[1]YANG Yue-wen,QIN Jia-zheng,Ren Jia,et al.Detecting the Free Oscillation of the Earth through the Observational Data of Water-tube Tiltmeters in Yunnan[J].Journal of Seismological Research,2010,33(02):189-194.
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Detecting the Free Oscillation of the Earth through the Observational Data of Water-tube Tiltmeters in Yunnan
Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume:
33
Number of periods:
2010 02
Page number:
189-194
Column:
Public date:
2010-02-01
- Title:
- Detecting the Free Oscillation of the Earth through the Observational Data of Water-tube Tiltmeters in Yunnan
- Keywords:
- water-tube tiltmeter; M9.0 Sumatra-Andaman earthquake; free oscillation of the Earth; spheroidal oscillation
- CLC:
- P315.3
- DOI:
- -
- Abstract:
- By power spectrum density estimation,we extract the fundamental-frequency,spheroidal,free oscillation(0S3～0S26)of the Earth excited by the M9.0 Sumatra-Andaman great earthquake on 26 December 2004 from the data of digital water-tube tiltmeters from Yunlong seismic station,Yongsheng seismic station,and Chuxiong seismic station in Yunnan Province without eliminating the Earth's tide.Comparing the extracted free oscillation with those observed by Benioff with the strainmeter Isabella and by Ness with the gravimeter Lacoste-Romberg and referring to the period of the extracted oscillation with that of the theoretical oscillation from the Preliminary Reference Earth Model(PREM),we find that they are in very good accordance with each other; the relative errors of 0S4 period,period 1,period 2,period 3 are greater than 0.3% while the relative errors of other periods are less than 3‰.This proves that extracting the free oscillation of the Earth from the data of digital water tube tiltmeter is a new approach.
- References:
- -
- Similar References:
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Last Update:
2010-02-23