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Spheroidal oscillations of the Earth stimulated by the Sumatra-Andaman earthquake with CDSN data

  • Published:
Acta Seismologica Sinica

Abstract

The 0S2∼0S54 spheroidal modes of Earth’s free oscillations, triggered by the great Sumatra-Andaman earthquake of 26 December 2004 are retrieved from VHZ data recorded by seven upgraded stations of China Digital Seismograph Network (CDSN). We compare these spheroidal modes with theoretical free oscillation spectra calculated from the Preliminary Reference Earth Model (PREM) and find a coincidence between their periods. Spectral splitting phenomenon is observed obviously in 0S2, 0S3, 0S4, 2S1 and 1S2 free oscillation modes. What is most noticeable is that the oscillation mode 2S1 is reported for the second time (the first time by Rosat et al) without any data stacking. We simulated the split singlet of 0S2 mode on seven CDSN stations based on general focal mechanism and seismic moment of the earthquake. The result shows that seismic moment of the earthquake can reach 1023 N·m. We also find that the recording of Earth’s free oscillations carries abundant information of source mechanism and earthquake location, which is applicable to the detailed study of source rupture parameters.

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Authors and Affiliations

  1. Institute of Geophysics, China Earthquake Administration, Beijing, 100081, China

    Wan Yong-ge  (万永革), Sheng Shu-zhong  (盛书中), Zhou Gong-wei  (周公威) & Guo Yan-ping  (郭燕平)

  2. Institute of Disaster Prevention Science and Technology, Sanhe, 065201, China

    Wan Yong-ge  (万永革) & Shang Dan  (尚丹)

Authors
  1. Wan Yong-ge  (万永革)
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  2. Sheng Shu-zhong  (盛书中)
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  3. Zhou Gong-wei  (周公威)
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  4. Guo Yan-ping  (郭燕平)
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  5. Shang Dan  (尚丹)
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Corresponding author

Correspondence to Wan Yong-ge  (万永革).

Additional information

Foundation item: State Key Fundamental Research Development Plan Project (2001CB711005) and National Natural Science Foundation of China (40374012)

Contribution No.07FE3010, Institute of Geophysics, China Earthquake Administration.

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Wan, Yg., Sheng, Sz., Zhou, Gw. et al. Spheroidal oscillations of the Earth stimulated by the Sumatra-Andaman earthquake with CDSN data. Acta Seimol. Sin. 20, 392–404 (2007). https://doi.org/10.1007/s11589-007-0392-5

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  • DOI: https://doi.org/10.1007/s11589-007-0392-5

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