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基于频率-波数域算法的理论地震波形图方法, 可以数值模拟频率达到10 Hz、 震中距达1000 km的区域理论地震波形图. 该算法适用于计算大量分层地壳结构中激发的导波Lg波. 本文在前苏联东哈萨克斯坦地下核试验场至我国乌鲁木齐台站间的地球介质速度模型中, 引入速度梯度结构、 速度扰动分布的薄叠加层结构、 降低Q值结构以及速度扰动与Q值变化的综合结构来模拟实际地壳波导结构, 较好地模拟出东哈萨克斯坦地下核爆炸地震在乌鲁木齐台站记录的宽频带地震波形图, 模拟出完整的Lg波序列, 该序列符合Lg波能量分布特征, 且能够解释Lg波波尾的特征. 结果表明, Lg波的形状和峰值结构均依赖于地壳的不同波导结构. 相似文献
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In the asymmetric and symmetric nonlinear--metal--nonlinear dielectric structures, this paper studies the analytic dispersion relation for surface plasmon in a system consisting of a thin metallic film covered on two sides media of intensity-dependent refractive indexes by applying a generalised first integral approach. Especially in the symmetric waveguide structure, two possible modes can exist: the odd mode and the even mode. The dispersion relations of the two modes are obtained. Due to the nonlinear dielectric, the squared magnitude of the electric field at the interface appears and alters the dispersion relations. Numerical results are compared to those from a certain approximate treatment. 相似文献
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