1986: CHANGES IN TRANSFER FUNCTION BEFORE AND AFTER THE 1979 LI YANG JIANG SU, EARTHQUAKE. Acta Seismologica Sinica, 8(4): 412-420.
Citation: 1986: CHANGES IN TRANSFER FUNCTION BEFORE AND AFTER THE 1979 LI YANG JIANG SU, EARTHQUAKE. Acta Seismologica Sinica, 8(4): 412-420.

CHANGES IN TRANSFER FUNCTION BEFORE AND AFTER THE 1979 LI YANG JIANG SU, EARTHQUAKE

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  • Published Date: August 31, 2011
  • Geomagnetic variations over three period bands 17-28, 28-41 and 43-80 min. extracted from two magnetic storms, one April 25 and the other on August 13, 1979, occurring before and after the July 9, 1979 Li Yang M6.0 earthquake, have been analysed with a special method for non-stable storm fieid. From these short period variations the maximum principal axes of induction Tu over each period band have been calculated for each station (△u| and ir direction , before and after the earthquake.The changes in |Tu| reached the greatest value (0.190) at Li Yang station (△ = 25km) and Changes in being greatest (31) at Chang Shu station (△ = 145 km). The changes in Tu at each station can be reasonably interpreted by association with the earthquake if they are put upon the local geological setting. In addition, like |Tu|, the variation in would also serve as a probable precursor prior to an intermediate-strong earthquake.
  • [1] 力武常次, 地球磁场とその逆转, サイエンス社, 1980.

    [2] YanaKihara, K., Secular variation of the electrical conductivity anomaly in the central part of Japan, b1cm. Kakioka Mag. Obs., 15, 1——11, 1972.

    [3] Yanagihara, K. and T. Nagano, Time change of transfer function in the Central Japan anomaly of couductivity with special reference to earthquake occurrences, J. Geomagn. Gcoelec., 28, 157——163, 1976.

    [4] Tsuneji Rikitake, Changes in the direction of magnetic vector of short period geomagnetic variations before the 1972 Sitka, Alaska, earthquake, J. Geomagn. Geoelec., 31, 441——448, 1979.

    [5] Chen P. F., A search for correlation between time change in transfer functions and seismic activity in north Taiwan. J. Geomagn. Geoelec., 33, 635——643, 1931.

    [6] Woods, D .V. and F. E. M. Lilley, Geomagnetic induction in Central .lustralia, J. Geomagn. Geoelee., 31. 449——458, 1979.

    [7] Klsin, D. R., J. C. Larson, Magnetic induction field (2——3cpd) on H.nwaii island and their implications regarding electrical conductivity in the oceanic mantle, Geophys. J. R, astr. Soc. 53, 61——77, 1978.

    [8] 严大华, 局部地区电导率异常的地磁检测, 地震学刊, 1981, 1: 44——48,

    [9] Shiraki, M., Monitoring of the time Change in transfer functions in the Central Japan Conductivity anomaly. J. Geomagn. Geoelec., 32, 637——648, 1980.

    [10] Banks, R. J., Complex demodulation of geomagnetic data and the estimation of transfer functions. Geophys. J. R. astr, Soc. 43, 87——101, 1975.

    [11] Gough, D. I. J. H. de Beer, Source——field bias in geomagnetic transfer functions: A case history. J. Geomagn. Ceoelee. 32, 8, 1980.

    [12] 谢瑞征、陈晓明、李端璐, 傈阳六级地震的发震构造, 地震科学研究, 1981 , 4: 39——45.

    [13] 孙寿成, 秦承昌, 傈阳地震的烈度, 地震战线, 1980, 1: 1——3.

    [14] 刘万琴、黄家正, 用瑞雷波广义方向性函数研究5——6级地震的破裂过程, 地震学报, 4, 27——33, 1982.

    [15] 叶洪、张文郁、于之水、夏勤1979年深阳六级地震震源构造的研究, 地震地质, 2, 27——37, 1980.

    [16] 贺楚儒、彭纯一、张四维, 傈阳六级地震的震磁效应观测, 地震学刊, 1982, 2: 1——9.

    [1] 力武常次, 地球磁场とその逆转, サイエンス社, 1980.

    [2] YanaKihara, K., Secular variation of the electrical conductivity anomaly in the central part of Japan, b1cm. Kakioka Mag. Obs., 15, 1——11, 1972.

    [3] Yanagihara, K. and T. Nagano, Time change of transfer function in the Central Japan anomaly of couductivity with special reference to earthquake occurrences, J. Geomagn. Gcoelec., 28, 157——163, 1976.

    [4] Tsuneji Rikitake, Changes in the direction of magnetic vector of short period geomagnetic variations before the 1972 Sitka, Alaska, earthquake, J. Geomagn. Geoelec., 31, 441——448, 1979.

    [5] Chen P. F., A search for correlation between time change in transfer functions and seismic activity in north Taiwan. J. Geomagn. Geoelec., 33, 635——643, 1931.

    [6] Woods, D .V. and F. E. M. Lilley, Geomagnetic induction in Central .lustralia, J. Geomagn. Geoelee., 31. 449——458, 1979.

    [7] Klsin, D. R., J. C. Larson, Magnetic induction field (2——3cpd) on H.nwaii island and their implications regarding electrical conductivity in the oceanic mantle, Geophys. J. R, astr. Soc. 53, 61——77, 1978.

    [8] 严大华, 局部地区电导率异常的地磁检测, 地震学刊, 1981, 1: 44——48,

    [9] Shiraki, M., Monitoring of the time Change in transfer functions in the Central Japan Conductivity anomaly. J. Geomagn. Geoelec., 32, 637——648, 1980.

    [10] Banks, R. J., Complex demodulation of geomagnetic data and the estimation of transfer functions. Geophys. J. R. astr, Soc. 43, 87——101, 1975.

    [11] Gough, D. I. J. H. de Beer, Source——field bias in geomagnetic transfer functions: A case history. J. Geomagn. Ceoelee. 32, 8, 1980.

    [12] 谢瑞征、陈晓明、李端璐, 傈阳六级地震的发震构造, 地震科学研究, 1981 , 4: 39——45.

    [13] 孙寿成, 秦承昌, 傈阳地震的烈度, 地震战线, 1980, 1: 1——3.

    [14] 刘万琴、黄家正, 用瑞雷波广义方向性函数研究5——6级地震的破裂过程, 地震学报, 4, 27——33, 1982.

    [15] 叶洪、张文郁、于之水、夏勤1979年深阳六级地震震源构造的研究, 地震地质, 2, 27——37, 1980.

    [16] 贺楚儒、彭纯一、张四维, 傈阳六级地震的震磁效应观测, 地震学刊, 1982, 2: 1——9.
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