对两次印尼地震环型振荡剪应变方向的分析
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摘要
利用泰安台YRY-2型钻孔差应变仪的观测资料,研究了两次印尼苏门答腊地震的环型振荡的剪应变方向。首先对差应变仪观测数据进行实地标定,然后用标定后的数据检测2004年12月26日和2005年3月28日印尼苏门答腊两次大地震激发的环型振荡,发现基频环型振荡0T11~0T18最明显,且两次地震的振幅变化趋势基本一致。两次地震得到的0T11~0T18型环型振荡的最大剪应变方向随时间变化比较小。通过与理论预期的对比,发现实测值的平均值与理论值之差仅为2°。这不仅证实了理论模型的正确性,同时也证实了该观测的可靠性。
Using observations of the YRY-2 borehole shear strainmeter,we studied maximum shear strain orientation of the earth's torsional oscillation excited by two Sumatra earthquake occurred on December 26,2004 and March 28,2005.Firstly,we did in-situ calibration for the data of borehole shear strainmeter and then detected the torsional oscillations.It is found that fundamental torsional modes-0T-11～-0T-18 were very obvious and variation trend of the two earthquakes' amplitude were in agreement with each others,and variations of maximum shear strain orientations with time of fundamental torsional modes-0T-11～-0T-18 of the two Sumatra earthquakes are small.Through the comparison,we found that the D-value of the mean measured value with theoretical anticipation value was only 2°.On the one hand,it comfirmed the theoretical model,on the other hand it also comfirmed that this observation was reliable.
Using observations of the YRY-2 borehole shear strainmeter,we studied maximum shear strain orientation of the earth's torsional oscillation excited by two Sumatra earthquake occurred on December 26,2004 and March 28,2005.Firstly,we did in-situ calibration for the data of borehole shear strainmeter and then detected the torsional oscillations.It is found that fundamental torsional modes-0T-11～-0T-18 were very obvious and variation trend of the two earthquakes' amplitude were in agreement with each others,and variations of maximum shear strain orientations with time of fundamental torsional modes-0T-11～-0T-18 of the two Sumatra earthquakes are small.Through the comparison,we found that the D-value of the mean measured value with theoretical anticipation value was only 2°.On the one hand,it comfirmed the theoretical model,on the other hand it also comfirmed that this observation was reliable.
引文
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2 Dziewonski AMand Gillbert F.Observation of normal modesfrom84 recordings of the Alaskan earthquakes of1964 March28[J].Geophys.J.R.Astr.Soc.1972,27:393-446.
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5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):1 432-1436. Lei Xiang’e,Xu Houze and Sun Heping.Using the datafrom superconducting gravimeters to detect the Earth’s freeoscillations[J].Chinese Science Bulletin,2002,47(18):1432-1 436.(in Chinese)
6雷湘鄂,许厚泽,孙和平.由5个国际超导重力仪台站资料检测到的秘鲁8.2级大地震所激发的球型自由振荡现象[J].中国科学D辑(地球科学),2004,34(5):483-491. Lei Xiang’e,Xu Houze and Sun Heping.Detection of spher-iodal free oscillation excited by PeruMs8.2 earthquake withfive international superconducting gravimeter data[J].Sci-ence in China Series D:Earth Sciences,2004,34(5):483-491.(in Chinese)
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8邱泽华,等.钻孔差应变仪观测的苏门答腊地震激发的地球环型振荡[J].地球物理学报,2007,50(3):797-805. Qiu Zehua,et al.Earth’s free torsional oscillations of thegreat Sumatra earthquake observed with borehole strainmeter[J].Chinese Journal of Geophysics,2007,50(3):797-805.(in Chinese)
9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. Tang Lei,Qiu Zehua and Kan Baoxiang.Earth’s spheroidaloscillations observed with China borehole dilatometer net-work.[J].Chinese Journal of Geophysics,2007,27(6):37-44.(in Chinese)
10阚宝祥,邱泽华,唐磊.泰安台钻孔差应变观测的实地标定[J].大地测量与地球动力学,2007,27(6):119-123. Kan Baoxiang,Qiu Zehua and Tang Lei.In-situ calibra-tion of borehole shear strainmeter at taian station[J].Chi-nese Journal of Geophysics,2007,27(6):119-123.(inChinese)
11骆鸣津,等.用引潮力进行钻孔应变一应力的原地标定[J].地壳形变与地震,1989,9(4):51-62. Luo Mingjin,et al.Borehole strain-stress calibration in thesame place by use of tidal generation force[J].Crustal De-formation and Earthquake,1989,9(4):51-62.(in Chi-nese)
12郑治真.波谱分析基础[M].北京:地震出版社,1979.Zheng Zhizhen.Fundamental Analysis[M].Beijing:Seis-mological Press,1979.(in Chinese)
13 Dziewonski A M and Anderson D L.Preliminary referenceearth model[J].Phys.Earth Planet.Int.,1981,25:297-356.
14邱泽华,石耀霖,欧阳祖熙.四分量钻孔应变观测的实地相对标定[J].大地测量与地球动力学,2005,1:118-122. Qiu Zehua,Shi Yaolin and Ouyang Zuxi.Relative in-situcalibration of 4-component borehole strain observation[J].Journal of Geodesy and Geodynamics,2005,25(1):118-122.(in Chinese)
15邱泽华,石耀霖,欧阳祖熙.四分量钻孔应变观测的实地绝对标定[J].地震,2005,3:27-34. Qiu Zehua,Shi Yaolin and Ouyang Zuxi.Absolute in-situcalibration of 4-component borehole strain observation[J].Earthquake,2005,25(3):27-34.(in Chinese)
16 Aki K and Richards P G.Quantitative seismology-Theoryand methods(Volume I)[M].San Francisco:W.H.Freeman and Company,1980.
