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Feasibility analysis of searching for the Slichter triplet in superconducting gravimeter records

ISSN号：1674-9847
期刊名称：Geodesy and Geodynamics
时间：2015
页码：307-315
分类：TP271.71[自动化与计算机技术—控制科学与工程;自动化与计算机技术—检测技术与自动化装置] P223.6[天文地球—大地测量学与测量工程;天文地球—测绘科学与技术]
作者机构：[1]School of Geodesy and Geomatics, Wuhan Uniuersity, Wuhan 430079, China, [2]State Key Laboratory of Information Engineering in Surueying, Mapping and Remote Sensing, Wuhan Uniuersity, Wuhan 430079, China
相关基金：This study is supported by the National 973 Program of China （2013CB733305） and the National Natural Science Foundation of China （41174011, 41429401, 41210006, 41128003, 41021051, 41B74007）.
相关项目：三轴分层地球自转的章动、极移和日长变化研究

作者： Shen, W.|Luan, W.|

关键词：超导重力仪, r模, 非平稳噪声, 叠加方式, 地球动力学, 激发源, 时间序列, 记录时间, Slichter tripletExcitation sourceSynthetic SG （superconductinggravimeter） seriesStacking

中文摘要：

The search for the elusive Slichter triplet requires elaborate analysis of the elastic-gravitational mode characters and the non-stationary behavior of noisy time-series.A typical question is that it is difficult to characterize the excitations with attenuation by diffusion when their intensity is low compared to noise.Thus the theory for deriving the modes’frequencies is still controversial,and various scholars tried to search for the Slichter triplet in superconducting gravimeter(SG)records,but failed.One of the main causes might be due to the inappropriate use of datasets.We present in this paper synthetic experiments on the selection of record length,sampling rate and number of SG records under the Global Geodynamics Project(GGP)to detect the damped harmonic signals hidden in noises based on the optimal sequence estimation(OSE)method.Moreover,our results show that the existing observation conditions arouse restrictions and it might be impossible to detect the Slichter triplet excited by single excitation source based on Fourier spectrum analysis.Thus we suggest a stacking way of combining several seismic events in the case that the excitation mechanism has so far been unclear.

英文摘要：

The search for the elusive Slichter triplet requires elaborate analysis of the elastic-gravi- tational mode characters and the non-stationary behavior of noisy time-series. A typical question is that it is difficult to characterize the excitations with attenuation by diffusion when their intensity is low compared to noise. Thus the theory for deriving the modes＇ frequencies is still controversial, and various scholars tried to search for the Slichter triplet in superconducting gravimeter （SG） records, but failed. One of the main causes might be due to the inappropriate use of datasets. We present in this paper synthetic experiments on the selection of record length, sampling rate and number of SG records under the Global Geodynamics Project （GGP） to detect the damped harmonic signals hidden in noises based on the optimal sequence estimation （OSE） method. Moreover, our results show that the existing observation conditions arouse restrictions and it might be impossible to detect the Slichter triplet excited by single excitation source based on Fourier spectrum analysis. Thus we suggest a stacking way of combining several seismic events in the case that the excitation mechanism has so far been unclear.