长春台体应变仪器观测到的地球基频球型振荡  

EARTH FUNDAMENTAL SPHERICAL OSCILLATION OBSERVED BY THE BULK STRAIN OF CHANGCHUN SEISMIC STATION

作　　者：刘冰冰[1] 杨耀文[2] 任佳[3] 蒋翠荣[3] 范金梅[4] 

机构地区：[1]吉林省地震局,吉林长春130117 [2]云南省地震局丽江地震台,云南丽江674100 [3]河北省地震局张家口中心地震台,河北张家口075000 [4]河北省地震局怀来地震台,河北怀来075400

出　　处：《东北地震研究》2009年第4期22-25,共4页Seismological Research of Northeast China

摘　　要：本文分析了2004年12月26日苏门答腊M9.0级大地震后5天的长春台体应变观测资料,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,较准确地获得了大地震激发的基频球型振荡,并与地球初步参考模型(PREM)的理论自由振荡频率进行了对比,发现实测振荡频率与PREM预测的振荡频率基本符合。The purpose of this paper is to analyze the bulk strain observation data of Changchun Seismic Station at 5 days after a destructive earthquake of magnitude 9.0 in Sumatra on 26th Dec, 2004. We＇utilize the estimate method of power spectrum density and comparatively accurately acquire fundamental spherical oscillation caused by violent earthquake without dealing with data on getting rid of earth tide. Furthermore we compare it with the theory of PREM--free oscillation frequency, and find out observed oscillation frequency basically accords with the oscillation frequency forecasted by PREM.

关 键 词：体应变 苏门答腊9.0级大地震 地球自由振荡 球型振荡 

分 类 号：P315.63[天文地球—地震学]