基于HHT提取昆明、下关重力固体潮的地震前兆信息
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摘要
在重力固体潮地震前兆分析中引入HHT时频分析新方法.结合HHT的优越性、固体潮的特点和地震的非平稳过程特性,设计重力固体潮地震前兆分析的瞬时频率特征参数;以相应理论计算值作为参照背景,研究固体潮的震前变化特征.昆明、下关的震例分析表明,的确存在瞬时频率特征参数的震前变化,且具短期、同步正异常特征;瞬时频率特征参数具有明确的物理意义,其震前变化反映了地震非平稳过程对理论重力固体潮的影响.
HHT time-frequency method is introduced in new analysis of gravity tide.Based on superiority of HHT,the character of gravity tide and nonstationary processes of earthquake,we design characteristic parameters of instantaneous frequency of gravity tide.And we refer to corresponding theoretical values of gravity tide in the course of earthquakes analysis.The results of Kunming and Xiaguan show that there are some premonitory changes in the characteristic parameters of instantaneous frequency before earthquakes,which bear short-term and synchronization characters.The characteristic parameters of instantaneous frequency have clear physical significance.These premonitory changes express that the nonstationary processes of earthquake influenced the observation of stationary processes of gravity tide.
HHT time-frequency method is introduced in new analysis of gravity tide.Based on superiority of HHT,the character of gravity tide and nonstationary processes of earthquake,we design characteristic parameters of instantaneous frequency of gravity tide.And we refer to corresponding theoretical values of gravity tide in the course of earthquakes analysis.The results of Kunming and Xiaguan show that there are some premonitory changes in the characteristic parameters of instantaneous frequency before earthquakes,which bear short-term and synchronization characters.The characteristic parameters of instantaneous frequency have clear physical significance.These premonitory changes express that the nonstationary processes of earthquake influenced the observation of stationary processes of gravity tide.
引文
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[8]周挚,山秀明,梁虹等.固体潮时频分析新方法.地震研究,2005,28(4):334～339Zhou Z,Shan X M,Liang H,et al.Anewapproach of earthtides time-frequency analysis.Journal of Seismological Research(in Chinese),2005,28(4):334～339
[9]王珍,马孝江.局域波边界谱在缸盖振动信号分析中应用研究.内燃机工程,2002,23(3):50～53Wang Z,Ma X J.Application and research on vibration signal of diesel engine cylinder cover based on local wave boundary-spectrum.Chinese Internal Combustion Engineering(in Chinese),2002,23(3):50～53
[10]王珍,马孝江.局域波时频法在柴油机缸套活塞磨损诊断中的应用研究.内燃机学报,2002,20(2):157～160Wang Z,Ma XJ.Investigation on diagnosis of diesel engine piston-liner wear faults based on local wave time-frequency approach.Transactions of Csice(in Chinese),2002,20(2):157～160
[11]李宏坤,马孝江.局域波法在船舶柴油机燃油系统故障诊断中应用.大连理工大学学报,2003,43(2):168～171Li H K,Ma X J.Application of local wave method to fuel systemfault diagnosis of marine diesel.Journal of Dalian University of Technology(in Chinese),2003,43(2):168～171
[12]王奉涛,马孝江,邹岩昆等.基于局域波法的时频局部能量特征提取方法.中国机械工程,2003,14(23):2012～2014,2028Wang F T,Ma X J,Zou Y K,et al.A method for feature extraction of local energy in time-frequency domain based on local wave approach.China Mechanical Engineering(in Chinese),2003,14(23):2012～2014,2028
[13]邹岩昆,马孝江,蔡悦等.基于局域波法的柴油机缸套活塞磨损故障诊断.起重运输机械,2004,(2):35～37Zou Y K,Ma X J,Cai Y,et al.Diagnosis to diesel engine piston-liner wear with partial wave method.Hoisting and Conveying Machinery(in Chinese),2004,(2):35～37
[14]程军圣,于德介,杨宇.基于EMD的能量算子解调方法及其在机械故障诊断中的应用.机械工程学报,2004,40(8):115～118Cheng J S,Yu D J,Yang Y.Energy operator demodulating approach based on EMD and its application in mechanical fault diagnosis.Chinese Journal of Mechanical Engineering(in Chinese),2004,40(8):115～118
[15]Ohnaka M,Mogi K.Frequency characteristics and its relation to the fracturing process to failure.J.Geophys.Res.,1982,87(B5):3873～3884
[16]臧绍先,范建利.不同单轴加压方式下岩石声发射的时间过程与频率特征.地震学报,1987,9(1):74～88Zang S X,Fan J L.The acoustic emission and its frequency characteristics in rocks under different types of uniaxial compression.Acta Seismologica Sinica(in Chinese),1987,9(1):74～88
[17]Xu Z Y,Yang R H,Wang B,et al.Burst strain disturbance:a new test study on fracture precursory.Acta Seismologica Sinica,1998,11(6):737～744
[18]潘长良,祝方才,曹平等.单轴压力下岩爆倾向岩石的声发射特征.中南工业大学学报(自然科学版),2001,32(4):336～338Pan C L,Zhu F C,Cao P,et al.Characteristics of acoustic emission of bursting-intended rocks under uniaxial compression.Journal of Central South University of Technology(Natural Science)(in Chinese),2001,32(4):336～338
[19]李世愚,刘建新,和雪松等.地震前低频事件的实验研究.地震地磁观测与研究,2002,23(4):1～7Li S Y,Liu J X,He XS,et al.Experimental investigation of precursory low-frequency events before strong earthquakes.Seismological and Geomagnetic Observation and Research(in Chinese),2002,23(4):1～7
[20]唐林波,李世愚,苏-等.强地震前兆低频波的实验研究.中国地震,2003,19(1):48～57Tang L B,Li S Y,Su F,et al.Experimental study on precursory low-frequency waves of earthquakes.Earthquake Research in China(in Chinese),2003,19(1):48～57
[21]Li S Y,Tang L B,He X S,et al.Experimental research of the low frequency wave that radiated into the air before failure of rock.Earthquake Research in China,2005,19(1):86～96
[22]王赟赟,杨润海,赵晋明等.前驱地震波的试验研究及波谱分析.地震研究,2003,26(1):50～56Wang Y Y,Yang R H,Zhao J M,et al.Experimental study of premonitory seismic wave and spectrumanalysis.Journal of Seismological Research(in Chinese),2003,26(1):50～56
[23]李正光,杨润海,赵晋明等.地震序列类型的岩石破裂实验研究.地震研究,2005,28(4):388～392Li Z G,Yang R H,Zhao J M,et al.Rock-breaking test research on earthquake sequence type.Journal of Seismological Research(in Chinese),2005,28(4):388～392
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[25]陈德福,罗荣祥,刘国培.倾斜异常图像分类及其特征浅析.见:陈德福等主编.地壳形变动力学观测与研究.北京:海洋出版社,1993.174～187Chen D F,Luo R X,Liu G P.Classification of anomalous map of ground tilt and the analysis of its characteristic.In:Chen D F,et al.Geodynamic Observations and Its Studies Based on the Crustal Deformation(in Chinese).Beijing:Ocean Press,1993.174～187
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