用SSY伸缩仪资料研究巨大远震引起的振荡波及谱
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摘要
选取四川省姑咱台和攀枝花南山台SSY石英伸缩仪观测资料,对2004年12月26日印尼苏门答腊Ms8.7地震、2003年9月26日日本北海道Ms8.0地震和2003年9月27日俄、蒙、中交界Ms7.9地震激发的振荡波列进行小波分解及谱分析,并与日常观测记录的分析结果比较。结果显示SSY石英伸缩仪记录资料给出的巨大远震激发的振荡波时间滞后,振荡波列的小波分解得到的谱结构的主要几种频率成分,与地球自由振荡的某些振型是一致的。
On the basis of the observations of SSY quartz extensometers at Guza and Panzhihua-Nanshan stations in Sichuan province,the oscillation wave trains excited by the Sumatra Ms8.7 earthquake on December 26,2004 in Indonesia,the Hokkaido Ms8.0 earthquake on September 26,2003 in Japan and the Ms7.9 earthquake on September 27,2003 on the borders of Russia,Mongolia and China were decomposed by wavelet transform and the spectrum analysis were done,and the analysis results were compared with the usual observation records.The time of oscillation waves excited by great far-field earthquake from SSY quartz extensometer observation data lags,several main frequency components of spectrum structure obtained by decomposing oscillation wave trains are in accordance with some modes of earth’s free oscillations.
On the basis of the observations of SSY quartz extensometers at Guza and Panzhihua-Nanshan stations in Sichuan province,the oscillation wave trains excited by the Sumatra Ms8.7 earthquake on December 26,2004 in Indonesia,the Hokkaido Ms8.0 earthquake on September 26,2003 in Japan and the Ms7.9 earthquake on September 27,2003 on the borders of Russia,Mongolia and China were decomposed by wavelet transform and the spectrum analysis were done,and the analysis results were compared with the usual observation records.The time of oscillation waves excited by great far-field earthquake from SSY quartz extensometer observation data lags,several main frequency components of spectrum structure obtained by decomposing oscillation wave trains are in accordance with some modes of earth’s free oscillations.
引文
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3牛安福,等.印尼强地震引起的同震形变波[J].地震,2006,26(1):131-137.3Niu Anfu,et al.Co-seismic deformation waves caused by In-donesia earthquake[J].Earthquake,2006,26(1):131-137.(in Chinese)
4雷湘鄂,许厚泽,孙和平.利用超导重力观测资料检测地球自由振荡[J].科学通报,2002,47(18):1432-1436.4Lei Xiang-e,Xu Houze and Sun Heping.Using observations with superconducting gravimeter to detect the Earth’s free oscillation[J].Science Bulletin,2002,47(18):1432-1436.(in Chinese)
5邱泽华,等.钻孔差应变仪观测的苏门答腊大地震激发的地球环型自由振荡[J].地球物理学报,2007,50(3):797-805.5Qiu Zehua,et al.Earth’s free torsional oscillations of the great Sumatra earthquake observed with borehole shear strainmeter[J].Chinese J.Geophys,2007,50(3):797-805.(in Chinese)
6唐磊,邱泽华,阚宝祥.中国钻孔体应变台网观测到的地球球型振荡[J].大地测量与地球动力学,2007,27(6):37-44.6Tang Lei,Qiu Zehua and Kan Baoxiang.Earth’s spheroidal oscillations observed with China borehole dilatometer network[J].Journal of Geodesy and Geodynamics,2007,27(6):37-44.(in Chinese)
7B A Bolt,R G Currie and J R Astron.Maximum entropy esti-mates of earth torsional eigenperiods from1960Trieste data[J].Geophysical Journal International,1975,40(1):107-114.
8M Zadro and C Braitenberg.Measurements and interpreta-tions of tilt-strain gauges in seismically active areas[J].Earth Science Reviews,1999,47:151-187.
9宋治平,等.小波分析方法在形变数字化资料处理中的应用[J].大地测量与地球动力学,2003,23(4):21-27.9Song Zhiping,et al.Application of wavelet transform to analy-sis of digital deformation data[J].Journal of Geodesy and Geodynamics,2003,23(4):21-27.(in Chinese)
10万永革,等.中国大陆及华北地区地震资料的小波分析[J].大地测量与地球动力学,2003,23(4):28-33.10Wan Yongge,et al.Wavelet analysis of seismic data in Chi-nese mainland and North China[J].Journal of Geodesy and Geodynamics,2003,23(4):28-33.(in Chinese)
11张燕,等.潮汐形变资料中地震前兆信息的识别与提取[J].大地测量与地球动力学,2003,23(4):34-39.11Zhang Yan,et al.Identification and extraction of earthquake precursor from tidal deformation data[J].Journal of Geode-sy and Geodynamics,2003,23(4):34-39.(in Chinese)
12曾融生.固体地球物理学导论[M].北京:科学出版社,1984.12Zeng Rongsheng.The introduction to soild geophysics[M].Beijing:Science Press,1984.(in Chinese)
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