Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/8938
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dc.contributor.authorallRiguzzi, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italiaen
dc.date.accessioned2014-02-19T15:17:37Zen
dc.date.available2014-02-19T15:17:37Zen
dc.date.issued2008-04en
dc.identifier.urihttp://hdl.handle.net/2122/8938en
dc.description.abstractFor the past 108 years the worldwide occurrence of large seismic events shows a significant cyclic temporal pattern of about 34 years. The spectral analysis of the irregular Earth's polar motion over the last 108 years filtered from the secular drifts shows that both LOD and polhody are affected by the same significant periodicity. The third amplitude of polar motion at decadal periodicity in the terrestrial reference frame, after the Chandler and annual, is known as Markowitz wobble. The spectral coherence between the seismicity and polar motion is high at long periods, reaching saturation value at about 20 years. No significant delay is shown by the cross-correlation analysis between LOD, polhody and seismicity. If we accept the idea that global seismicity and polar motion are both signed by the Markowitz wobble, we can infer that they could be modulated by the same cause. Recent models hypothesize a gravitational and inertial coupling between the mantle and an inner core able to reproduce the Markowitz wobble on the polar motion. However, if the wobble signature on seismicity will be confirmed, this interpretation should probably be reviseden
dc.language.isoEnglishen
dc.relation.ispartofEuropean Geophysical Union Symposiumen
dc.subjectMarkowitz wobbleen
dc.subjectglobal seismicityen
dc.subjectEarth rotationen
dc.titleIs global seismicity signed by the Markowitz wobble ?en
dc.typeConference paperen
dc.description.statusUnpublisheden
dc.subject.INGV04. Solid Earth::04.06. Seismology::04.06.05. Historical seismologyen
dc.description.ConferenceLocationViennaen
dc.relation.referencesEngdahl, E.R. and A. Villaseñor, Global Seismicity: 1900-1999, in W.H.K. Lee, H. Kanamori, P.C. Jennings, and C. Kisslinger (editors), International Handbook of Earthquake and Engineering Seismology, Part A, Chapter 41, pp. 665-690, Academic Press, 2002. Dunberry, M., 2008. Gravitational torque on the inner core and decadal polar motion, Geophys.J. Int., 172, 903- 920. Gross, R. S., I. Fukumori, and D. Menemenlis (2005), Atmospheric and oceanic excitation of decadalscale Earth orientation variations, J. Geophys. Res., 110, B09405. Varga, P., Gambis D., Bus Z., Bizouard C. 2005. The relationship between the global seismicity and the rotation of the Earth. In: proceedings of Systémes de référence spatio-temporales, Observatoire de Paris, 115-120.en
dc.description.obiettivoSpecifico1T. Geodinamica e interno della Terraen
dc.description.fulltextopenen
dc.contributor.authorRiguzzi, F.en
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione ONT, Roma, Italiaen
item.openairetypeConference paper-
item.cerifentitytypePublications-
item.languageiso639-1en-
item.grantfulltextopen-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.fulltextWith Fulltext-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione ONT, Roma, Italia-
crisitem.author.orcid0000-0003-3453-5110-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.classification.parent04. Solid Earth-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
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