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Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/9857
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dc.contributor.authorallDe Santis, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italiaen
dc.contributor.authorallQamili, E.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italiaen
dc.contributor.authorallWu, L.en
dc.date.accessioned2015-06-11T06:36:34Zen
dc.date.available2015-06-11T06:36:34Zen
dc.date.issued2013-11-28en
dc.identifier.urihttp://hdl.handle.net/2122/9857en
dc.description.abstractThe geomagnetic field is subject to possible reversals or excursions of polarity during its temporal evolution. Considering that: (a) in the last 83 million yr the typical average time between one reversal and the next (the so-called chron) is around 400 000 yr, (b) the last reversal occurred around 780 000 yr ago, (c) more excursions (rapid changes in polarity) can occur within the same chron and (d) the geomagnetic field dipole is currently decreasing, a possible imminent geomagnetic reversal or excursion would not be completely unexpected. In that case, such a phenomenon would represent one of the very few natural hazards that are really global. The South Atlantic Anomaly (SAA) is a great depression of the geomagnetic field strength at the Earth’s surface, caused by a reverse magnetic flux in the terrestrial outer core. In analogy with critical point phenomena characterized by some cumulative quantity, we fit the surface extent of this anomaly over the last 400 yr with power law or logarithmic functions in reverse time, also decorated by logperiodic oscillations, whose final singularity (a critical point tc) reveals a great change in the near future (2034±3 yr), when the SAA area reaches almost a hemisphere. An interesting aspect that has recently been found is the possible direct connection between the SAA and the global mean sea level (GSL). That the GSL is somehow connected with SAA is also confirmed by the similar result when an analogous critical-like fit is performed over GSL: the corresponding critical point (2033±11 yr) agrees, within the estimated errors, with the value found for the SAA. From this result, we point out the intriguing conjecture that tc would be the time of no return, after which the geomagnetic field could fall into an irreversible process of a global geomagnetic transition that could be a reversal or excursion of polarity.en
dc.language.isoEnglishen
dc.publisher.nameEGUen
dc.relation.ispartofNatural Hazards and Earth System Sciences (NHESS)en
dc.relation.ispartofseries/13(2013)en
dc.subjectgeomagnetic transitionsen
dc.subjectgeomagnetic reversalsen
dc.titleToward a possible next geomagnetic transition ?en
dc.typearticleen
dc.description.statusPublisheden
dc.type.QualityControlPeer-revieweden
dc.description.pagenumber3395-3403en
dc.identifier.URLwww.nat-hazards-earth-syst-sci.net/13/3395/2013/en
dc.subject.INGV04. Solid Earth::04.05. Geomagnetism::04.05.02. Geomagnetic field variations and reversalsen
dc.identifier.doi10.5194/nhess-13-3395-2013en
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dc.description.obiettivoSpecifico1A. Geomagnetismo e Paleomagnetismoen
dc.description.journalTypeJCR Journalen
dc.description.fulltextopenen
dc.relation.issn1561-8633en
dc.relation.eissn1684-9981en
dc.contributor.authorDe Santis, A.en
dc.contributor.authorQamili, E.en
dc.contributor.authorWu, L.en
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italiaen
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italiaen
item.openairetypearticle-
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 Roma2, Roma, Italia-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma2, Roma, Italia-
crisitem.author.deptChina University of Mining and Technology, School of Environment Science and Spatial Informatics, Xuzhou, China-
crisitem.author.orcid0000-0002-3941-656X-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.classification.parent04. Solid Earth-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
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