利用重力资料检测日本9.0级地震激发的地球自由振荡
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摘要
利用格尔木基准地震台重力观测资料,检测到2011年3月11日日本东海岸9.0级特大地震激发0S0～0S40之间的球型自由振荡,其中有0S0、0S13、0S22、0S26、0S30共5个振型的观测频率值与理论频率值偏差近似为0。同时发现0S2、0S3振型有明显的谱线分裂现象,但是0S32、0S37振型未与周围噪音区分开,观测效果不明显。整体平均偏差约为0.10%,观测频率值与理论频率值有很好的相符,这不但说明了PREM模型理论的正确性,也说明了格尔木基准地震台重力资料质量的优良,研究结果对了解地球内部结构有一定的帮助。
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.
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.
引文
方明.1991.地球自由振荡——正演、反演理论中若干问题的研究[D].北京:中国科学院测量与地球物理研究所.
雷湘鄂,孙和平,许厚泽,等.2007.苏门达腊大地震激发的地球自由振荡及其谱线分裂的检测与讨论[J].中国科学D辑:地球科学,37(4):504-511.
雷湘鄂,许厚泽,孙和平.2002.利用超导重力观测资料检测地球自由振荡[J].科学通报,47(18):1432-1436.
雷湘鄂,许厚泽,孙和平.2004.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,34(5):483-491.
邱泽华,马瑾,池顺良,等.2007.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,50(3):797-805.
任佳,陈华静,蒋翠荣,等.2009.数字化水位仪观测的苏门答腊大地震激发的地球球型自由振荡[J].地震研究,32(4):333-338.
唐磊,邱泽华,阚宝祥.2007.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,27(6):37-44.
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万永革,周公威,郭燕平,等.2004.昆仑山口西地震激发的地球环型振荡[J].防灾减灾工程学报,24(1):1-7.
万永革,周公威,郭燕平.2005.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,25(1):31-40.
万永革.2007.数字信号处理的MATLAB实现[M].北京:地震出版社.
徐晓枫,万永革,王惠琳.2010.由中国CDSN台网检测到的汶川地震所激发的地球球型自由振荡[J].地震,30(1):36-49.
杨跃文,秦嘉政,任佳,等.2010.利用云南水管仪观测资料检测地球自由振荡[J].地震研究,33(2):189-194.
于海英,朱元清,寿海涛.2006.印度洋9.0级大地震激发的地球球型振荡和环型振荡[J].地球物理学进展,21(3):706-716.
Benioff H,Press F,Smith S.1961.Excitation of the free oscillations of the earth by earthquake[J].J Geophys Res,66(2):605-619.
Dahlen F A.1968.The normal modes of a rotating,elliptical earth[J].Geophys J Rastr,16(4):329-367.
Dahlen F A.1969.The normal modes of a rotating,elliptical earth——11near-resonance multiplet coupling[J].Geophys J Rastr,18(4):397-436.
Ness N R,Harrison C T,Slichter L B.1961.Observation of the free oscil-lation of the earth[J].J Geophys Res,66(2):621-629.
Widmer-Schnidrig R.1999.Free oscillations illuminate the mantle[J].Nature,398:292-293.
雷湘鄂,孙和平,许厚泽,等.2007.苏门达腊大地震激发的地球自由振荡及其谱线分裂的检测与讨论[J].中国科学D辑:地球科学,37(4):504-511.
雷湘鄂,许厚泽,孙和平.2002.利用超导重力观测资料检测地球自由振荡[J].科学通报,47(18):1432-1436.
雷湘鄂,许厚泽,孙和平.2004.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,34(5):483-491.
邱泽华,马瑾,池顺良,等.2007.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,50(3):797-805.
任佳,陈华静,蒋翠荣,等.2009.数字化水位仪观测的苏门答腊大地震激发的地球球型自由振荡[J].地震研究,32(4):333-338.
唐磊,邱泽华,阚宝祥.2007.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,27(6):37-44.
万永革,盛书中,周公威,等.2007.中国数字地震台网记录的苏门答腊—安达曼地震激发的地球球型自由振荡的检测[J].地震学报,29(4):369-381.
万永革,周公威,郭燕平,等.2004.昆仑山口西地震激发的地球环型振荡[J].防灾减灾工程学报,24(1):1-7.
万永革,周公威,郭燕平.2005.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,25(1):31-40.
万永革.2007.数字信号处理的MATLAB实现[M].北京:地震出版社.
徐晓枫,万永革,王惠琳.2010.由中国CDSN台网检测到的汶川地震所激发的地球球型自由振荡[J].地震,30(1):36-49.
杨跃文,秦嘉政,任佳,等.2010.利用云南水管仪观测资料检测地球自由振荡[J].地震研究,33(2):189-194.
于海英,朱元清,寿海涛.2006.印度洋9.0级大地震激发的地球球型振荡和环型振荡[J].地球物理学进展,21(3):706-716.
Benioff H,Press F,Smith S.1961.Excitation of the free oscillations of the earth by earthquake[J].J Geophys Res,66(2):605-619.
Dahlen F A.1968.The normal modes of a rotating,elliptical earth[J].Geophys J Rastr,16(4):329-367.
Dahlen F A.1969.The normal modes of a rotating,elliptical earth——11near-resonance multiplet coupling[J].Geophys J Rastr,18(4):397-436.
Ness N R,Harrison C T,Slichter L B.1961.Observation of the free oscil-lation of the earth[J].J Geophys Res,66(2):621-629.
Widmer-Schnidrig R.1999.Free oscillations illuminate the mantle[J].Nature,398:292-293.
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