乾陵地震台钻孔体应变张性突跳异常分析
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摘要
2012年2—6月乾陵地震台钻孔体应变多次记录到不明原因的大幅张性突跳,采用HHT方法对边际谱特征进行分析,并与山东长清地震台体应变因电源不匹配所产生干扰信号的边际谱特征进行对比。结果表明,二者具有较好的相关性。据此推断,造成此次应变异常的主要原因是电源问题。
The unusually extensional strain steps with large amplitudes were repeatedly recorded by dilatometer at Qianling Seismic Station from February 2012 to June 2012.The HilbertHuang transform(HHT) is used to obtain the characteristics of Hilbert marginal spectra of these strain anomalies.Then,we further compared the analytical result to the Hilbert marginal spectra of the disturbed strain changes induced by power mismatching recorded at Changqing Seismic Station.Analytical results generally show that their characteristics of Hilbert marginal spectra have a good agreement.This suggests that the strain anomaly observed at Qianling Seismic Station was principally caused by power problem.
The unusually extensional strain steps with large amplitudes were repeatedly recorded by dilatometer at Qianling Seismic Station from February 2012 to June 2012.The HilbertHuang transform(HHT) is used to obtain the characteristics of Hilbert marginal spectra of these strain anomalies.Then,we further compared the analytical result to the Hilbert marginal spectra of the disturbed strain changes induced by power mismatching recorded at Changqing Seismic Station.Analytical results generally show that their characteristics of Hilbert marginal spectra have a good agreement.This suggests that the strain anomaly observed at Qianling Seismic Station was principally caused by power problem.
引文
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池顺良,刘琦,池毅,等.2013年芦山M_S 7.0地震的震前及临震应变异常[J].地震学报,2013,3 5(3):296—303.
公茂盛,谢礼立.HHT方法在地震工程中的应用之初步探讨[J].世界地震工程,2003,19(3):39—43.
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陈启林,朱海林,王皓,等.溧阳台体应变干扰的查找与排除[J].华南地震,2004,24(1):74—78.
池顺良,刘琦,池毅,等.2013年芦山M_S 7.0地震的震前及临震应变异常[J].地震学报,2013,3 5(3):296—303.
公茂盛,谢礼立.HHT方法在地震工程中的应用之初步探讨[J].世界地震工程,2003,19(3):39—43.
郝军丽,卢双苓,于庆民,等.长清地震台体应变观测干扰识别分析[J].华北地震科学,2012,30(1):59—64.
李罡风,姜薇薇,陶媛,等.蚌埠钻孔应变受抽水干扰的分析[J].西北地震学报,2011,33(B8):456—460.
卢双苓,于庆民,曲保安,等.山东数字化钻孔体应变观测的干扰异常分析[J].西北地震学报,2010a,32(2):186—190.
卢双苓,于庆民,王强,等.泰安地震台应变观测受到抽水干扰的初步分析[J].华北地震科学,2010b,28(3):43—47.
马栋,牛安福,袁淑芳,等.据频谱特征分析短时气压波动对体应变的影响[J].内陆地震,2011,25(3):255—262.
邱泽华,张宝红,池顺良,等.汶川地震前姑咱台观测的异常应变变化[J].中国科学:地球科学,2010,40(8):1 031—1 039.
邱泽华,唐磊,张宝红,等.用小波-超限率分析提取宁陕台汶川地震体应变异常[J].地球物理学报,2012,55(2):538—546
苏恺之,张钧,李秀环,等.钻孔环境在钻孔地形变观测中的作用[J].地震地磁观测与研究,2005,26(6):46—55.
王梅,曲同磊,孔向阳.数字化体应变仪观测值突跳的分析[J].地震,2002,22(1):111—114.
徐斌,徐德城,朱卫平,等.希尔伯特-黄变换方法的改进[J].西北工业大学学报,2011,29(2):268—272.
张凌空,牛安福.不同周期气压波对钻孔体应变仪观测结果的影响[J].中国地震,2008,24(4):415—421.
周挚,山秀明,张立,等.基于HHT提取昆明、下关重力固体潮的地震前兆信息[J].地球物理学报,2008,51(3):836—844.
朱航,邓建平,阳光.关于汶川8.0级地震前两项异常真伪的探讨[J].四川地震,2010,33(1):13—17.
Bernard P,Lyon-Caen H,Briole P et al.Seismicity,deformation and seismic hazard in the western rift of Corinth,New insights from the Corinth Rift Laboratory(CRL)[J].Tectonophysics,2006,426(1),7—30.
Borcherdt R D,Johnston M J S.Glassmoyer G et al.Recordings of the 2004 Parkfield earthquake on the General Earthquake Observation System array,Implications for earthquake precursors,fault rupture,and coseismic strain changes[J].Bull Seismol Soc Am,2006,96(4B),S73-S89.
Chen C H,Wang C H,Wen S et al.Anomalous frequency characteristics of groundwater level before major earthquakes in Taiwan[J].Hydrol Earth Syst Sci,2013,17(5),1 693-1 703.
Huang N E,Shen Z,Long S R et al.The empirical mode decomposition and the Hilbert spectrum for nonlinear and non-stationary time series analysis[J].Proc R Soc Lond A,1998,454(1971),903—995.
Huang N E,Wu Z.A review on Hilbert-Huang transform,Method and its applications to geophysical studies[jj.Rev Geophys,2008,46(2),RG2006.
Itaba S,Koizumi N,Matsumoto N et al.Continuous observation of groundwater and crustal deformation for forecasting Tonankai and Nankai earthquakes in Japan[J],Pure Appl Geophys,2010,167,1 105—1 114.
Johnston M J S,Borcherdt R D,Linde A T et al.Continuous borehole strain and pore pressure in the near field of the 28 September 2004 M6.0 Parkfield,California,earthquake,Implications for nucleation,fault response,earthquake prediction,and tremor[J].Bull Seismol Soc Am,2006,96(4B),S56-S72.
Linde A T.Gladwin M T,Johnston M J et al.A slow earthquake sequence on the San Andreas fault[J].Nature,1996,383(6595):65-68.
Liu C C,Linde A T,Sacks I S.Slow earthquakes triggered by typhoons[J].Nature,2009,459(7248),833—836.
Nikolaidis R.Observation of geodetic and seismic deformation with the Global Positioning System[M].PhD Thesis,Univ Calif ornia,San Diego,2002:1—2.
Orihara Y,Kamogawa M,Nagao T et al.Variations of geoelectric potential differences associated with an anomalous volumetric strain change in the region of expected Tokai Earthquake,Japan[J].Nat Hazards Earth Syst Sci,2012,12,121—127.
Vanboskirk E J,Gottlieb M H,Hodgkinson K M et al.2011 creep event observations in borehole strainmeter instrumentation along the San Andreas and San Jacinto faults[C].AGU Fall Meeting,San Francisco,California,5—9 December,2011,T13A-2348.
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