An observation of PKJKP: Inferences on inner core shear properties
An observation of PKJKP: Inferences on inner core shear properties
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DOI：
10.1126/science.1109134
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发表时间：
2005-06-03
期刊：
影响因子：
56.9
通讯作者：
Takeuchi, N
中科院分区：
文献类型：
--
作者：
Cao, AM;Romanowicz, B;Takeuchi, N
地震相位 PKJKP 以剪切波形式穿过内核，并为其坚固性提供直接证据，但一直难以检测。使用来自德国加芬伯格阵列的堆叠宽带记录，我们记录了高信噪比相位，其到达时间和慢度与 PKJKP 的理论预测一致。这次到达的反向方位角也与 PKJKP 的预测一致，与伪液体内核模型的比较也是如此。 PKJKP 波形的包络模型意味着内核中随深度的剪切速度梯度略大于初步参考地球模型中的剪切速度梯度。
The seismic phase PKJKP, which traverses the inner core as a shear wave and would provide direct evidence for its solidity, has been difficult to detect. Using stacked broadband records from the Gafenberg array in Germany, we documented a high signal-to-noise phase, the arrival time and slowness of which agree with theoretical predictions for PKJKP. The back azimuth of this arrival is also consistent with predictions for PKJKP, as is the comparison with a pseudoliquid inner core model. Envelope modeling of the PKJKP waveform implies a shear velocity gradient with depth in the inner core that is slightly larger than that in the preliminary reference Earth model.