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Simulation of the Planetary Interior Differentiation Processes in the Laboratory
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Improving Constraints on Planetary Interiors With PPs Receiver Functions.

D Kim1,2, V Lekić1, J C E Irving3

  • 1Department of Geology University of Maryland College Park College Park MD USA.

Journal of Geophysical Research. Planets
|November 26, 2021
PubMed
Summary
This summary is machine-generated.

Receiver function analysis using P-wave multiples (PPs-RFs) enhances understanding of Martian crustal structure, especially with limited data. This method reveals a three-layer Martian crust, crucial for planetary exploration.

Keywords:
InSightMarsMartian crustReceiver functionSeismologyTransdimensional hierarchical Bayesian

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Area of Science:

  • Seismology and Planetary Science
  • Geophysics and Interior Structure

Background:

  • Receiver function (RF) analysis is key to understanding crust and mantle structure.
  • P-wave free-surface multiples (PP) and their conversions offer new avenues for RF analysis.
  • Planetary missions often face data limitations, necessitating advanced analytical techniques.

Purpose of the Study:

  • To explore the utility of P-wave multiples (PPs-RFs) in receiver function analysis.
  • To compute robust P-to-S (Ps)- and PPs-RFs using InSight marsquake data.
  • To determine Martian crustal structure, particularly under data-constrained conditions.

Main Methods:

  • Utilized earthquake records to analyze P-wave multiples and their conversions.
  • Employed a transdimensional hierarchical Bayesian deconvolution approach.
  • Computed Ps-RFs and PPs-RFs from InSight mission recordings of five marsquakes.

Main Results:

  • Ps-RF results confirmed previously reported Ps converted phases with enhanced coherence.
  • PPs-RFs did not show the 7.2 s lag time arrival observed in Ps-RFs.
  • Synthetic modeling indicated that the absence of the 7.2 s phase necessitates a three-layer Martian crust, sensitive to intra-crustal layer properties.

Conclusions:

  • A three-layer crustal model is supported by Ps-RFs, PPs-RFs, and Sp-RFs.
  • The PPs-RF analysis uniquely constrains the Martian crust to three layers, resolving ambiguity present in Ps-RFs alone.
  • PPs-RFs provide complementary data, maximizing information extraction in data-limited planetary exploration scenarios.