黑龙江省延寿地震台竖直摆倾斜仪潮汐短临变化特征
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摘要
选择黑龙江省延寿地震台CZB-1型竖直摆倾斜仪2005年的固体潮观测资料,提取了2005年7月25日黑龙江省林甸M5.1和9月19日内蒙古牙克石M4.7地震前,倾斜固体潮半日波(M2)的潮汐因子γ及相位滞后因子Δφ等参量,综合分析了中强地震前区域倾斜形变潮汐的短临变化特征。认为:1)对潮汐频段参数潮汐因子、相位滞后因子异常信息进行提取,有利于捕捉地震前兆异常。2)潮汐因子的变化特征从时间上给出了震源的短临前兆信息。从图形变化看,这种变化过程可归纳为趋势性背景变化→增大(或减小)→极值→恢复→等待→发震。3)固体潮调和分析方法具有较强的抗干扰能力,图形变化稳定、异常突出明显。
An analysis has been made of the 2005 earth tide observation data recorded by the CZB-1 type perpendicular pendulum tiltmeter at the Yanshou Seismic Station of Heilongjiang,using the two day(48h)and two-day sliding monthly harmonic analysis method.Values of the tidal factor γ and the phase-delay factor Δφ before the Jul 25th,2005 MS 5.1 Lindian,Heilongjiang and the Sept 19th 2005 MS 4.7 Yakeshi,Inner Mongolia earthquakes have been determined for the semidiurnal constituent(M2)of the tilt earth tides.As a result,some features of deformation of tide variations prior to some moderate earthquakes have been revealed.Relation expression was preliminarily calculated between the waiting time after anomaly or anomaly amplitude or epicentral distance and earthquake magnitude.Results of comprehensive analysis are as follows:(1)The tidal factor reflects the elastic stage of earth crust media response to tidal force in physical meaning.The earth crust media state varies and the earth crust deformation turns into an instable phase along with stress strengthening before moderate-strong earthquake.Adopting the harmonic analysis method and with a proper calculation length,the anomaly information of the tidal factor and the phase-delay factor are extracted for better analyzing and calculating the stress-strain state of earth crust media against the time series,giving prominence to the short-impending anomaly information,and catching the precursor anomaly of earthquake occurrence.(2)Tidal factor variations reflect the stress change in earth crust media of seismic source area,which offers the short-impending precursor information relating to time.The variation process can be summarized as trend background → augmentation or contraction → extreme → restitution → waiting → earthquake occurrence.(3)The harmonic analysis method of tide has high anti-interference ability.It can remove the interferences,such as the long-term trend drift and environmental effect,to provide stable figures and give prominence to the anomaly information.In addition,the Venedikov harmonic analysis method is a valid method for studying the relationship between the tidal tilt anomalies and the moderately strong earthquake.
An analysis has been made of the 2005 earth tide observation data recorded by the CZB-1 type perpendicular pendulum tiltmeter at the Yanshou Seismic Station of Heilongjiang,using the two day(48h)and two-day sliding monthly harmonic analysis method.Values of the tidal factor γ and the phase-delay factor Δφ before the Jul 25th,2005 MS 5.1 Lindian,Heilongjiang and the Sept 19th 2005 MS 4.7 Yakeshi,Inner Mongolia earthquakes have been determined for the semidiurnal constituent(M2)of the tilt earth tides.As a result,some features of deformation of tide variations prior to some moderate earthquakes have been revealed.Relation expression was preliminarily calculated between the waiting time after anomaly or anomaly amplitude or epicentral distance and earthquake magnitude.Results of comprehensive analysis are as follows:(1)The tidal factor reflects the elastic stage of earth crust media response to tidal force in physical meaning.The earth crust media state varies and the earth crust deformation turns into an instable phase along with stress strengthening before moderate-strong earthquake.Adopting the harmonic analysis method and with a proper calculation length,the anomaly information of the tidal factor and the phase-delay factor are extracted for better analyzing and calculating the stress-strain state of earth crust media against the time series,giving prominence to the short-impending anomaly information,and catching the precursor anomaly of earthquake occurrence.(2)Tidal factor variations reflect the stress change in earth crust media of seismic source area,which offers the short-impending precursor information relating to time.The variation process can be summarized as trend background → augmentation or contraction → extreme → restitution → waiting → earthquake occurrence.(3)The harmonic analysis method of tide has high anti-interference ability.It can remove the interferences,such as the long-term trend drift and environmental effect,to provide stable figures and give prominence to the anomaly information.In addition,the Venedikov harmonic analysis method is a valid method for studying the relationship between the tidal tilt anomalies and the moderately strong earthquake.
