Sea level variation in seismic normal mode band observed with on-ice GPS and on-land SG at Syowa Station, Antarctica

Details Sea level variation in seismic normal mode band observed with on-ice GPS and on-land SG at Syowa Station, Antarctica Sea level variation in seismic normal mode band observed with on-ice GPS and on-land SG at Syowa Station, Antarctica

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30g..55n&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 7, pp. 55-1, CiteID 1402, DOI 10.1029/2003GL016919

Physics

Geodesy And Gravity: Ocean/Earth/Atmosphere Interactions (3339), Geodesy And Gravity: Instruments And Techniques, Oceanography: General: Arctic And Antarctic Oceanography, Seismology: Surface Waves And Free Oscillations

Scientific paper

We analyze sea level variation data acquired by a differential GPS and gravity data acquired by a superconducting gravimeter (SG) at Syowa Station, Antarctica, in an eight month period of 1998. At frequencies between 0.2 and 2.5 mHz in the seismic normal mode band we observe similar spectral peaks in both of the data sets. We also observe high coherence and zero phase between the two data sets at the frequencies of these peaks. The results of response analysis and simple mode calculation suggest that the observed peaks in the SG data are due to the effects of ocean water attraction and loading associated with sea level variation, a possible cause of which is the seiche in Lützow-Holm Bay around the station. Applying a transfer function method to both of the data sets, we can reduce the background noise due to the oceanic effects in the SG data.

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