地震学报（英文版）2007，Vol.20Issue(4)：392-404,13.
Spheroidal oscillations of the Earth stimulated by the Sumatra-Andaman earthquake with CDSN data
Spheroidal oscillations of the Earth stimulated by the Sumatra-Andaman earthquake with CDSN data
摘要
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.关键词
China Digital Seismograph Network (CDSN)/ Sumatra-Andaman earthquake/ Earth's free oscillation/ spheroidal oscillationKey words
China Digital Seismograph Network (CDSN)/ Sumatra-Andaman earthquake/ Earth's free oscillation/ spheroidal oscillation分类
天文与地球科学引用本文复制引用
WAN Yong-ge,SHENG Shu-zhong,ZHOU Gong-wei,GUO Yan-ping,SHANG Dan..Spheroidal oscillations of the Earth stimulated by the Sumatra-Andaman earthquake with CDSN data[J].地震学报（英文版）,2007,20(4):392-404,13.基金项目
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. （2001CB711005）
