利用张家口地震台体应变观测资料检测地球自由振荡
|
摘要
在保证低频自由振荡信号分辨率,又不对高频自由振荡信号产生抑制效应的前提下,利用张家口地震台体应变观测资料,采用功率谱密度估计方法,获得2011年3月11日日本9.0级大地震激发的_0S_2—_0S_(74)基频球型振荡和17个谐频球型振荡(_3S_2、_5S_3、_2S_(10)、_2S_(12)、_3S_9、_(11)S_1、_7S_(10)、_5S_(13)、_4S_(18)、_5S_(14)、_(14)S_4、_4S_(24)、_1S_(38)、_7S_(18)、_(14)S_8、_9S_(19)、_5S_(30)),并与地球初步参考模型(PREM)的理论自由振荡周期进行对比,发现与实测振荡周期基本一致。
Under the conditions of ensuring the resolution ratio of low frequency free oscillation signals and no inhibiting effect on high frequency free oscillation signals, we acquired _0S_2—_0S_(74) fundamental sphere free oscillations and 17 harmonic sphere free oscillations _3S_2、_5S_3、_2S_(10)、_2S_(12)、_3S_9、_(11)S_1、_7S_(10)、_5S_(13)、_4S_(18)、_5S_(14)、_(14)S_4、_4S_(24)、_1S_(38)、_7S_(18)、_(14)S_8、_9S_(19)、_5S_(30) caused by the March 11,2011 Japan earthquake using the digital observation data of the strain meter at Zhangjiakou Seismic Station by power spectrum density estimation method. Compared it with the periods of free oscillations of the PREM model, it is found that the measured oscillation period is basically coincide with the oscillation period predicted by the PREM model.
Under the conditions of ensuring the resolution ratio of low frequency free oscillation signals and no inhibiting effect on high frequency free oscillation signals, we acquired _0S_2—_0S_(74) fundamental sphere free oscillations and 17 harmonic sphere free oscillations _3S_2、_5S_3、_2S_(10)、_2S_(12)、_3S_9、_(11)S_1、_7S_(10)、_5S_(13)、_4S_(18)、_5S_(14)、_(14)S_4、_4S_(24)、_1S_(38)、_7S_(18)、_(14)S_8、_9S_(19)、_5S_(30) caused by the March 11,2011 Japan earthquake using the digital observation data of the strain meter at Zhangjiakou Seismic Station by power spectrum density estimation method. Compared it with the periods of free oscillations of the PREM model, it is found that the measured oscillation period is basically coincide with the oscillation period predicted by the PREM model.
引文
池海江,朱振兴,王锐锋,等.张家口台印尼苏门答腊大地震钻孔应变观测报告[J].地壳构造与地壳应力,2005,(2):4-8.
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):1 432-1 436.
孟方杰,张燕,赵佳佳.利用全台网垂直摆倾斜仪数据检测日本MW 9.0地震激发的低频自由振荡[J].大地测量与地球动力学,2018,38(6):650-654.
邱泽华,马瑾,池顺良,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.
任佳,陈华静,蒋翠荣,等.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,2009,32(4):333-338.
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.
万永革,盛书中,周公威,等.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,2007,29(4):369-381.
万永革.数字信号处理的MATLAB实现[M].北京:科学出版社,2007.
Benioff H,Press F,Smith S.Excitation of the free oscillations of the Earth by earthquakes[J].J Geophys Res,1961,66(2):605-619.
Beroza G C,Jordan T H.Searching for slow and silent earthquakes using free oscillations[J].J Geophys Res,1990,95(B3):2 485-2 510.
Dziewonski A M,Anderson D L.Preliminary reference earth model[J].Phys Earth Planet Inter,1981,25(4):297-356.
Ness N R,Harrison C T,Slichter L B.Observations of the free oscillations of the earth[J].J Geophys Res,1961,66(2):621-629.
Park J,Song T R A,Tromp J,et al.Earth’s free oscillations excited by the 26 December 2004 Sumatra-Andaman earthquake[J].Science,2005,308(5 725):1 139-1 144.
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):1 432-1 436.
孟方杰,张燕,赵佳佳.利用全台网垂直摆倾斜仪数据检测日本MW 9.0地震激发的低频自由振荡[J].大地测量与地球动力学,2018,38(6):650-654.
邱泽华,马瑾,池顺良,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.
任佳,陈华静,蒋翠荣,等.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,2009,32(4):333-338.
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.
万永革,盛书中,周公威,等.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,2007,29(4):369-381.
万永革.数字信号处理的MATLAB实现[M].北京:科学出版社,2007.
Benioff H,Press F,Smith S.Excitation of the free oscillations of the Earth by earthquakes[J].J Geophys Res,1961,66(2):605-619.
Beroza G C,Jordan T H.Searching for slow and silent earthquakes using free oscillations[J].J Geophys Res,1990,95(B3):2 485-2 510.
Dziewonski A M,Anderson D L.Preliminary reference earth model[J].Phys Earth Planet Inter,1981,25(4):297-356.
Ness N R,Harrison C T,Slichter L B.Observations of the free oscillations of the earth[J].J Geophys Res,1961,66(2):621-629.
Park J,Song T R A,Tromp J,et al.Earth’s free oscillations excited by the 26 December 2004 Sumatra-Andaman earthquake[J].Science,2005,308(5 725):1 139-1 144.