10:50 AM - 11:05 AM
[U03-01] Changes in surface-wave phase velocities below the Greenland Ice Sheet measured from three-component ambient noise correlation method
Keywords:Greenland Ice Sheet (GrIS), Seismic interferometry, Changes in surface-wave phase velocity, Three-component seismograms
In this study, we extend our previous work for 5-year and three-component continuous seismograms from stations on GrIS, to yield none cross-correlograms (ZZ, ZR, ZT, RZ, RR, RT, TZ, TR, and TT, where Z, R, and T stand for the vertical, radial, and transverse components, respectively) between station pairs. Through these analyses, we have succeeded in retrieving Rayleigh waveforms (ZZ, ZR, RR, and RZ), Love waveforms (TT), and the coupling between Rayleigh and Love waves (ZT, RT, TZ, and TR). We find clear seasonal/long-term changes in both Rayleigh- and Love-wave phase velocities, whose characteristics are similar to those in our previous work using only ZZ copmponent. In this presentation, we mainly introduce the results for Love waves, which might be much sensitive to meltwater below the GrIS.
Toyokuni, G., H. Takenaka, R. Takagi, M. Kanao, S. Tsuboi, Y. Tono, D. Childs, D. Zhao (2018) Changes in Greenland ice bed conditions inferred from seismology. Phys. Earth Planet. In. 277, 81-98. https://doi.org/10.1016/j.pepi.2017.10.010.