2 Dziewonski AMand Gillbert F.Observation of normal modesfrom84 recordings of the Alaskan earthquakes of1964 March28[J].Geophys.J.R.Astr.Soc.1972,27:393-446.
3 Park J,Song TA,Tromp J,et al.Earth’s free oscillationsexcited by the 26 December 2004 Sumatra-Andaman earth-quake[J].Science,2005,308:1 139-1 146.
4 Lambotte S,Rivera L and Hinderer J.Rupture length andduration of the 2004 Aceh-Sumatra earthquake from thephases of the Earth’s gravest free oscillations[J].Geophys-ical Research Letters,2005,33:L03307.
5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):1 432-1436. Lei Xiang’e,Xu Houze and Sun Heping.Using the datafrom superconducting gravimeters to detect the Earth’s freeoscillations[J].Chinese Science Bulletin,2002,47(18):1432-1 436.(in Chinese)
6雷湘鄂,许厚泽,孙和平.由5个国际超导重力仪台站资料检测到的秘鲁8.2级大地震所激发的球型自由振荡现象[J].中国科学D辑(地球科学),2004,34(5):483-491. Lei Xiang’e,Xu Houze and Sun Heping.Detection of spher-iodal free oscillation excited by PeruMs8.2 earthquake withfive international superconducting gravimeter data[J].Sci-ence in China Series D:Earth Sciences,2004,34(5):483-491.(in Chinese)
7万永革,等.中国数字地震台网记录的昆仑山口西地震的球型自由振荡[J].地震,2005,25(1):31-40. Wan Yongge,et al.Spherical mode of the earth free oscilla-tion excitated by the earthquake in the west to the Kunlunmountain pass recorded by China digital seismograph network[J].Earthquake,2005,25(1):31-40.(in Chinese)
8邱泽华,等.钻孔差应变仪观测的苏门答腊地震激发的地球环型振荡[J].地球物理学报,2007,50(3):797-805. Qiu Zehua,et al.Earth’s free torsional oscillations of thegreat Sumatra earthquake observed with borehole strainmeter[J].Chinese Journal of Geophysics,2007,50(3):797-805.(in Chinese)
9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. Tang Lei,Qiu Zehua and Kan Baoxiang.Earth’s spheroidaloscillations observed with China borehole dilatometer net-work.[J].Chinese Journal of Geophysics,2007,27(6):37-44.(in Chinese)
10阚宝祥,邱泽华,唐磊.泰安台钻孔差应变观测的实地标定[J].大地测量与地球动力学,2007,27(6):119-123. Kan Baoxiang,Qiu Zehua and Tang Lei.In-situ calibra-tion of borehole shear strainmeter at taian station[J].Chi-nese Journal of Geophysics,2007,27(6):119-123.(inChinese)
11骆鸣津,等.用引潮力进行钻孔应变一应力的原地标定[J].地壳形变与地震,1989,9(4):51-62. Luo Mingjin,et al.Borehole strain-stress calibration in thesame place by use of tidal generation force[J].Crustal De-formation and Earthquake,1989,9(4):51-62.(in Chi-nese)
12郑治真.波谱分析基础[M].北京:地震出版社,1979.Zheng Zhizhen.Fundamental Analysis[M].Beijing:Seis-mological Press,1979.(in Chinese)
13 Dziewonski A M and Anderson D L.Preliminary referenceearth model[J].Phys.Earth Planet.Int.,1981,25:297-356.
14邱泽华,石耀霖,欧阳祖熙.四分量钻孔应变观测的实地相对标定[J].大地测量与地球动力学,2005,1:118-122. Qiu Zehua,Shi Yaolin and Ouyang Zuxi.Relative in-situcalibration of 4-component borehole strain observation[J].Journal of Geodesy and Geodynamics,2005,25(1):118-122.(in Chinese)
15邱泽华,石耀霖,欧阳祖熙.四分量钻孔应变观测的实地绝对标定[J].地震,2005,3:27-34. Qiu Zehua,Shi Yaolin and Ouyang Zuxi.Absolute in-situcalibration of 4-component borehole strain observation[J].Earthquake,2005,25(3):27-34.(in Chinese)
16 Aki K and Richards P G.Quantitative seismology-Theoryand methods(Volume I)[M].San Francisco:W.H.Freeman and Company,1980.
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