Constraints on the Crustal Structure of Mars From P- and S-receiver Functions and Ambient Vibrations Autocorrelations
The crustal structure of terrestrial planets holds important clues on how these bodies formed and differentiated, as well as on their thermal and magmatic evolution over billions of years. For Mars, the uncertainty on the average crustal thickness was larger than 50% in the absence of direct seismic measurements and no information on crustal layering was available. We aim to close this gap in knowledge using data from the broad-band seismometer on NASA’s InSight (Interior Exploration using Seismic Investigations, Geodesy and Heat Transport) mission. With the mission well into its third year, we calculate P- and S-wave receiver functions for 12 and 10 marsquakes, respectively, as well as vertical component ambient vibration autocorrelations. These data sets are complementary, in that receiver functions extract converted phases from teleseismic events, whereas the autocorrelations provide information on P-wave reverberations. We expand the initial marsquake dataset [1] by a factor of 3 to 4, which allows drawing more robust conclusions, e.g. by consistently identifying two conversions in S-receiver functions and by including PPs-receiver functions of a recent distant marsquake for a larger spread in move-out.
The constraints that result from amplitude stacking of direct phase arrivals and multiples, using both receiver function data sets and the autocorrelations, for layer thicknesses and P- and S-wave velocities beneath the InSight landing site in Elysium Planitia are currently under investigation. Using orbital constraints from gravity and topography, the crustal thickness measurement at the InSight landing site can be extrapolated to map the Moho depth across the whole planet. We discuss implications in terms of global crustal thickness, crustal composition and porosity, distribution of heat producing elements and present day heat flux.
[1] Knapmeyer-Endrun et al., Science, 2021, doi:10.1126/science.abf8966
Session: Extraterrestrial Seismology: Seismology from Mars, the Moon and Everywhere
Type: Oral
Room: Regency A-C
Date: 4/21/2022
Presentation Time: 05:30 PM Pacific
Presenting Author: Brigitte Knapmeyer-Endrun
Student Presenter: No
Additional Authors
Brigitte Knapmeyer-Endrun Presenting Author Corresponding Author brigitte.knapmeyer-endrun@uni-koeln.de Bensberg Observatory, University of Cologne |
Mark Panning mark.p.panning@jpl.nasa.gov Jet Propulsion Laboratory, Caltech |
Rakshit Joshi joshir@mps.mpg.de Max Planck Institute for Solar System Research |
Felix Bissig felix.bissig@erdw.ethz.ch ETH Zurich |
Amir Khan akhan@ethz.ch ETH Zurich, University of Zurich |
Doyeon Kim dk696@umd.edu University of Maryland |
Vedran Lekic ved@umd.edu University of Maryland |
Paul Davis pdavisucla@gmail.com University of California, Los Angeles |
Benoit Tauzin benoit.tauzin@univ-lyon1.fr Université de Lyon |
Matthieu Plasman plasman@ipgp.fr Institut de Physique du Globe de Paris, Paris, , France |
Martin Schimmel mschimmel@geo3bcn.csic.es GEO3BCN-CSIC, Barcelona, , Spain |
Eléonore Stutzman stutz@ipgp.fr Institut de Physique du Globe de Paris, Paris, , France |
Nicolas Compaire nicolas.compaire@isae-supaero.fr ISAE-SUPAERO, Toulouse, , France |
Raphael F Garcia raphael.garcia@isae-supaero.fr ISAE-SUPAERO, Toulouse, , France |
Ludovic Margerin ludovic.margerin@irap.omp.eu IRAP, Toulouse, , France |
Nicholas C Schmerr nschmerr@umd.edu University of Maryland, College Park, Maryland, United States |
Ana-Catalina Plesa ana.plesa@dlr.de DLR, Berlin, , Germany |
Mark A Wieczorek mark.wieczorek@oca.eu OCA, Université Côte d'Azur, Nice, , France |
Ebru Bozdag bozdag@mines.edu Colorado School of Mines, Boulder, Colorado, United States |
Quancheng Huang qchuang@mines.edu Colorado School of Mines, Boulder, Colorado, United States |
Scott M McLennan scott.mclennan@stonybrook.edu Stony Brook University, Stony Brook, New York, United States |
Henri Samuel samuel@ipgp.fr Institut de Physique du Globe de Paris, Paris, , France |
Chloe Michaut chloe.michaut@ens-lyon.fr Ecole Normale Supérieure de Lyon, Lyon, , France |
Suzanne E Smrekar ssmrekar@jpl.nasa.gov Jet Propulsion Laboratory, Caltech, Pasadena, California, United States |
Attilio Rivoldini attilio.rivoldini@oma.be Royal Observatory of Belgium, Brussels, , Belgium |
Baptiste Pinot baptiste.pinot@isae-supaero.fr ISAE-SUPAERO, Toulouse, , France |
John-Robert Scholz scholz@mps.mpg.de Max Planck Institute of Solar System Research, Göttingen, , Germany |
Philippe Lognonne lognonne@ipgp.fr Institut de Physique du Globe de Paris, Paris, , France |
Domenico Giardini domenico.giardini@erdw.ethz.ch ETH Zurich, Zurich, , Switzerland |
William B Banerdt bruce.banerdt@jpl.nasa.gov Jet Propulsion Laboratory, Caltech, Pasadena, California, United States |
Constraints on the Crustal Structure of Mars From P- and S-receiver Functions and Ambient Vibrations Autocorrelations
Category
Extraterrestrial Seismology: Seismology from Mars, the Moon and Everywhere
Description