摘要
分析了中国数字地震台网(CDSN)改造后的佘山台(SSE)甚长周期地震仪(STS-1,瑞士生产)观测到的大地震后3天的VHZ波形资料,利用功率谱密度估计方法,在没有对资料进行去固体潮处理的情况下,准确获得了2004年12月26日印度洋地震激发的基频球型振荡,并与地球初步参考模型(PREM)的理论自由振荡周期进行了对比,发现实测振荡周期与PREM预测的振荡周期其本符合。其细微差异可以用来研究和解释地球介质的横向不均匀性和各向异性等现象。
We had analyzed the VHZ earthquake waveform data recorded for 3 days by SSE station of China Digital Seismograph Network（CDSN） occurred on Dec. 26th 2004 in the Indonesia and extracted Spheroidal mode of the earth free oscillation using power spectral density （PSD） estimation without removing the solid tide in our process. Comparing with the frequency of modes of preliminary reference earth model （PREM）, our results are very approaching it. The tiny difference between them can be used to study and explain lateral heterogeneous or anisotropic media of the earth.
出处
《地震地磁观测与研究》
2005年第4期13-17,共5页
Seismological and Geomagnetic Observation and Research
关键词
印度洋9.0级大地震
中国数字地震台(CDSN)
功率谱密度估计
地球自由振荡
earthquake in the Indian Ocean, China Digital Seismograph Network, powerspectral density estimation, spheroidal free oscillation of the earth
