| Spheroidal oscillations of the Earth stimulated by the Sumatra-Andaman earthquake with CDSN data |
| |
| 作者姓名： | 万永革 盛书中 周公威 郭燕平 尚丹 |
| |
| 作者单位： | Institute of Geophysics China Earthquake Administration，Institute of Geophysics，China Earthquake Administration，Institute of Geophysics，China Earthquake Administration，Institute of Geophysics，China Earthquake Administration，Institute of Disaster Prevention Science and Technology，Beijing 100081，China，Institute of Disaster Prevention Science and Technology，Sanhe 065201，China，Beijing 100081，China，Beijing 100081，China，Beijing 100081，China，Sanhe 065201，China |
| |
| 基金项目： | State Key Fundamental Research Development Plan Project (2001CB711005)，National Natural Science Founda-tion of China (40374012) |
| |
| 摘 要： | 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.
|
| 关 键 词： | China Digital Seismograph Network (CDSN) Sumatra-Andaman earthquake Earth’s free oscillation spheroidal oscillation |
| 文章编号： | 1000-9116（2007）04-0392-13 |
| 收稿时间： | 27 October 2006 |
| 修稿时间： | 2006-10-27 |
Spheroidal oscillations of the Earth stimulated by the Sumatra-Andaman earthquake with CDSN data |
| |
| Wan Yong-ge , Sheng Shu-zhong , Zhou Gong-wei , Guo Yan-ping and Shang Dan.Spheroidal oscillations of the Earth stimulated by the Sumatra-Andaman earthquake with CDSN data[J].Acta Seismologica Sinica(English Edition),2007,20(4):392-404. |
| |
| Authors: | Wan Yong-ge Sheng Shu-zhong Zhou Gong-wei Guo Yan-ping and Shang Dan |
| |
| 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.
Contribution No.07FE3010, Institute of Geophysics, China Earthquake Administration. |
| |
| Keywords: | China Digital Seismograph Network (CDSN) Sumatra-Andaman earthquake Earth’ s free oscillation spheroidal oscillation |
| 本文献已被 CNKI 维普 SpringerLink 等数据库收录！ |
