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首页> 外文会议>2006 IEEE US/EU Baltic International Symposium >Influence of watersaturated sedimentary layer on recording of seismic signals by bottom seismograph
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Influence of watersaturated sedimentary layer on recording of seismic signals by bottom seismograph

机译：水饱和沉积层对底部地震仪记录地震信号的影响

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Specific distortions exist, which are caused by resonance during recording of seismic signals at the sea bottom. In a number of papers these distortions are explained by the fluctuations of heavy seismograph case on a soft elastic layer of sediment. There are however experimental results, which do not correspond to such models. In this paper the reological characteristics of seabed sediment are considered, which practically were not taken into account earlier. A viscous — plastic model (Bingham model) was used for research. Parameters of the model were defined on the basis of the experiment. The obtained estimates showed that in the frequency range 0.003–30 Hz used in broadband seismology the influence of mass seismograph on the results of recording on soft bottom is negligible. Essential distortions can appear only when the seismograph is located on rubber-like foundation: peat, aggregations of seaweed, etc. The resonant phenomena during recording of signals on seabed can appear from propagating seismic waves through the water-bearing sediment layer. These phenomena manifest themselves more clearly for shear waves, compression waves propagating through sediment layer with comparatively smaller distortions.
机译：存在特定的失真，这些失真是由在海底记录地震信号期间的共振引起的。在许多论文中，这些变形是由沉重的地震仪外壳在沉积物的柔软弹性层上的波动所解释的。但是，存在实验结果，这些结果与此类模型不符。本文考虑了海底沉积物的生物学特征，但实际上并未较早考虑。粘性塑料模型（宾厄姆模型）用于研究。在实验的基础上定义了模型的参数。所获得的估计值表明，在宽带地震学中使用的0.003–30 Hz频率范围内，质量地震仪对软底记录结果的影响可以忽略不计。仅当地震仪位于类似橡胶的地基上时，才会出现基本的扭曲：泥炭，海藻聚集等。在海床上记录信号期间，共振现象可能会通过在含水沉积层中传播的地震波出现。这些现象在剪切波，压缩波传播穿过沉积层且变形相对较小的情况下更为明显。

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