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层裂对区域震相Lg波的影响
引用本文:何永锋,陈晓非,张海明.层裂对区域震相Lg波的影响[J].地震学报,2005,27(3):309-316.
作者姓名:何永锋  陈晓非  张海明
作者单位:中国,北京,100871,北京大学地球与空间科学学院理论与应用地球物理研究所;中国,西安,710024,西北核技术研究所;中国,北京,100871,北京大学地球与空间科学学院理论与应用地球物理研究所
摘    要:地下核爆炸Lg波的激发机制, 目前尚未十分清楚. 普遍接受的观点是: 伴随层裂源的补偿线性矢量偶极源激发的Rg波的散射形成的S波, 是Lg波的最主要贡献因素. 本文利用频谱比对方法, 结合合成理论地震图方法, 基于东哈萨克斯坦地区速度模型, 分析了东哈萨克斯坦地壳速度模型下的层裂对区域震相Lg波的影响, 并进一步分析了该地区的实际观测资料. 结果表明, 层裂时间函数对Lg波具有扇贝形调制作用; Lg波振幅谱的低谷点源自于补偿线性矢量偶极(CLVD)源激发的Rg波. 这一结果也表明, 东哈萨克斯坦速度模型下的Lg波受层裂的调制作用, 与内华达试验区的Lg波是一样的, 进一步支持了Patton和Taylor的观点, 对于进一步理解及更好地利用Lg波具有重要理论指导意义. 

关 键 词:频谱比  Lg波  层裂  CLVD源  低谷点
文章编号:0253-3782(2005)03-0309-08
修稿时间:2004年3月10日

THE EFFECT OF SPALL ON Lg WAVES
He Yongfeng,Chen Xiaofei,ZHANG Haiming.THE EFFECT OF SPALL ON Lg WAVES[J].Acta Seismologica Sinica,2005,27(3):309-316.
Authors:He Yongfeng  Chen Xiaofei  ZHANG Haiming
Abstract:The generation mechanism of Lg wave from underground nuclear explosion is still not clear at present. The general viewpoint is that the S wave generated by the near-source scattering of explosion-generated Rg appears to be the primary contributor to the low-frequency Lg (0.2~2.0 Hz) from nuclear explosions. The viewpoint is supported by the analysis of regional data from several Yucca flats, NTS explosions by Patton and Taylor, who further indicated that the prominent low-frequency spectral null in Lg is due to Rg from a compensated linear vector dipole (CLVD) source. In this paper, the data from Kazakstan Test Sites are investigated by a spectral ratio method. We have found that the spectral ratio of Lg waves is characterized by a spectral scalloping and a pronounced null, and the spectral null does not shift with spall dwell times, showing a strong dependence on shot depth and a very good agreement with those expected from Rg due to a CLVD source.
Keywords:spectral ratio  Lg wave  spall  CLVD sorce  null  
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