›› 2013, Vol. 42 ›› Issue (4): 0-0.

• 学术论文 •    

利用超导重力数据检测汶川地震激发的球型地球自由振荡

许闯1,罗志才2,周波阳1,林旭1   

  1. 1. 武汉大学测绘学院
    2. 武汉大学测绘学院,地球空间环境与大地测量教育部重点实验室
  • 收稿日期:2012-07-06 修回日期:2012-12-24 出版日期:2013-08-20 发布日期:2014-01-23
  • 通讯作者: 许闯 E-mail:xuchuang526610@163.com
  • 基金资助:
    国家自然科学基金项目;中央高校基本科研业务费专项资金项目

Detecting Spheroidal Mode of Earth’s Free Oscillations Excitated by Wenchuan Earthquake Using Superconducting Gravity observations

  • Received:2012-07-06 Revised:2012-12-24 Online:2013-08-20 Published:2014-01-23

摘要: 本文利用Canberra、Matsushiro、Membach和Metsahovi四个台站2008年5月的超导重力数据对汶川8.0级大地震激发的球型地球自由振荡进行了研究。结果表明:0S0~0S48全部基频振型以及1S4、2S4和3S1三个谐频振型与PREM模型的误差在0.02‰~1.93‰,且所有振型的信噪比均大于阈值3,表明本文的计算方法是有效的,计算结果是可信的;0S2、0S3和0S4存在谱线分裂现象,其谱线分裂率 为1.09340、0.67430和1.07100,验证了地球自转和椭率是引起0S2、0S3和0S4谱线分裂的主要原因。

关键词: 球型地球自由振荡, 汶川地震, 超导重力, 谱线分裂, PREM模型

Abstract: Spheroidal modes of Earth’s free oscillation excitated by Wenchuan Ms8.0 Earthquake are detected by superconducting gravity observations of Canberra、Matsushiro、Membach and Metsahovi in may, 2008. Results show that the errors of 0S0 to 0S48、1S4、2S4 and 3S1 are between 0.02‰ and 1.93‰ compared with the PREM model, and their signal-to-noise ratios are all bigger than 3. It is shown that the calculation methods are effective and the calculation results are credible. The spectra splittings of the 0S2、0S3 and 0S4 are observed, and their ratios are 1.09340、0.67430 and 1.07100. It is proved that Earth’s rotation and ellipticity are taken as main reasons of the spectra splittings.

Key words: Earth’s free oscillation, Wenchuan Earthquake, superconducting gravity observations, spectra splitting, PREM model

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