Temporal Variation and Frequency Dependence of Seismic Ambient Noise on Mars From Polarization Analysis

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

We applied a polarization analysis of InSight seismic data to estimate the temporal variation and frequency dependence of the Martian ambient noise field. Low-frequency (<1 Hz) P waves show a diurnal variation in their dominant back azimuths that are apparently related to wind and the direction of sunlight in a distant area. Low-frequency Rayleigh waves (0.25–1 Hz) show diurnal variations and a dominant back azimuth related to the wind direction in a nearby area. Low-frequency signals that are derived mainly from wind may be sensitive to subsurface structure deeper than the lithological boundary derived from an autocorrelation analysis. On the other hand, dominant back azimuths of high-frequency (>1 Hz) waves point toward the InSight lander, especially in daytime, indicating that wind-induced lander noise is dominant at high frequencies. These results point to the presence of several ambient noise sources as well as geologic structure at the landing site.

Original languageEnglish
Article numbere2020GL087123
JournalGeophysical Research Letters
Volume47
Issue number13
DOIs
Publication statusPublished - Jul 16 2020

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

Fingerprint Dive into the research topics of 'Temporal Variation and Frequency Dependence of Seismic Ambient Noise on Mars From Polarization Analysis'. Together they form a unique fingerprint.

Cite this