引文
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罗灼礼.1980.震源应力场、形变场和倾斜场[J].地震学报,2(2):169—184.LUO Zhuo-li.1980.Stress field,deformation field and tilt field of hypocenter[J].Acta Seismologica Sinica,2(2):169—184(in Chinese).
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唐九安.1981.固体潮观测数据的预处理[J].西北地震学报,3(3):73—77.TANG Jiu-an.1981.Pre-processing method of observational data of earth tide[J].Northwestern Seismological Jour-nal,3(3):73—77(in Chinese).
王梅,宋治平,李峰,等.2004.由泰安地震台形变资料看固体潮数字化观测运行[J].地震研究,27(1):49—56.WANG Mei,SONG Zhi-ping,LI Feng,et al.2004.Estimating operational state of the digitized earth tide observationaccording to deformation data observed by Tai an Seismic Station[J].Journal of Seismological Research,27(1):49—56(in Chinese).
张晶,张立.2003.中强震前形变固体潮汐资料短期信息的提取[J].地震,23(3):71—78.ZHANG Jing,ZHANG Li.2003.Short-term anomaly extracted from tidal deformation data before moderately strongearthquakes[J].Earthquake,23(3):71—78(in Chinese).
中国地震局监测预报司.2004.强地震短期前兆异常的物理解释[M].北京:地震出版社.38—41.Department of Earthquake Monitoring and Prediction,China Earthquake Administration.2004.Physical Interpretation ofShort-term Precursor Anomaly of Macroseism[M].Seismological Press,Beijing.38—41(in Chinese).
Beaumout C,Berger J.1974.Modification of the earth tide tilts and strains by dilatancy[J].Geoiphys J,39.
国家地震局科技监测司.1995.地震地形变观测技术[M].北京:地震出版社.3—10.Department of Science,Technology and Monitoring,SSB.1995.Observational Technology of Seismo-crustal Deforma-tion[M].Seismological Press,Beijing.3—10(in Chinese).
黑龙江省地质矿产局.1993.黑龙江省区域地质志[M].北京:地质出版社.509—578.Bureau of Geology and Mineral Resources of Heilongjiang Province.1993.Regional Geology of Heilongjiang Province[M].Geological Publishing House,Beijing.509—578(in Chinese).
陆远忠,李胜乐,邓志辉,等.2002.基于GIS的地震分析预报系统[M].成都:成都地图出版社.3—97.LU Yuan-zhong,LI Sheng-le,DENG Zhi-hui,et al.2002.The GIS-based Earthquake Analysis and Prediction System[M].Chengdu Map Publishing House,Chengdu:3—97(in Chinese).
罗灼礼.1980.震源应力场、形变场和倾斜场[J].地震学报,2(2):169—184.LUO Zhuo-li.1980.Stress field,deformation field and tilt field of hypocenter[J].Acta Seismologica Sinica,2(2):169—184(in Chinese).
乔子云,陈建国.2001.应变固体潮NaKai拟合检验及潮汐变化的映震效果[J].地震,21(3):85—90.QIAO Zi-yun,CHEN Jian-guo.2001.The earthquake-reflecting effect of NaKai fitting and tidal analysis of earth straintide data[J].Earthquake,21(3):85—90(in Chinese).
唐九安.1981.固体潮观测数据的预处理[J].西北地震学报,3(3):73—77.TANG Jiu-an.1981.Pre-processing method of observational data of earth tide[J].Northwestern Seismological Jour-nal,3(3):73—77(in Chinese).
王梅,宋治平,李峰,等.2004.由泰安地震台形变资料看固体潮数字化观测运行[J].地震研究,27(1):49—56.WANG Mei,SONG Zhi-ping,LI Feng,et al.2004.Estimating operational state of the digitized earth tide observationaccording to deformation data observed by Tai an Seismic Station[J].Journal of Seismological Research,27(1):49—56(in Chinese).
张晶,张立.2003.中强震前形变固体潮汐资料短期信息的提取[J].地震,23(3):71—78.ZHANG Jing,ZHANG Li.2003.Short-term anomaly extracted from tidal deformation data before moderately strongearthquakes[J].Earthquake,23(3):71—78(in Chinese).
中国地震局监测预报司.2004.强地震短期前兆异常的物理解释[M].北京:地震出版社.38—41.Department of Earthquake Monitoring and Prediction,China Earthquake Administration.2004.Physical Interpretation ofShort-term Precursor Anomaly of Macroseism[M].Seismological Press,Beijing.38—41(in Chinese).
Beaumout C,Berger J.1974.Modification of the earth tide tilts and strains by dilatancy[J].Geoiphys J,39.
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