Detecting the Free Oscillations of the Earth Excited by the Japan
详细信息
- 责任者：Yao Jiajun (Earthquake Administration of Qinghai Province ; Xining 810000 ; China) ; Wan Yongge
- 刊名：Journal of Seismological Research
- 出版年：2012
- 卷期：35(1)
- 关键词：地球自由振动 ; Earth free oscillation ; 重力勘探 ; gravity exploration ; 大震 ; great earthquakes ; 日本 ; Japan
- 页码：p.53-58
- 图表：4 illus., 1 table, 19 refs.
- 分类号：0500
- issnNo：ISSN1000-0666
- isbnNo：CN53-1062/P
摘要
By use of the gravity digital observation data recorded at Golmud Reference Seismological Station,we detect the spherical free oscillation between the mode of 0S0 and 0S40 stimulated by the M9.0 earthquake occurred on March 11,2011 in Japan.The difference between the theoretical and the observed frequency values of the mode of 0S0、 0S13、 0S22、 0S26、 0S30 is almost zero.Meanwhile,we find that the mode of 0S2 and 0S3 have the phenomenon of spectra line splitting.But it is difficult to identify the mode of 0S32 and 0S37,because they are drowned in the noises.The whole mean deviation is about 0.10%,which shows that there is a good agreement between observed and theoretical frequency values.The results not only suggest the validity of the theory of Preliminary Reference Earth Model,but also show the excellent of gravity data recorded at Golmud Reference Seismological Station,so it maybe helpful to understand the structure in deep earth.