Recent investigations of the 0-5 geomagnetic field recorded by lava flows

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dc.contributor.authorJohnson, Catherine L.
dc.contributor.authorConstable, Catherine G.
dc.contributor.authorTauxe, Lisa
dc.contributor.authorBarendregt, René W.
dc.contributor.authorBrown, Laurie L.
dc.contributor.authorCoe, Rob
dc.contributor.authorGans, Phil
dc.contributor.authorLayer, Paul
dc.contributor.authorMejia, Vicky
dc.contributor.authorOpdyke, Neil D.
dc.contributor.authorSinger, Brad
dc.contributor.authorStaudigel, Hubert
dc.contributor.authorStone, David
dc.date.accessioned2015-06-12T17:53:00Z
dc.date.available2015-06-12T17:53:00Z
dc.date.issued2015-06-12
dc.descriptionSherpa Romeo green journal (pre or post print only)en_US
dc.description.abstractWe present a synthesis of paleomagnetic directional data collected from 873 lava flows at 17 different locations under the collaborative Time Averaged geomagnetic Field Initiative (TAFI). The data range from 05 Ma in age, and provide new high quality data with improved spatial coverage. Data quality at each site is measured using k, the best estimate of the Fisherian precision parameter, and its influence on inclination anomaly and VGP dispersion is evaluated by systematically excluding data with successively higher values of k. When combined with regional compilations from NW USA, SW USA, Japan, New Zealand, Hawaii, Mexico, S. Pacific and the Indian Ocean, a data set of 2283 pairs of declination and inclination data, with k>100, and VGP latitudes greater than 45 is obtained. This is a more than 7fold increase over similar quality data in the existing Global Paleomagnetic Database (GPMDB). The new data set spans 78 S to 53 N, and has sufficient temporal and spatial sampling to allow characterization of latitudinal variations in the timeaveraged field (TAF) and paleosecular variation (PSV) for the Brunhes and Matuyama epochs, and for the 0–5 Myr interval combined. PSV, as measured by dispersion of virtual geomagnetic poles, shows less latitudinal variation than predicted by current statistical PSV models. Variation of inclination anomaly with latitude is assessed using 2parameter zonal TAF models – these have axial quadrupole contributions of 2% – 4% of the axial dipole term, and axial octupole contributions of 3% – 5%. Approximately 2% of the octupole signature is likely the result of bias incurred by averaging unit vectors. The new data set provides significant improvement over previous compilations, and can contribute to a new generation of global paleomagnetic field models.en_US
dc.description.peer-reviewYesen_US
dc.identifier.urihttps://hdl.handle.net/10133/3697
dc.language.isoen_CAen_US
dc.publisher.departmentDepartment of Geographyen_US
dc.publisher.facultyArts and Scienceen_US
dc.publisher.institutionUniversity of British Columbiaen_US
dc.publisher.institutionScripps Institution of Oceanography, University of Californiaen_US
dc.publisher.institutionUniversity of Lethbridgeen_US
dc.publisher.institutionUniversity of Massachussettsen_US
dc.publisher.institutionUniversity of California, Santa Cruzen_US
dc.publisher.institutionUniversity of California, Santa Barbaraen_US
dc.publisher.institutionUniversity of Alaskaen_US
dc.publisher.institutionUniversity of Floridaen_US
dc.publisher.institutionUniversity of Wisconsinen_US
dc.subjectPaleomagnetic directional dataen_US
dc.subjectLava flowsen_US
dc.subjectTime-Averaged Field Investigations (TAFI)en_US
dc.subjectGeomagnetic field
dc.subject0-5 Ma
dc.titleRecent investigations of the 0-5 geomagnetic field recorded by lava flowsen_US
dc.typeArticleen_US
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