Wavelet decomposition in the earth’s gravity field investigation

Janusz Bogusz , Anna Kłos , Wiesław Kosek

Abstract

This paper presents the results of the application of wavelet decomposition to processing data from the GGP sites (The Global Geodynamics Project). The GGP is an international project within which the Earth's gravity field changes are recorded with high accuracy at a number of stations worldwide using superconducting gravimeters. Data with a 5-second sampling interval from Wettzell and Bad Homburg were used for the research. The wavelet transform enables the investigation of the temporal changes of the oscillation amplitudes or the decomposition of the time series for the analysis of the required frequencies. The wavelet decomposition was performed using the regular orthogonal symmetric Meyer wavelet. The research concerned data from an earthquake period recorded at various locations and a quiet period when the gravimeters worked without any disturbances. The decomposition was followed by the Fast Fourier Transform for signal frequency components and then by correlation analyses of corresponding frequency components (for periods from 10 to 60 000 seconds) for all sensor combinations, for the quiet and the earthquake periods separately. Frequency components defining long term changes for all sensor combinations, as well as combinations between two sensors at the same site for the quiet days are characterised by high correlation coefficients. For the time of the earthquake, the Wettzell site data proved strong correlation for all frequency components, while the Bad Homburg site data showed an unexpected decrease of correlation for the majority of frequency components. The authors also showed that wavelet decomposition can be a good method of data interpolation, especially from the time of earthquakes. Moreover, it is a very useful tool for filtering the data and removing the noises
Author Janusz Bogusz
Janusz Bogusz,,
-
, Anna Kłos
Anna Kłos,,
-
, Wiesław Kosek (FoEEaLS / DoG)
Wiesław Kosek,,
- Department of Geodesy
Journal seriesActa Geodynamica et Geomaterialia, ISSN 1214-9705, (A 20 pkt)
Issue year2013
Vol10
No1
Pages47-59
Publication size in sheets0.6
Keywords in EnglishGGP, wavelet decomposition, Earth’s gravity field changes
DOIDOI:10.13168/AGG.2013.0004
URL https://www.irsm.cas.cz/materialy/acta_content/2013_doi/Bogusz_AGG_2013_0004.pdf
Internal identifierWIŚIG/2013/133
Languageen angielski
Score (nominal)20
ScoreMinisterial score = 0.0, 26-07-2017, ArticleFromJournal
Ministerial score (2013-2016) = 20.0, 26-07-2017, ArticleFromJournal
Citation count*3 (2016-03-16)
Additional fields
Oświadczenie o afiliacjiWiesław Kosek = podwójna afiliacja - oświadczenie dołączone do publikacji
FinansowanieThis research is sponsored by the Polish Ministry of Science and Higher Education, grant No. 2011/01/B/ST10/05384.
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