Simulations of Seismic Wave Propagation on Mars
- Univ. of Nice Sophia Antipolis, Nice (France). CNRS-OCA-IRD-Geoazur
- Princeton Univ., NJ (United States)
- Federal Inst. of Technology (ETH), Zurich (Switzerland)
- Univ. of Oxford (United Kingdom)
- Univ. of Cote d'Azur, Nice (France). Lab. Lagrange. CNRS. Observatory of Cote d'Azur
- Royal Observatory of Belgium, Brussels (Belgium)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Paris Diderot Univ. (France). Inst. of Physics of the Globe of Paris-Sorbonne Paris City
- California Inst. of Technology (CalTech), Pasadena, CA (United States). Jet Propulsion Lab.
In this paper, we present global and regional synthetic seismograms computed for 1D and 3D Mars models based on the spectral-element method. For global simulations, we implemented a radially-symmetric Mars model with a 110 km thick crust. For this 1D model, we successfully benchmarked the 3D seismic wave propagation solver SPECFEM3D_GLOBE against the 2D axisymmetric wave propagation solver AxiSEM at periods down to 10 s. We also present higher-resolution body-wave simulations with AxiSEM down to 1 s in a model with a more complex 1D crust, revealing wave propagation effects that would have been difficult to interpret based on ray theory. For 3D global simulations based on SPECFEM3D_GLOBE, we superimposed 3D crustal thickness variations capturing the distinct crustal dichotomy between Mars’ northern and southern hemispheres, as well as topography, ellipticity, gravity, and rotation. The global simulations clearly indicate that the 3D crust speeds up body waves compared to the reference 1D model, whereas it significantly changes surface waveforms and their dispersive character depending on its thickness. We also perform regional simulations with the solver SES3D based on 3D crustal models derived from surface composition, thereby addressing the effects of various distinct crustal features down to 2 s. The regional simulations confirm the strong effects of crustal variations on waveforms. Finally, we conclude that the numerical tools are ready for examining more scenarios, including various other seismic models and sources.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE; Swiss National Science Foundation (Switzerland)
- Contributing Organization:
- Princeton Univ., NJ (United States); Univ. of Oxford (United Kingdom); Univ. of Cote d'Azur, Nice (France); Royal Observatory of Belgium, Brussels (Belgium); Paris Diderot Univ. (France); California Inst. of Technology (CalTech), Pasadena, CA (United States)
- Grant/Contract Number:
- AC52-06NA25396; 157133
- OSTI ID:
- 1369205
- Report Number(s):
- LA-UR-17-22631
- Journal Information:
- Space Science Reviews, Vol. 211, Issue 1-4; ISSN 0038-6308
- Publisher:
- SpringerCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Planned Products of the Mars Structure Service for the InSight Mission to Mars
|
journal | November 2016 |
From Initial Models of Seismicity, Structure and Noise to Synthetic Seismograms for Mars
|
journal | June 2017 |
The Marsquake Service: Securing Daily Analysis of SEIS Data and Building the Martian Seismicity Catalogue for InSight
|
journal | December 2018 |
SEIS: Insight’s Seismic Experiment for Internal Structure of Mars
|
journal | January 2019 |
SEIS: Insight’s Seismic Experiment for Internal Structure of Mars
|
text | January 2019 |
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