利用怀来地震台水管仪观测资料检测地球自由振荡
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摘要
利用怀来地震台水管仪的数字化观测资料,采用功率谱密度估计方法,在没有对资料去固体潮处理的情况下,准确获得2004年12月26日苏门答腊9.0级地震激发的_0S_2—_0S_(38)基频球型自由振荡,并与PREM模型的理论自由振荡周期进行对比,发现实测振荡周期与PREM预测的振荡周期吻合,除_0S_2、_0S_4、_0S_7振型的观测周期和PREM模型理论周期的相对误差大于0.3%外,其他振型的观测周期和PREM模型理论周期的相对误差大都集中在0.1%左右,同时检测到7个谐频球型振荡和10个环型振荡。可以从水管倾斜仪的观测资料中提取地球球型振荡信息,为地球自由振荡的研究提供一种新的仪器观测方法。
In this research,without dealing with the case of solid tide,we successfully detected _0S_2— _0S_(38) free ball-oscillation excited by Sumatra earthquake on December 26,2004 in the use of observational data of the digital water-pipe meter in Huailai Seismic Station,with power spectral density estimation methods.Comparing with the free-running period of PREM model theory,we found that,except for the relative value between the period of _0S_2、_0S_4、_0S_7 and the PREM prediction is greater than 0.3%,the value regarding the vibration mode of the observation period and the PREM model were mainly focused on the relative error of about 0.1%.Also,we detected seven harmonic oscillation and 10 ring oscillation.In the use of observed data from water-pipe instrument to extract information of Earth oscillation,provide a new instrument method of observation for the study of the Earth's free oscillations.
In this research,without dealing with the case of solid tide,we successfully detected _0S_2— _0S_(38) free ball-oscillation excited by Sumatra earthquake on December 26,2004 in the use of observational data of the digital water-pipe meter in Huailai Seismic Station,with power spectral density estimation methods.Comparing with the free-running period of PREM model theory,we found that,except for the relative value between the period of _0S_2、_0S_4、_0S_7 and the PREM prediction is greater than 0.3%,the value regarding the vibration mode of the observation period and the PREM model were mainly focused on the relative error of about 0.1%.Also,we detected seven harmonic oscillation and 10 ring oscillation.In the use of observed data from water-pipe instrument to extract information of Earth oscillation,provide a new instrument method of observation for the study of the Earth's free oscillations.
引文
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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．
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万永革,盛书中,周公威.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．
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Alsop L E,Sutton G H and Ewing M. Free oscillation of Earth observed on strain and pendulum seismographs[J]. Geophy Res,1961,66(2) :631-641．
Benioff H,Press F and Smith S. Excitation of the free oscillations of the Earth by earthquakes[J]. Geophys Res, 1961, 66(2) :605-619．
Beroza G C and Jordan T H. Searching for slow and silent earthquakes using free oscillations[J]. Geophys Res, 1990, 95(B3) :2485-2510．
Bogert B P. An observation of free oscillations of the Earth[J]. Geophys Res, 1961,66 (2) :643-646．
Bolt B A and Currie R G. Maximum entropy estimates of Earth torsional eigenperiods from 1960 trieste data[J]. Geophys J R Astr Soc,1975,40:107-114．
Dziewonski A M and Gillbert F. Observation of normal modes from 84 recordings of the Alaskan earthquakes of 1964 March 28[J]. GeophysJ RAstrSoc,1972,27:393-446．
Lamb H. On the variations of an elastic sphere[J]. Lond Math Soc Proc,1882,13:233-256．
Ness N R, Harrison C T and Sliehter L B. Observation of the free oscillation of the earth[J]. Geophys Res, 1961,66: 621-629．
Nishida K and Kobayashi N. Statistical features of Earth's continuous free Geophys oscillations[J]. Geophys Res, 1999, (104) :28741-28750．
Park J,Song T A and Tromp Jet al. Earth's free oscillations excited by the 26 December, 2004 Sumatra Andaman earthquake[J]. Science,2005,308:1139-1146．
Stein S and Okal E A. Speed and size of the Sumatra earthquake[J]. Nature,2005a,434:581-582．
Stein S and Okal E A. The 2004 Sumatra earthquake and India ocean t sunami:What happened and why[J]. The Earth's Sci entist,2005b,XXXI(2) :6-11．
Tanimota T and Um J. Cause of continuous oscillations of the earth[J]. Geophys Res, 1999, (104) :28723-28740．
Tanimsota T, Um J and Nishida Ket al. Earth's continuous oscillations observed on seismically quiet days[J]. Geophys Res Lett,1998,(25) :1553-1556．
Zadro M and Braitenberg C. Measurements and interpretations of tiltstrain gauges in seismically active areas[J]. Earth Sci ence Reviews,1999,47:151-187．
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．
任佳,陈华静,王松,等.汶川大地震激发的地球球型自由振荡[J].中国地震,2009,25(1) :73-80．
宋秀青,于海英.印度洋9． 0级大地震激发的基频地球球型振荡[J].地震地磁观测与研究,2005,26(4) :13-17．
万永革,盛书中,周公威.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,2007:252-279．
Alsop L E,Sutton G H and Ewing M. Free oscillation of Earth observed on strain and pendulum seismographs[J]. Geophy Res,1961,66(2) :631-641．
Benioff H,Press F and Smith S. Excitation of the free oscillations of the Earth by earthquakes[J]. Geophys Res, 1961, 66(2) :605-619．
Beroza G C and Jordan T H. Searching for slow and silent earthquakes using free oscillations[J]. Geophys Res, 1990, 95(B3) :2485-2510．
Bogert B P. An observation of free oscillations of the Earth[J]. Geophys Res, 1961,66 (2) :643-646．
Bolt B A and Currie R G. Maximum entropy estimates of Earth torsional eigenperiods from 1960 trieste data[J]. Geophys J R Astr Soc,1975,40:107-114．
Dziewonski A M and Gillbert F. Observation of normal modes from 84 recordings of the Alaskan earthquakes of 1964 March 28[J]. GeophysJ RAstrSoc,1972,27:393-446．
Lamb H. On the variations of an elastic sphere[J]. Lond Math Soc Proc,1882,13:233-256．
Ness N R, Harrison C T and Sliehter L B. Observation of the free oscillation of the earth[J]. Geophys Res, 1961,66: 621-629．
Nishida K and Kobayashi N. Statistical features of Earth's continuous free Geophys oscillations[J]. Geophys Res, 1999, (104) :28741-28750．
Park J,Song T A and Tromp Jet al. Earth's free oscillations excited by the 26 December, 2004 Sumatra Andaman earthquake[J]. Science,2005,308:1139-1146．
Stein S and Okal E A. Speed and size of the Sumatra earthquake[J]. Nature,2005a,434:581-582．
Stein S and Okal E A. The 2004 Sumatra earthquake and India ocean t sunami:What happened and why[J]. The Earth's Sci entist,2005b,XXXI(2) :6-11．
Tanimota T and Um J. Cause of continuous oscillations of the earth[J]. Geophys Res, 1999, (104) :28723-28740．
Tanimsota T, Um J and Nishida Ket al. Earth's continuous oscillations observed on seismically quiet days[J]. Geophys Res Lett,1998,(25) :1553-1556．
Zadro M and Braitenberg C. Measurements and interpretations of tiltstrain gauges in seismically active areas[J]. Earth Sci ence Reviews,1999,47:151-187．
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