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首页> 外文期刊>Bulletin of the Seismological Society of America >Coda of long-range arrivals from nuclear explosions
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Coda of long-range arrivals from nuclear explosions

机译：核爆炸产生的远程到达的尾声

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Short-period, three-component recordings from peaceful nuclear explosions (PNE) of the profile QUARTZ,located in Russia, are used to constrain the nature of the coda of PNE arrivals. In particular, we examine the unusually strong and extensive coda of the long-range P-n(interpreted as a whispering-gallery, WG) phase propagating to beyond 3000 km. Energy-balance considerations in three dimensions show that such an extensive coda is inherent not only to WG but to all other P-wave phases and can be explained by crustal scattering. The long coda is a result of excitation of short-period scattered waves (Pg, Sg, Lg, Rg) within the crust by the waves incident from the mantle, or, conversely, by generation of mantle phases from crustal guided waves within the source region. The resulting estimates of coda Q range between Q = 380 near 2 Hz and Q = 430 near 5 Hz and can be associated with crustal attenuation including the sediments. Our coda model also explains quantitatively the observed build-up of the arrival amplitude with time and the apparent lack of a pronounced coda of the body-wave arrivals from the mantle transition zone. These effects result from adding up the energy of the later arrivals arriving during the codas of earlier arrivals. We "deconvolve" the overlapping coda patterns and show that the true relative energies of the arrivals are significantly lower than the apparent energies measured from the raw records. A whispering-gallery interpretation of the long-range P-n and crustal scattering accounts for the entire range of observations of kinematic, spectral, and amplitude pattern of the PNE wavefield and allows the derivation of constraints on attenuation. [References: 36]
机译：位于俄罗斯的QUARTZ概况的和平核爆炸（PNE）的短期三部分记录用于限制PNE到达者的尾声的性质。特别是，我们研究了传播到3000公里以上的远距离P-n（被解释为耳语画廊，WG）阶段异常强壮且广泛的尾声。在三个维度上的能量平衡考虑表明，如此大的尾波不仅是WG固有的，而且是所有其他P波相位所固有的，并且可以用地壳散射来解释。长尾波是由于地幔入射的波激发地壳内短周期散射波（Pg，Sg，Lg，Rg）激发的结果，或者相反地，是由源内地壳导波产生的地幔相产生的。地区。尾声Q值的最终估计值介于2 Hz附近的Q = 380和5 Hz附近的Q = 430之间，并且可能与包括沉积物的地壳衰减有关。我们的尾声模型还定量地解释了观测到的到达振幅随时间的累积以及明显地缺乏来自地幔过渡带的体波到达的尾声。这些效果是由于在较早到达的尾声期间加起来较晚到达的能量而产生的。我们“解卷积”了重叠的尾声模式，表明到达的真实相对能量明显低于从原始记录测得的表观能量。对远距离P-n和地壳散射的耳语画廊解释涵盖了对PNE波场的运动学，光谱和振幅模式观察的整个范围，并允许推导衰减约束。 [参考：36]

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