长春台体应变仪器观测到的地球基频球型振荡

英文篇名：EARTH FUNDAMENTAL SPHERICAL OSCILLATION OBSERVED BY THE BULK STRAIN OF CHANGCHUN SEISMIC STATION
中文刊名：东北地震研究
英文刊名：Seismological Research of Northeast China
作者：刘冰冰 ; 杨耀文 ; 任佳 ; 蒋翠荣 ; 范金梅
英文作者：LIU Bing-bing1 ; YANG Yao-wen2 ; REN Jia3 ; JIANG Cui-rong3 ; FAN Jin-mei4(1.Earthquake Administration of Jilin Province ; Jilin Changchun 130117 ; China ; 2.Lijiang Central Seismic Station ; Yunnan Lijiang 674100 ; China ; 3.Zhangjiakou Central Seismic Station ; Hebei Zhangjiakou 075000 ; China ; 4.Huailai Seismic Station ; Hebei Huailai 075400 ; China)
中文关键词：体应变 ; 苏门答腊9.0级大地震 ; 地球自由振荡 ; 球型振荡
英文关键词：bulk strain ; violent earthquake of M 9.0 in Sumatra ; earth free oscillation ; spherical oscillation
出版日期：2009-12-15
机构：吉林省地震局;云南省地震局丽江地震台;河北省地震局张家口中心地震台;河北省地震局怀来地震台;
年：2009
期：04
出版单位：东北地震研究

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.

引文

[1]Lamb H.1882.On the variations of an elastic sphere[J].Lond.Math.Soc.Proc,13:233-256.
    [2]Benioff H,Press F,Smith S.1961.Excitation of the free oscillations of the earth by earthquakes[J].Geophys Res,66(2):605-619.
    [3]吕永清,蔡亚先,周云耀.1997.用JCZ-1超宽频带数字地震仪观测地球自由振荡[J].地壳形变与地震,17(3):103-105.
    [4]雷湘鄂,许厚泽,孙和平.2002.利用超导重力观测资料检测地球自由振荡[J].科学通报,47(18):1432-1436.
    [5]雷湘鄂,许厚泽,孙和平.2004.由5个国际超导重力仪台站资料检测到的秘鲁8.2级大地震所激发的球型自由振荡现象[J].中国科学(D辑),34(5):483-491.
    [6]万永革,周公威,郭燕平.2005.中国数字地震台网记录的昆仑山口西地震的球型自由振荡[J].地震,25(1):31-40.
    [7]万永革.2007.数字信号处理的MATLAB实现[M].北京:科学出版社,252-279.
    [8]Park J,Song T A,Tromp J,et al.2005.Earth's free oscillations excited by the 26 December 2004 Sumatra Andaman earthquake[J].Science,308:1139-1146.
    [9]Beroza G C,Jordan T H.1990.Searching for slow and silent earthquakes using free oscillations[J].Geophys Res,95(B3):2485-2510.