InSight Discovery mission. When compared to terrestrial installations, SEIS is more exposed to wind and daily temperature changes that leads to inevitable degradation of the quality of the recorded data. One consequence is the occurrence of a specific type of transient noise that we term “glitch”. Glitches show up in the recorded data as one‐sided pulses and have strong implications for the typical seismic data analysis. Glitches can be understood as step‐like changes in the acceleration sensed by the seismometers. We attribute them 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 whole SEIS instrument. In this study, we focus on the detection and removal of glitches and anticipate that studies of the Martian seismicity as well as studies of Mars's internal structure should benefit from deglitched seismic data.
N2  - Key Points: Glitches due to steps in acceleration significantly complicate seismic records on Mars. Glitches are mostly due to relaxations of thermal stresses and instrument tilt. We provide a toolbox to automatically detect and remove glitches.
UR  - http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/8484
ER  -