TY - JOUR
T1 - Temporal Variation and Frequency Dependence of Seismic Ambient Noise on Mars From Polarization Analysis
AU - Suemoto, Yudai
AU - Ikeda, Tatsunori
AU - Tsuji, Takeshi
N1 - Funding Information:
We acknowledge NASA, CNES, their partner agencies and Institutions (UKSA, SSO, DLR, JPL, IPGP‐CNRS, ETHZ, IC, and MPS‐MPG), and the flight operations team at JPL, SISMOC, MSDS, IRIS‐DMC, and PDS for providing SEED SEIS data. We used the seismometer data from IRIS‐DMC. This study was supported through JSPS KAKENHI Grant JP20H01997.
Funding Information:
We acknowledge NASA, CNES, their partner agencies and Institutions (UKSA, SSO, DLR, JPL, IPGP-CNRS, ETHZ, IC, and MPS-MPG), and the flight operations team at JPL, SISMOC, MSDS, IRIS-DMC, and PDS for providing SEED SEIS data. We used the seismometer data from IRIS-DMC. This study was supported through JSPS KAKENHI Grant JP20H01997.
Publisher Copyright:
© 2020. The Authors.
PY - 2020/7/16
Y1 - 2020/7/16
N2 - 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.
AB - 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.
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U2 - 10.1029/2020GL087123
DO - 10.1029/2020GL087123
M3 - Article
AN - SCOPUS:85088029394
VL - 47
JO - Geophysical Research Letters
JF - Geophysical Research Letters
SN - 0094-8276
IS - 13
M1 - e2020GL087123
ER -