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| Wavelet filter analysis of splitting and coupling of seismic normal modes below 1.5 mHz with superconducting gravimeter records after the December 26, 2004 Sumatra earthquake | |
| 作者姓名： | Jacques Hinderer |
| 作者单位： | HU Xiaogang,KE Xiaoping(Institute of Geodesy and Geophysics,Chinese Academy of Sciences,Wuhan,430077,China;Graduate University of Chinese Academy of Sciences,Beijing,100049,China);LIU Lintao,SUN Heping,XU Houze(Institute of Geodesy and Geophysics,Chinese Academy of Sciences,Wuhan,430077,China);Jacques Hinderer(Institut de Physique du Globe de Strasbourg (UMR 7516 CNRS-ULP),5 rue Descartes,67084 Strasbourg Cedex,France) |
| 基金项目： | 国家自然科学基金，中国科学院"百人计划"，中国科学院知识创新工程项目 |
| 摘 要： | New generation superconducting gravimeters (SGs), which have been demonstrated to be better than the best seismometers STS-1 at frequencies below 1 mHz, can be accepted as the quietest vertical seismometers for observation of long-period earth free oscillations. Wavelet filtering with narrow band-pass frequency response as shown in this paper is very helpful in removing at- mospheric pressure effects from on gravity records in long-period seismic mode frequency bands. The processing of high quality SG records after the great Sumatra earthquake (Dec. 26, 2004) with wavelet filtering leads to clear observations of all coupled toroidal modes below 1.5 mHz except these for 0T5, 0T7 and 1T1; moreover 1T2 and 1T3 are, for the first time, unambiguously revealed in the vertical components of the free oscillations. The three well-resolved splitting singlets of overtones 2S1 are observed from a single SG record for the first time. |
| 收稿时间： | 28 June 2005 |
| 修稿时间： | 28 February 2006 |
Wavelet filter analysis of splitting and coupling of seismic normal modes below 1.5 mHz with superconducting gravimeter records after the December 26,2004 Sumatra earthquake |
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| Jacques Hinderer.Wavelet filter analysis of splitting and coupling of seismic normal modes below 1.5 mHz with superconducting gravimeter records after the December 26, 2004 Sumatra earthquake[J].Science in China(Earth Sciences),2006,49(12):1259-1269. | |
| Authors: | HU Xiaogang LIU Lintao SUN Heping XU Houze Jacques Hinderer KE Xiaoping |
| Institution: | 1. Institute of Geodesy and Geophysics,Chinese Academy of Sciences,Wuhan,430077,China;Graduate University of Chinese Academy of Sciences,Beijing,100049,China 2. Institute of Geodesy and Geophysics,Chinese Academy of Sciences,Wuhan,430077,China 3. Institut de Physique du Globe de Strasbourg (UMR 7516 CNRS-ULP),5 rue Descartes,67084 Strasbourg Cedex,France |
| Abstract: | New generation superconducting gravimeters (SGs), which have been demonstrated to be better than the best seismometers STS-1 at frequencies below 1 mHz, can be accepted as the quietest vertical seismometers for observation of long-period earth free oscillations. Wavelet filtering with narrow band-pass frequency response as shown in this paper is very helpful in removing at- mospheric pressure effects from on gravity records in long-period seismic mode frequency bands. The processing of high quality SG records after the great Sumatra earthquake (Dec. 26, 2004) with wavelet filtering leads to clear observations of all coupled toroidal modes below 1.5 mHz except these for 0T5, 0T7 and 1T1; moreover 1T2 and 1T3 are, for the first time, unambiguously revealed in the vertical components of the free oscillations. The three well-resolved splitting singlets of overtones 2S1 are observed from a single SG record for the first time. |
| Keywords: | superconducting gravimeter Sumatra earthquake wavelet filter Earth free oscillations pressure correction |
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