Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/1218
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dc.contributor.authorallMakris, J. P.; Technological Educational Institute of Crete, Department of Electronics (Branch of Chania), Chalepa, Chania, Crete Island, Greeceen
dc.date.accessioned2006-07-05T08:02:52Zen
dc.date.available2006-07-05T08:02:52Zen
dc.date.issued2001-04en
dc.identifier.urihttp://hdl.handle.net/2122/1218en
dc.description.abstractThe reliable detection and identification of electrotelluric anomalies that could be considered as precursory phenomena of earthquakes become fundamental aspects of earthquake prediction research. Special arrangements, in local and/or regional scale, of the geoelectric structure beneath the measuring point, may act as natural real-time "filters" on the ULF electrotelluric data improving considerably the signal to "magnetotelluric-noise" ratio of anomalies originated by probably non-magnetotelluric sources. Linear polarization, i.e. local channelling of the electric field on the surface is expected in cases where 3D-local inhomogeneities, producing strong shear distortion, are present in the vicinity of the monitoring site and/or when a 2D-regional geoelectrical setting exhibits high anisotropy. By assuming different generation mechanisms and modes of propagation for the electrotelluric anomalies that could be considered earthquake precursory phenomena, a rotationally originated residual electrotelluric field results, eliminating background magnetotelluric-noise and revealing "hidden" transient variations that could be associated to earthquakes. The suggested method is applicable in real-time data collection, thus simplifies and accelerates the tedious task of identification of suspicious signals. As an indicative example, the case of Ioannina (located in Northwestern Greece) is presented. The local polarization of the electrotelluric field varies dramatically even at neighboring points although the regional geoelectric strike direction does not change.+en
dc.format.extent4990659 bytesen
dc.format.mimetypeapplication/pdfen
dc.language.isoEnglishen
dc.relation.ispartofseries2/44 (2001)en
dc.subjectElectrotelluricen
dc.subjectGreeceen
dc.subjectmagnetotelluricen
dc.subjectMohr circleen
dc.subjectnoise reductionen
dc.subjectseismic precursoren
dc.subjecttensor decompositionen
dc.titleProperties of the geoelectric structure that promote the detectionof electrotelluric anomalies: the case of Ioannina, Greeceen
dc.typearticleen
dc.type.QualityControlPeer-revieweden
dc.subject.INGV04. Solid Earth::04.06. Seismology::04.06.02. Earthquake interactions and probabilityen
dc.description.journalTypeJCR Journalen
dc.description.fulltextopenen
dc.contributor.authorMakris, J. P.en
dc.contributor.departmentTechnological Educational Institute of Crete, Department of Electronics (Branch of Chania), Chalepa, Chania, Crete Island, Greeceen
item.openairetypearticle-
item.cerifentitytypePublications-
item.languageiso639-1en-
item.grantfulltextopen-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.fulltextWith Fulltext-
crisitem.author.deptTechnological Educational Institute of Crete, Greece-
crisitem.classification.parent04. Solid Earth-
Appears in Collections:Annals of Geophysics
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