The Slichter mode of the Earth: Revisit with optimal stacking and autoregressive methods on full superconducting gravimeter data set

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Title:	The Slichter mode of the Earth: Revisit with optimal stacking and autoregressive methods on full superconducting gravimeter data set
Authors:	趙丰;Ding, Hao;Chao, Benjamin F.
Contributors:	地球科學學院地球科學學系
Keywords:	Amplitude;AR-z spectrum;Autoregressive processes;Compounding;Compounds;Data;Data analysis;Data processing;Detection;Earth;Earth core;Earth science;Geophysics;Gravimeters;Gravimetry;Methodology;optimal sequence estimation;Optimization;Records;Search methods;Searching;Slichter triplet mode;Splitting;Stacking;Superconductivity
Date:	2015-10-01
Issue Date:	2026-04-23 11:48:40 (UTC+8)
Publisher:	Wiley-Blackwell;Washington: Blackwell Publishing Ltd
Abstract:	摘要： The Slichter mode is the triplet oscillational mode of the 3‐D translation of the Earth's solid inner core; despite much effort it has so far eluded observation. Here we revisit the search by applying new data processing methods upon the latest set of available superconducting gravimeter (SG) data. The new methods are the AR‐z spectrum that is sensitive in detecting weak harmonic signals, and the OSE data stacking scheme proven to be effective in identifying seismic normal mode singlets. The SG data consist of 19 records from 14 worldwide stations spanning up to 15 years. We arrive at three candidate sets of frequencies for the Slichter triplet that satisfy the theoretical splitting rule, namely (3.952, 4.432, 4.908) cpd, (5.136/5.032/5.020, 5.592, 6.040) cpd, and (5.704, 6.208, 6.748) cpd, of which the first set is regarded to be the more likely. A series of synthetic experiments shows that the Slichter triplet signals with RMS received amplitude of ~0.3 nGal (10−11m/s2) can be detected to the extent of the present combination of data and methodology. Key Points New data processing methods to search for the Slichter mode in available SG data Three candidates, albeit nondefinitive, set of ST periods obtained Empirical detection threshold for ST using all available SG data is ~0.3 nGal 其他題名： J. Geophys. Res. Solid Earth 出版者： Washington: Blackwell Publishing Ltd 出版日期： 2015-10 出處： Journal of geophysical research. Solid earth, 2015-10, Vol.120 (10), p.7261-7272 資源來源： Wiley Online Library - AutoHoldings Journals 版權： 2015. American Geophysical Union. All Rights Reserved. 識別號： ISSN: 2169-9313 識別號： ISSN: 2169-9356 識別號： EISSN: 2169-9356 識別號： DOI: 10.1002/2015JB012203
Appears in Collections:	[Department of Earth Sciences ] journal & Dissertation

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