中国东南部地幔高导层的埋藏深度
BURIED DEPTH OF THE HIGH CONDUCTIVITY LAYER BENEATH THE REGION OF SOUTH-EAST CHINA
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摘要: 本文用武汉、佘山、广州、(山仑)坪四台的地磁日变化资料推断中国东南部下面地幔高导层的埋藏深度。研究方法是一维模型的磁场梯度法。结果:高导层的埋藏深度约为315km,高导层的电阻率约为9m。由于台站数量太少,结果的可靠性可能会受到一定影响。但这个埋藏深度与力武常茨[1]或行武毅[2]根据全球资料得出的平均高导层深度350km很接近。Abstract: The spatial gradient method was used in estimating the buried depth of high conductivity layer beneath the region of south-east China. Quiet daily magnetic variations recorded at four observatories, Wuhan, Zo-Se (Sheshan), Guangzhou and Lun-ping, were analysed in this study. The results indicate that beneath this region the buried depth of high conductivity layer in the mantle is 315 km, and its resistivity 9 m; the reliability of these data may be limited by the small number of observation points available. However, the depth of 315 km is basically consistent with that obtained from global analyses (see the article of Rikitake[1] or Yukutake[2]).
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[1] Rikitake, T., Electromagnetism and the Earth's Interior, Elesevier, Amsterdam, 225, 1966.
[2] Yukutake, T., Attenuation of geomagnetic secular variation through the conducting mantle or the earth, Bull. Earthq. Res. Inst., Tokyo Univ., 37, 13——32, 1959.
[3] Berdichevsky, M. N., L. L. Van'Yan and E. B. Fainberg, Magnetic variation sounding using the spa——ce derivatives of the field, Geomagn. Aeron—— (Erag. Trans.) 9, 299——301, 1969.
[4] Schmucker, U., Anomalies of gcbmagnetic variations in the southwestern United States, Basll. Scrrpps Inst. Oceanogr., Univ. of California, 13, 1970.
[5] Woods, D. V, and F. E. M. Lilley, Geomagnetic induction in centrai Australia, J. Geomagn. Geoelec., 31, 449——458, 1979.
[6] Lilley, F. E. M., D. V. Woods and M. N. Sloane, Electrical conductivity from Australian magneto——meter arrays using spatial gradient data, Phys. Earth Planet. Int., Z5, 202——209, 1981.
[7] Alabi, A. O., Magnetometer array studies, Geophys. Surv., 6, 153——172, 1983.
[8] Price, A. T., The theory of the magnetoteiiuric method when the source field is considered, J. Geophys. Res., 67, 1907——1918, 1962.
[9] 陈伯舫,对"磁暴短周期感应场和佘山地区地慢电导率"一文的讨论,地球物理学报,26, 295——298, 1983.
[10] Lilley, F. E. M., Running waves and standing ovaves in geomagnetic depth sounding, J. Geopsagn. Geoelec., 27, 491——504, 1975.[1] Rikitake, T., Electromagnetism and the Earth's Interior, Elesevier, Amsterdam, 225, 1966.
[2] Yukutake, T., Attenuation of geomagnetic secular variation through the conducting mantle or the earth, Bull. Earthq. Res. Inst., Tokyo Univ., 37, 13——32, 1959.
[3] Berdichevsky, M. N., L. L. Van'Yan and E. B. Fainberg, Magnetic variation sounding using the spa——ce derivatives of the field, Geomagn. Aeron—— (Erag. Trans.) 9, 299——301, 1969.
[4] Schmucker, U., Anomalies of gcbmagnetic variations in the southwestern United States, Basll. Scrrpps Inst. Oceanogr., Univ. of California, 13, 1970.
[5] Woods, D. V, and F. E. M. Lilley, Geomagnetic induction in centrai Australia, J. Geomagn. Geoelec., 31, 449——458, 1979.
[6] Lilley, F. E. M., D. V. Woods and M. N. Sloane, Electrical conductivity from Australian magneto——meter arrays using spatial gradient data, Phys. Earth Planet. Int., Z5, 202——209, 1981.
[7] Alabi, A. O., Magnetometer array studies, Geophys. Surv., 6, 153——172, 1983.
[8] Price, A. T., The theory of the magnetoteiiuric method when the source field is considered, J. Geophys. Res., 67, 1907——1918, 1962.
[9] 陈伯舫,对"磁暴短周期感应场和佘山地区地慢电导率"一文的讨论,地球物理学报,26, 295——298, 1983.
[10] Lilley, F. E. M., Running waves and standing ovaves in geomagnetic depth sounding, J. Geopsagn. Geoelec., 27, 491——504, 1975.
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