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dc.contributor.authorallLorito, S.; Dipartimento di Scienze Fisiche, Università «Federico II», Napoli, Italyen
dc.contributor.authorallGiberti, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italiaen
dc.contributor.authorallSiniscalchi, A.; Dipartimento di Geologia e Geofisica,Università di Bari, Italyen
dc.contributor.authorallIorio, M.; Istituto IAMC, Geomare Sud, CNR, Napoli, Italyen
dc.description.abstractWe 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.en
dc.format.extent1312516 bytesen
dc.relation.ispartofAnnals of Geophysicsen
dc.relation.ispartofseries3/46 (2003)en
dc.subjectgeodynamo simulationsen
dc.subjectexcursions and reversalsen
dc.subjectEarth's orbital parametersen
dc.titleWavelet analysis on paleomagnetic (and computer simulated) VGP time seriesen
dc.subject.INGV04. Solid Earth::04.05. Geomagnetism::04.05.06. Paleomagnetismen
dc.description.journalTypeJCR Journalen
dc.contributor.authorLorito, S.en
dc.contributor.authorGiberti, G.en
dc.contributor.authorSiniscalchi, A.en
dc.contributor.authorIorio, M.en
dc.contributor.departmentDipartimento di Scienze Fisiche, Università «Federico II», Napoli, Italyen
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italiaen
dc.contributor.departmentDipartimento di Geologia e Geofisica,Università di Bari, Italyen
dc.contributor.departmentIstituto IAMC, Geomare Sud, CNR, Napoli, Italyen
item.fulltextWith Fulltext-
crisitem.classification.parent04. Solid Earth- Nazionale di Geofisica e Vulcanologia (INGV), Sezione ONT, Roma, Italia-à degli Studi di Bari- per l’ Ambiente Marino Costiero, IAMC, Consiglio Nazionale delle Ricerche, Calata Porta di Massa 80, I-80133 Napoli, Italy- Nazionale di Geofisica e Vulcanologia-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
Appears in Collections:Annals of Geophysics
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