Abstract
On the basis of MTS and DSS data in and near Tianshui region, the deep structure contour of the region was expounded. The regional distribution of the high conductive layer near the Moho in the region becomes one of the most obvious characters of the conductivity structure in the crust and mantle, and it is corresponding to the low S wave velocity zone near the Moho and is guessed as the transitional zone between the crust and mantle in the region. In this paper, the behaviour of medium and the thermodynamic circumstance of the conductive low shear velocity layer near the Moho were demonstrated emphatically, and the cause of formation of the layer was roughly explained under specified conditions of geographical environment and deep structure characters in this region.
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Li, Q. H., Min, X. Y., Zhou, M. D., Fan, B. and Wei, D. Q., 1991. The monograph of the interpretation and research of the DSS data in Tianshui seismic area.Northwestern Seismological Journal,13, Supp., 44–47 (in Chinese).
Liang, S. X., Wang, F. and Shi, S. Y., 1992. Study on geothermal heat flow in Tianshui seismic area. In:Annual of the Chinese Geophysical Society, 313–313. Seismological Press, Beijing (in Chinese).
Lin, C. Y., Zhang, Y. L., Liang, S. X., Si, Y. L., Jiang, M. and Jiang, Z., 1983. On the electrical change characteristics of conductivity distribution of the crust and upper mantle in some regions of Neimeng, Gansu and Ningxia.Northwestern Seismological Journal,5, 1, 31–42 (in Chinese).
Lin, C. Y., Zhang, Y. L., Si, Y. L., Jiang, M. and Li, G. Z., 1984a. Magnetotelluric study of the eastern region of the Hexi Corridor.Acta Geophysica Sinica,27, 131–143 (in Chinese).
Lin, C. Y., 1984b.Research on Magnetotelluric Sounding, 301–341. Seismological Press, Beijing (in Chinese).
Lin, C. Y. and Wu, Y. X., 1993. Preliminary study of the deep physical circumstance of seismic active zone near Tianshui region. In:Annual of the Chinese Geophysical Society, 156–156. Seismological Press, Beijing (in Chinese).
Lebechev, E. B. and Hidarov, N. I., 1979.Physical Property of Magma Lava, 40–99, Science Press, Moscow (in Russian).
Magnetotelluric Sounding Group of the Seismological Bridge of Lanzhou, 1976. The characteristics of the electrical structure in the crust and upper mantle of the northern section of the north-south seismic belt in China.Acta Geophysica Sinica,19, 28–34 (in Chinese).
Magnetotelluric Sounding Group of the Earthquake Research Institute of Lanzhou, 1987. The research on the relation of the conductive layers in the crust and upper mantle with the seismic activity of the norhtern section of the north-south seismic belt in China. In:The monograph of Exploration Geophysics, 2. Electromagnetic Sounding, 145–150. Geological Press, Beijing (in Chinese).
Min, X. Y., Zhou, M. D. and Zhang, Y. S., 1993. The 2-D distribution of the S wave velocity structure and Poisson ratio in the northern section of the north-south seismic belt in China. In:Annual of the Chinese Geophysical Society, 87–87. Seismological Press, Beijing (in Chinese).
Schmeling, H., 1986. Numerical models on the influence of partial melt on elastic, anelastic and electrical properties of rock. Part II: Electrical conductivity.Phys. Earth Plan. Int.,43, 123–136.
Zhou, M. D., Zhang, Y. S., Li, Q. H. and Fan, B., 1992.Q-structure in Tianshui seismic area.Annual of the Chinese Geophysical Society, 66–66. Seismological Press, Beijing (in Chinese).
Zhu, L. P., Zeng, R. S. and Wu, D. M., 1992. Crust upper mantle structure under the Tibetan Plateau using broadband teleseismic waveform. In:Annual of the Chinese Geophysical Society, 65–65. Seismological Press, Beijing (in Chinese).
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Lin, CY., Wu, YX. & Yang, CF. On the high conductive layer near the moho and the transitional zone between the crust and mantle in tianshui region. Acta Seismologica Sinica 8, 281–288 (1995). https://doi.org/10.1007/BF02650492
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DOI: https://doi.org/10.1007/BF02650492