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印度洋9.0级大地震激发的地球球型振荡和环型振荡
引用本文:于海英,朱元清,寿海涛.印度洋9.0级大地震激发的地球球型振荡和环型振荡[J].地球物理学进展,2006,21(3):706-716.
作者姓名:于海英  朱元清  寿海涛
作者单位:上海市地震局,上海 200062
基金项目:致谢:作者所用地震数据来自中国数字地震台网(CDSN)数据中心,PREM数据由万永革博士提供,在此表示感谢.
摘    要:综合分析了中国数字地震台网(CDSN)改造后的5个长周期地震仪台站观测的3天的VHZ、VHE和VHN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0S3~0S78的基频球型振荡和部分谐频球型振荡和0T3~0T67的基频环型振荡,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预测的振荡周期符合的很好.频率与PREM模型略微不一致的球型或环型振荡可以解释为地球介质的横向不均匀性和各向异性所致.因此地球自由振荡信息可用于揭示地球的三维不均匀结构信息或各向异性信息,并可能对区分地幔对流模式有所帮助.

关 键 词:印度洋9.0级大地震  中国数字地震台网(CDSN)  功率谱密度估计  地球自由振荡检测
文章编号:1004-2903(2006)03-0706-11
收稿时间:2005-11-10
修稿时间:2006-02-20

Toroidal and spheroidal mode of the earth's free oscilation excited by the indian ocean earthquake
YU Hai-ying,ZHU Yuan-qing,SHOU Hai-tao.Toroidal and spheroidal mode of the earth''''s free oscilation excited by the indian ocean earthquake[J].Progress in Geophysics,2006,21(3):706-716.
Authors:YU Hai-ying  ZHU Yuan-qing  SHOU Hai-tao
Institution:Seismological Bureau of Shanghai, Shanghai 200062, China
Abstract:Five stations of China digital seismograph network(CDSN) record VHZ,VHE and VHN data of Indian ocean earthquake(Dec,26,2004) fot three days.We extractes spheroidal mode of(_0S_3)~(_0S_(78)) and toroidal mode of(_0T_3)~(_0T_(67)) of the earth free oscillation using power spectral density(PSD) estimation.Because the frequency band of seismograph in China digital seismograph network suppress information of solid tide,it is not necessary to remove the solid tide in our process.Our result is almost consistent with frequency of the modes of preliminary reference earth model(PREM).The inconsistent modes of spheroidal and toroidal free oscillation may result from lateral heterogeneous or /and anisotropic media of the earth.Thus the data of the earth spheroidal and toroidal free oscillation can be used to explore the 3-dimensional structure(density structure,velocity structure) or anisotropy of the earth and help to disclose the convection mode in the whole mantle or in the upper mantle.
Keywords:China Digital Seismograph Network  Power spectral density estimation  Spheroidal free oscillation of the earth  Toroidal free oscillation of the earth
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