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首页> 外文期刊>Journal of geodynamics >A search for the Slichter triplet with superconducting gravimeters: Impact of the density jump at the inner core boundary
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A search for the Slichter triplet with superconducting gravimeters: Impact of the density jump at the inner core boundary

机译：用超导重力仪搜索Slichter三重态：内核边界处密度跳跃的影响

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摘要

Knowledge of the Earth's inner and outer core structure can be considerably improved by the observation of the translational motion of the inner core, the so-called Slichter triplet. The theory for deriving the elastic-gravitational mode frequencies is still controversial and many observational attempts to detect the triplet have so far been unsuccessful. The period of the Slichter modes depends directly of the value of the density jump at the inner core boundary (ICB). We propose a detection method based on the seismological theory for the splitting of the modes. Depending on the density jump at ICB, new theoretical periods for the Slichter modes are computed and the corresponding frequency splittings are used to detect possible candidates. The scanning of the product spectrum obtained after stacking five time-varying gravity records from superconducting gravimeters after the 2001 Peruvian earthquake has confirmed the detection of the _2S_1 seismic mode, but the application after stacking one-year datasets has not led to any convincing candidate for the Slichter triplet at this stage.
机译：通过观察内核（所谓的Slichter三重态）的平移运动，可以大大改善对地球内外核结构的了解。推导弹性引力模式频率的理论仍存在争议，迄今为止，许多观察到的检测三重态的尝试均未成功。 Slichter模式的周期直接取决于内芯边界（ICB）处密度跳跃的值。我们提出了一种基于地震理论的模式分裂检测方法。根据ICB处的密度跃变，计算Slichter模式的新理论周期，并使用相应的分频来检测可能的候选者。对2001年秘鲁地震后从超导重力仪上堆积了五个随时间变化的重力记录而获得的产品谱图的扫描，证实了_2S_1地震模式的检测，但是在堆叠一年的数据集后的应用并没有产生任何令人信服的候选在这个阶段的Slichter三胞胎。

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