Wavelet analysis on paleomagnetic (and computer simulated) VGP time series
We present Continuous Wavelet Transform (CWT) data analysis of Virtual Geomagnetic Pole (VGP) latitude time series. The analyzed time series are sedimentary paleomagnetic and geodynamo simulated data. Two mother wavelets (the Morlet function and the first derivative of a Gaussian f...
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| Format: | Article |
| Language: | English |
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Istituto Nazionale di Geofisica e Vulcanologia (INGV)
2003-06-01
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| Series: | Annals of Geophysics |
| Subjects: | |
| Online Access: | http://www.annalsofgeophysics.eu/index.php/annals/article/view/3429 |
| _version_ | 1811323168858570752 |
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| author | A. Siniscalchi G. Giberti S. Lorito M. Iorio |
| author_facet | A. Siniscalchi G. Giberti S. Lorito M. Iorio |
| author_sort | A. Siniscalchi |
| collection | DOAJ |
| description | We present Continuous Wavelet Transform (CWT) data analysis of Virtual Geomagnetic Pole (VGP) latitude time series. The analyzed time series are sedimentary paleomagnetic and geodynamo simulated data. Two mother wavelets (the Morlet function and the first derivative of a Gaussian function) are used in order to detect features related to the spectral content as well as polarity excursions and reversals. By means of the Morlet wavelet, we estimate both the global spectrum and the time evolution of the spectral content of the paleomagnetic data series. Some peaks corresponding to the orbital components are revealed by the spectra and the local analysis helped disclose their statistical significance. Even if this feature could be an indication of orbital influence on geodynamo, other interpretations are possible. In particular, we note a correspondence of local spectral peaks with the appearance of the excursions in the series. The comparison among the paleomagnetic and simulated spectra shows a similarity in the high frequency region indicating that their degree of regularity is analogous. By means of Gaussian first derivative wavelet, reversals and excursions of polarity were sought. The analysis was performed first on the simulated data, to have a guide in understanding the features present in the more complex paleomagnetic data. Various excursions and reversals have been identified, despite of the prevalent normality of the series and its inherent noise. The found relative chronology of the paleomagnetic data reversals was compared with a coeval global polarity time scale (Channel et al., 1995). The relative lengths of polarity stability intervals are found similar, but a general shift appears between the two scales, that could be due to the datation uncertainties of the Hauterivian/Barremian boundary. |
| first_indexed | 2024-04-13T13:49:15Z |
| format | Article |
| id | doaj.art-aed012c82a654338b76742a453162eb1 |
| institution | Directory Open Access Journal |
| issn | 1593-5213 2037-416X |
| language | English |
| last_indexed | 2024-04-13T13:49:15Z |
| publishDate | 2003-06-01 |
| publisher | Istituto Nazionale di Geofisica e Vulcanologia (INGV) |
| record_format | Article |
| series | Annals of Geophysics |
| spelling | doaj.art-aed012c82a654338b76742a453162eb12022-12-22T02:44:24ZengIstituto Nazionale di Geofisica e Vulcanologia (INGV)Annals of Geophysics1593-52132037-416X2003-06-0146310.4401/ag-3429Wavelet analysis on paleomagnetic (and computer simulated) VGP time seriesA. SiniscalchiG. GibertiS. LoritoM. IorioWe present Continuous Wavelet Transform (CWT) data analysis of Virtual Geomagnetic Pole (VGP) latitude time series. The analyzed time series are sedimentary paleomagnetic and geodynamo simulated data. Two mother wavelets (the Morlet function and the first derivative of a Gaussian function) are used in order to detect features related to the spectral content as well as polarity excursions and reversals. By means of the Morlet wavelet, we estimate both the global spectrum and the time evolution of the spectral content of the paleomagnetic data series. Some peaks corresponding to the orbital components are revealed by the spectra and the local analysis helped disclose their statistical significance. Even if this feature could be an indication of orbital influence on geodynamo, other interpretations are possible. In particular, we note a correspondence of local spectral peaks with the appearance of the excursions in the series. The comparison among the paleomagnetic and simulated spectra shows a similarity in the high frequency region indicating that their degree of regularity is analogous. By means of Gaussian first derivative wavelet, reversals and excursions of polarity were sought. The analysis was performed first on the simulated data, to have a guide in understanding the features present in the more complex paleomagnetic data. Various excursions and reversals have been identified, despite of the prevalent normality of the series and its inherent noise. The found relative chronology of the paleomagnetic data reversals was compared with a coeval global polarity time scale (Channel et al., 1995). The relative lengths of polarity stability intervals are found similar, but a general shift appears between the two scales, that could be due to the datation uncertainties of the Hauterivian/Barremian boundary.http://www.annalsofgeophysics.eu/index.php/annals/article/view/3429CWTVGPgeodynamo simulationsexcursions and reversalsEarth's orbital parameters |
| spellingShingle | A. Siniscalchi G. Giberti S. Lorito M. Iorio Wavelet analysis on paleomagnetic (and computer simulated) VGP time series Annals of Geophysics CWT VGP geodynamo simulations excursions and reversals Earth's orbital parameters |
| title | Wavelet analysis on paleomagnetic (and computer simulated) VGP time series |
| title_full | Wavelet analysis on paleomagnetic (and computer simulated) VGP time series |
| title_fullStr | Wavelet analysis on paleomagnetic (and computer simulated) VGP time series |
| title_full_unstemmed | Wavelet analysis on paleomagnetic (and computer simulated) VGP time series |
| title_short | Wavelet analysis on paleomagnetic (and computer simulated) VGP time series |
| title_sort | wavelet analysis on paleomagnetic and computer simulated vgp time series |
| topic | CWT VGP geodynamo simulations excursions and reversals Earth's orbital parameters |
| url | http://www.annalsofgeophysics.eu/index.php/annals/article/view/3429 |
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