EGU21-14998
https://doi.org/10.5194/egusphere-egu21-14998
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Estimation of the marsquakes’ location and the interior structure of Mars using InSight data

Melanie Drilleau1, Raphaël Garcia1, Henri Samuel2, Attilio Rivoldini3, Mark Wieczorek4, Philippe Lognonné2, Mark Panning5, Clément Perrin6, Savas Ceylan7, Nick Schmerr8, Amir Khan7, Vedran Lekic8, Simon Stähler7, Domenico Giardini7, Doyeon Kim8, Quancheng Huang8, John Clinton7, Taïchi Kawamura2, John-Robert Scholz9, Paul Davis10, and the InSight Science Team*
Melanie Drilleau et al.
  • 1ISAE-SUPAERO, 10 Avenue Edouard Belin, 31400 Toulouse, France (melanie.drilleau@isae-supaero.fr)
  • 2Institut de Physique du Globe de Paris, CNRS, Université de Paris, 1 rue Jussieu, 75005 Paris, France
  • 3Royal Observatory of Belgium, Brussels, Belgium
  • 4Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange, Université Côte d’Azur, Nice, France
  • 5Jet propulsion Laboratory, Pasadena, CA, USA
  • 6Laboratoire de Planétologie et Géodynamique, UMR CNRS 6112, Nantes, France
  • 7Institute of Geophysics, ETH Zurich, Sonneggstrasse 5, Zurich, Switzerland
  • 8Department of Geology, University of Maryland, College Park, Maryland, USA
  • 9Max Planck Institute for Solar System Research, Göttingen, Germany
  • 10Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, Los Angeles, CA, USA
  • *A full list of authors appears at the end of the abstract

The InSight (Interior Exploration using Seismic Investigations, Geodesy and Heat Transport) lander successfully delivered a geophysical instrument package to the Martian surface on November 26, 2018, including a broadband seismometer called SEIS (Seismic Experiment for Interior Structure). After two years of recording, seismic body waves phases of a small number of high-quality marsquakes have been clearly identified. In this work, we will present how we estimate the body waves arrival times, and how we handle them to constrain the locations of the marsquakes and the interior structure. The inverse problem relies on a Bayesian approach, to investigate a large range of possible locations and interior models. Due to the small number of data, the advantage of using such a method is to provide a quantitative measure of the uncertainties and the non-uniqueness. In order to take into account the strong variations of the crustal thickness due to the crustal dichotomy, and thus consider the seismic lateral variations, which could cause significant misinterpretations, arrival times corrections are added using crustal thickness maps obtained from gravity and topography data.

 

InSight Science Team:

Baptiste Pinot, Bruce Banerdt

How to cite: Drilleau, M., Garcia, R., Samuel, H., Rivoldini, A., Wieczorek, M., Lognonné, P., Panning, M., Perrin, C., Ceylan, S., Schmerr, N., Khan, A., Lekic, V., Stähler, S., Giardini, D., Kim, D., Huang, Q., Clinton, J., Kawamura, T., Scholz, J.-R., and Davis, P. and the InSight Science Team: Estimation of the marsquakes’ location and the interior structure of Mars using InSight data, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-14998, https://doi.org/10.5194/egusphere-egu21-14998, 2021.

Display materials

Display file

Comments on the display material

to access the discussion