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Check of free oscillation signal with SG data

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Chinese Science Bulletin

Abstract

The observation of the Earth’s free oscillation is an important way to study the Earth’s inner structure and geophysical parameters. Many geophysicists have investigated the Earth’s normal modes with strainmeters and spring gravimeters. Since the superconducting gravimeters appeared, people have gained a new kind of more stable instruments to detect the normal modes. The measurement for the Earth’s free oscillation with the superconducting gravimeters is one of the main goals of the Global Geodynamics Project. In this note, we have investigated the Earth’s normal modes excited by Peru Ms 7.9 Earthquake on June 23, 2001 with the superconducting gravimeter C032 at the Wuhan station. After having completed the subtraction of gravity tides with the 20th order polynomial fitting, and the correction for pressure and the analysis of the noise spectrum of the superconducting gravimeter, we accurately observed all base normal modes from 0 S 0 to 0 S 32 and the splittings of 0 S 2 and 0 S 3. Those results show a good agreement with the HB1 model.

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Authors and Affiliations

  1. Key Laboratory of Dynamic Geodesy, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, 430077, Wuhan, China

    Xiang’e Lei, Houze Xu & Heping Sun

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  1. Xiang’e Lei
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  2. Houze Xu
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  3. Heping Sun
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Lei, X., Xu, H. & Sun, H. Check of free oscillation signal with SG data. Chin.Sci.Bull. 47, 1573–1578 (2002). https://doi.org/10.1360/02tb9346

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  • DOI: https://doi.org/10.1360/02tb9346

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