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Spheroidal oscillations of the Earth stimulated by the Sumatra-Andaman earthquake with CDSN data
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作者 万永革 盛书中 +2 位作者 周公威 郭燕平 尚丹 《Acta Seismologica Sinica(English Edition)》 CSCD 2007年第4期392-404,共13页
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 Seism... 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 10^23 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. 展开更多
关键词 China Digital Seismograph Network (CDSN) Sumatra-Andaman earthquake Earth's free os-cillation spheroidal oscillation
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Spheroidal Oscillations in the Earth Excited by the Wenchuan Earthquake
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作者 Ren Jia Chen Huajing +3 位作者 Wang Song Jiang Cuirong Yang Yaowen Wang Changjiang 《Earthquake Research in China》 2009年第4期488-496,共9页
Based on the digital observational data from pendulum tilt-meters and water tube tilt-meters, the spheroidal free oscillations of the Earth, excited by the M_S8.0 Wenchuan earthquake of May 12, 2008, were obtained usi... Based on the digital observational data from pendulum tilt-meters and water tube tilt-meters, the spheroidal free oscillations of the Earth, excited by the M_S8.0 Wenchuan earthquake of May 12, 2008, were obtained using the method of power spectral density estimation without any calculation to erase solid tides. The result matches well with the PREM results. Compared to the theoretical free oscillation from the PREM model, all relative errors are concentrated on 0.1% except for _0S_7, whose relative error is greater than 0.3%. This research provides a new method to determine the spheroidal modes of Earth's free oscillations from observations of the pendulum tilt-meter and water tube tilt-meter, which may be useful in the future study of the Earth's free oscillations. 展开更多
关键词 Pendulum tilt-meter Water tube tilt-meter Free oscillations of the Earth spheroidal oscillations
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THE PARAMETER KERNELS FOR THE LINEAR INVERSION OF THE FREE OSCILLATION OF THE EARTH (Ⅰ) 被引量:1
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作者 方俊 《Science China Chemistry》 SCIE EI CAS 1991年第1期78-85,共8页
This is the second instalment of the paper, in which the method of derivation of the for-mulas of parameter kernels for the spheroidal oscillations are considered. The principle ofRayleigh is used to derive the formul... This is the second instalment of the paper, in which the method of derivation of the for-mulas of parameter kernels for the spheroidal oscillations are considered. The principle ofRayleigh is used to derive the formulas of the kernels of the two elastic parameters, i.e. μand λ. But for that of ρ, it is found very difficult to get satisfactory results. A new butsimpler approach is followed and very satisfactory results are obtained. 展开更多
关键词 spheroidal oscillations
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