DETECTING FREE OSCILLATION OF EARTH BY USE OFOBSERVATIONS OF EXTENSOMETER
Yang Yuewen 1) ; Ren Jia 2) ; Yang Xing 3) ; Yang Lingying 3) ;He Yuquan 1) ; and Li Lihong 1)
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
Abstract With power spectrum density estimation method, we extract the spheroidal free oscillation of fundamentalfrequency(0S3～0S26) of the earth excited by the M9.0 SumatraAndaman 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.
Key words ：
extensometer
M9.0 Sumatra earthquake
PREM model
free oscillation
spheroidal oscillation
Received: 01 January 1900
Corresponding Authors:
Yang Yuewen
Cite this article:
Yang Yuewen ,Ren Jia ,Yang Xing et al. DETECTING FREE OSCILLATION OF EARTH BY USE OFOBSERVATIONS OF EXTENSOMETER[J]. , 2010, 30(Supp.1): 78-80.
Yang Yuewen ,Ren Jia ,Yang Xing et al. DETECTING FREE OSCILLATION OF EARTH BY USE OFOBSERVATIONS OF EXTENSOMETER[J]. jgg, 2010, 30(Supp.1): 78-80.
URL:
http://www.jgg09.com/EN/ OR http://www.jgg09.com/EN/Y2010/V30/ISupp.1/78
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