利用地壳测深资料研究剪切波分裂与偏振异常
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摘要: 利用地壳测深三分向记录,研究了 S 波基底结构和 S 波分裂与偏振异常,进一步讨论了利用 S 波分裂与偏振特征研究地壳介质地震各向异性,区域构造应力场作用方向和潜在震源物理标志的技术途径.通过对长江三峡坝区及外围深地震测深资料的典型 S 波记录分析研究,进一步证明了 S波分裂与偏振异常是研究地壳介质地震各向异性、区域构造应力场作用方向的可靠依据.同时也表明了地壳测深资料具有震源位置确定,能可靠追踪 S 波射线路径等优点,对识别异常体和适当扩大 S 波有效观测窗口是十分有利的.
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[1] Alekseev, A. S.,1988. Shear waves in lithosphere studies on the territory of the U. S. S. R. . Tectonphysics, 154,227——239.
[2] Crampin, S.,Evans, R. and Barry, K. A.,1984. Earthquake prediction: a new physical basis. Geophys. J. R. astr.Soc.,76, 147——156.
[3] Crampin, S.,Booth , D. C.,Krasnova, M. A.,Chesnokov, E. M.,Maximov, A. B. and Tarasov, N. T.,1986. Shear wave polarizations in the peter the first Range indicating crack——induced anisotropy in a thrust——fault regine, Geophys J. R. astr. Soc.,84, 401——412.
[4] Nur, A. and Simmons, G.,1969. Stress——induced velocity and isotropy in rock: an experimental study. J. Geophys. Res. 74,6667——6674.
[5] Nur, A. ahd Byerlee, J. D.,1971. An exact effecive stress law for elastic deformation of rock with faults. J. Geophys. Res., 76,6414——6419.[1] Alekseev, A. S.,1988. Shear waves in lithosphere studies on the territory of the U. S. S. R. . Tectonphysics, 154,227——239.
[2] Crampin, S.,Evans, R. and Barry, K. A.,1984. Earthquake prediction: a new physical basis. Geophys. J. R. astr.Soc.,76, 147——156.
[3] Crampin, S.,Booth , D. C.,Krasnova, M. A.,Chesnokov, E. M.,Maximov, A. B. and Tarasov, N. T.,1986. Shear wave polarizations in the peter the first Range indicating crack——induced anisotropy in a thrust——fault regine, Geophys J. R. astr. Soc.,84, 401——412.
[4] Nur, A. and Simmons, G.,1969. Stress——induced velocity and isotropy in rock: an experimental study. J. Geophys. Res. 74,6667——6674.
[5] Nur, A. ahd Byerlee, J. D.,1971. An exact effecive stress law for elastic deformation of rock with faults. J. Geophys. Res., 76,6414——6419.
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