利用伸缩仪观测资料检测地球自由振荡

英文篇名：DETECTING FREE OSCILLATION OF EARTH BY USE OF OBSERVATIONS OF EXTENSOMETER
中文刊名：大地测量与地球动力学
英文刊名：Journal of Geodesy and Geodynamics
作者：杨跃文 ; 任佳 ; 杨星 ; 杨玲英 ; 和玉权 ; 李丽红
英文作者：Yang Yuewen1) ; Ren Jia2) ; Yang Xing3) ; Yang Lingying3) ; He Yuquan1) and Li Lihong1) (1) Lijiang Seismostation ; Earthquake Administration of Yunnan Province ; Lijiang 6741002) Zhangjiakou Central Seismostation ; Earthquake Administration of Hebei Province ; Zhangjiakou 0750003) Earthquake Administration of Yunnan Province ; Kunming 650224)
中文关键词：伸缩仪 ; 苏门答腊9.0级地震 ; PREM模型 ; 自由振荡 ; 球形振荡
英文关键词：extensometer ; M9.0 Sumatra earthquake ; PREM model ; free oscillation ; spheroidal oscillation
出版日期：2010-08-15
机构：云南省地震局丽江地震台;河北省地震局张家口中心台;云南省地震局;
年：2010
期：S1
出版单位：大地测量与地球动力学

摘要

运用云南省云龙地震台和山东省泰安地震台伸缩仪的数字化观测资料,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,准确地获得了2004年12月26日苏门答腊9.0级地震激发的0S3~0S26基频球形自由振荡,并与地球初步参考模型PREM的理论自由振荡周期进行了对比,发现实测振荡周期与PREM预测的振荡周期基本相一致。
With power spectrum density estimation method,we extract the spheroidal free oscillation of fundamental-frequency(0S3～0S26) of the earth excited by the M9.0 Sumatra-Andaman great earthquake on 26 December 2004 from the data of digital extensometer at Yunlong seismostation in Yunnan province and at Taian seismostation in Shandong province without eliminating the earth's tide.Comparing the period of the extracted oscillation with that of the theoretical oscillation by using the Preliminary Reference Earth Model(PREM),it is found that they are accordant with each other.

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