| 利用Lg波谱特征估计地下核爆炸装置的埋深 |
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| 引用本文： | 何永锋,李锴,刘炳灿.利用Lg波谱特征估计地下核爆炸装置的埋深[J].西北地震学报,2015,37(2):601-605. |
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| 作者姓名： | 何永锋 李锴 刘炳灿 |
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| 作者单位： | 装甲兵工程学院 |
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| 基金项目： | 国家自然科学基金项目(40874023,41374068) |
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| 摘 要： | Lg波同时携带地球介质结构信息和爆炸源引起的二次源信息,是研究地下爆炸震源机制及检测、识别手段的重要震相。基于对某一区域介质结构的了解,将实测Lg波谱特征形态与理论波谱形态进行比对,利用Lg波频谱曲线的低谷点随震源深度"左移"的特征,作为辅助识别手段估计地下核爆炸装置的埋深。研究结果对深入地理解地下核爆炸震源机制有重要的参考意义。
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| 关 键 词： | Lg波 波谱低谷点 谱比 |
| 收稿时间： | 2014/7/9 0:00:00 |
Estimation of Underground Nuclear Explosive Device Depth Using Lg-wave Spectrum |
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| HE Yong-feng,LI Kai and LIU Bing-can.Estimation of Underground Nuclear Explosive Device Depth Using Lg-wave Spectrum[J].Northwestern Seismological Journal,2015,37(2):601-605. |
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| Authors: | HE Yong-feng LI Kai and LIU Bing-can |
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| Institution: | HE Yong-feng;LI Kai;LIU Bing-can;Academy of Armored Forces Engineering; |
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| Abstract: | The efficient frequency-wave number code could synthesize high-frequency (10 Hz) regional seismograms (up to a distance of more than 1 000 km) in a medium consisting of a large number of crustal layers,and investigate the effects of regional wave guides on Lg-waves.Lg-waves contain source information and the effect of the near-source structure.The scattering of explosion-generated Rg into S appears to be the primary contributor to the low-frequency Lg from nuclear explosive devices.For three typical crustal models,the synthetic seismograms calculated for EXP and Spall sources show that the generation mechanism of Lg-waves can be explained by a compensated linear-vector dipole source.If the velocity structure is well known,then the Lg-waveform can be synthesized,so we can compare the theoretical Lg-wave''s spectrum with the observation''s spectrum,and the results can not only be used to estimate the depth of the underground explosion equipment but also a discriminant. A deep understanding of the mechanism of the generation of Lg-waves can help us to create a new discriminant. |
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| Keywords: | Lg-wave spectral null spectral ratios |
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