摘要
利用中国数字地震台网(CDSN)5个台站的波形资料,采用功率谱密度估计方法,提取了智利地震激发的地球球型自由振荡,并与地球初步参考模型(PREM)的理论自由振荡周期进行对比,发现球型振荡振型周期与地球初步参考模型预测的球型自由振荡周期基本吻合。所得结果可以进一步用来研究地震震源机制和地球内部结构,并对大地震的震源破裂分布给出一定的约束。
Based on waveform data recorded by 5 stations of China Digital Seismic Network（CDSN）,using the power spectral density（PSD） estimation method,we extracted spheroidal mode of the earth free oscillation excited by the Chile earthquake.They are consistent and nearly same with the frequencies of the modes of Preliminary Reference Earth Model（PREM）.The results can be further used to study the focal mechanism and the Earth＇s interior structure,and give certain constraints on the big earthquake rupture distribution.
出处
《防灾科技学院学报》
2012年第1期12-16,共5页
Journal of Institute of Disaster Prevention
关键词
中国数字地震台网
智利地震
功率谱密度估计
地球球型自由振荡
China Digital Seismic Network
Chile earthquake
power spectral density estimation
spheroidal free oscillation of the earth
