| 基于理论地震图方法的波导结构对 地下核爆炸Lg波传播特性研究 |
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| 引用本文： | 何永锋,李锴,刘炳灿,姚国政,赵克常,张献兵,曾乐贵.基于理论地震图方法的波导结构对 地下核爆炸Lg波传播特性研究[J].地震学报,2015,37(2):257-265. |
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| 作者姓名： | 何永锋 李锴 刘炳灿 姚国政 赵克常 张献兵 曾乐贵 |
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| 作者单位： | 1.中国北京 100072 装甲兵工程学院 |
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| 基金项目： | 国家自然科学基金(41374068)资助． |
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| 摘 要： | 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.
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| 关 键 词： | 频率-波数域算法 地下核爆炸 Lg波 |
| 收稿时间： | 2014-06-12 |
The characteristics of Lg waves induced by the underground nuclear explosions in the waveguides using frequency-wavenumber algorithm |
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| He Yongfeng,Li Kai,Liu Bingcan,Yao Guozheng,Zhao Kechang,Zhang Xianbing,Zeng Legui.The characteristics of Lg waves induced by the underground nuclear explosions in the waveguides using frequency-wavenumber algorithm[J].Acta Seismologica Sinica,2015,37(2):257-265. |
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| Authors: | He Yongfeng Li Kai Liu Bingcan Yao Guozheng Zhao Kechang Zhang Xianbing Zeng Legui |
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| Affiliation: | 1.Academy of Armored Force Engineering, Beijing 100072, China2.School of Earth and Space Sciences, Peking University, Beijing 100871, China |
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| Abstract: | Based on the frequency-wavenumber algorithm，we can simulate high frequency (10 Hz) regional seismograms (up to a distance of more than 1000 km). The algorithm is used to synthesize the regional waveguides on Lg waves in a medium consisting of a large number of crustal layers. Based on the crustal velocity model from a former Soviet nuclear test site located in eastern Kazakhstan to WMQ station in China, this paper build up a modified model consisting of thin layers with an alternating high and low-velocity, a velocity gradient near the surface， the lower Q values， and the composite structure of velocity perturbation and different Q values so as to match the real crustal structure. And then we simulate very well the regional seismograms in WMQ station by underground nuclear explosions of the test site in eastern Kazakhstan. The synthetic results conform to the energy distribution characteristics of Lg waves, and explain the feature of the coda. The numerical results suggest that the shapes and peak amplitudes of Lg waves all depend on the different crustal waveguides. |
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| Keywords: | frequency-wavenumber algorithm underground nuclear explosion Lg wave |
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