GEOMAGIA50.v3: 2. A new paleomagnetic database for lake and marine sediments

Brown, M. C.; Donadini, F.; Nilsson, Andréas; Panovska, Sanja; Frank, Ute; Korhonen, Kimmo; Schuberth, M.; Korte, Monika; Constable, Catherine

doi:10.1186/s40623-015-0233-z

Cited by 63 publications

(71 citation statements)

References 128 publications

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“…), which included global data sets compiled for specific modeling purposes (Constable et al 2000;Genevey et al 2008;Donadini et al 2009) and incorporated data from the AARCH project. At this time, it was also envisaged that future modifications would allow incorporation of sediment records; however, this was not realized until GEOMAGIA50.v3 (see Brown et al 2015).…”

Section: Introductionmentioning

confidence: 98%

“…Since 2008, GEOMAGIA50 has been queried 10,264 times (approximately 1,700 queries per year) and Donadini et al (2006) and Korhonen et al (2008) have 53 unique citations between them. This paper and its companion (Brown et al 2015) address updates and extensions to the most recent version of the GEOMAGIA50 database and web portal ). The first version of the database provided convenient access not only to intensity data spanning ages of 0 to 50 ka, but also included a wealth of information about any associated paleomagnetic directions, experimental and dating methods, materials, number of samples measured, and other metadata (see Korhonen et al (2008)).…”

Section: Introductionmentioning

confidence: 98%

“…Although version 2 data were described in part in Donadini et al (2009), no comprehensive publication described the data model and the web-based user query form of GEOMAGIA50.v2. We remedy this by documenting the update of the database to GEOMAGI50 .v3, which has been expanded to accommodate sedimentary paleomagnetic, rock magnetic, and geochronological data (see Brown et al (2015)), in addition to a wider range of results from archeological and volcanic materials ('Modifications and updates to the archeomagnetic and volcanic database' section). We note in particular the inclusion of a greater number of archeomagnetic and volcanic directional data, more extensive chronological data and additional metadata, as well as modifications to the user interface that allow more refined data searches, the calculation and plotting of geomagnetic field model predictions, and visualization of data locations within Google Earth.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, variations in the rock magnetic properties of sediments can reflect changes in environment, climate, and anthropogenic impact. Greater detail on the applications of data within GEOMAGIA50 are described in the 'Applications of archeomagnetic and vol canic data from GEOMAGIA50' section and a companion paper (Brown et al 2015), which describes the substantial modifications made to the database to include sediment data.…”

Section: Introductionmentioning

confidence: 99%

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GEOMAGIA50.v3: 1. general structure and modifications to the archeological and volcanic database

et al. 2015

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Background: GEOMAGIA50.v3 is a comprehensive online database providing access to published paleomagnetic, rock magnetic, and chronological data from a variety of materials that record Earth's magnetic field over the past 50 ka.Findings: Since its original release in 2006, the structure and function of the database have been updated and a significant number of data have been added. Notable modifications are the following: (1) the inclusion of additional intensity, directional and metadata from archeological and volcanic materials and an improved documentation of radiocarbon dates; (2) a new data model to accommodate paleomagnetic, rock magnetic, and chronological data from lake and marine sediments; (3) a refinement of the geographic constraints in the archeomagnetic/volcanic query allowing selection of particular locations; (4) more flexible methodological and statistical constraints in the archeomagnetic/volcanic query; (5) the calculation of predictions of the Holocene geomagnetic field from a series of time varying global field models; (6) searchable reference lists; and (7) an updated web interface. This paper describes general modifications to the database and specific aspects of the archeomagnetic and volcanic database. The reader is referred to a companion publication for a description of the sediment database. Conclusions:The archeomagnetic and volcanic part of GEOMAGIA50.v3 currently contains 14,645 data (declination, inclination, and paleointensity) from 461 studies published between 1959 and 2014. We review the paleomagnetic methods used to obtain these data and discuss applications of the data within the database. The database continues to expand as legacy data are added and new studies published. The web-based interface can be found at http:// geomagia.gfz-potsdam.de.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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GEOMAGIA50.v3: 1. general structure and modifications to the archeological and volcanic database

et al. 2015

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“…The web-based interface can be found at http://geomagia.gfz-potsdam.de. In addition, Brown et al (2015b) presented a new database for sediments built upon the above-mentioned GEOMAGIA50. v3.…”

Section: Paleomagnetism: Databasementioning

confidence: 99%

Special issue on “Recent advances in environmental magnetism and paleomagnetism”

et al. 2016

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Further evidence of the Levantine Iron Age geomagnetic anomaly from Georgian pottery

Shaar

Tauxe

Goguitchaichvili

et al. 2017

Geophysical Research Letters

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Recent archaeomagnetic data from ancient Israel revealed the existence of a so‐called “Levantine Iron Age geomagnetic anomaly” (LIAA) which spanned the first 350 years of the first millennium before the Common Era (B.C.E.) and was characterized by a high averaged geomagnetic field (virtual axial dipole moments, VADM > 140 Z Am2, nearly twice of today's field), short decadal‐scale geomagnetic spikes (VADM of 160–185 Z Am2), fast field variations, and substantial deviation from dipole field direction. The geographic constraints of the LIAA have remained elusive due to limited high‐quality paleointensity data in surrounding locations. Here we report archaeointensity data from Georgia showing high field values (VADM > 150 Z Am2) in the tenth or ninth century B.C.E., low field values (VADM < 60 Z Am2) in the twelfth century B.C.E., and fast field variation in the fifth and fourth centuries B.C.E. High field values in the time frame of LIAA have been observed so far only in three localities near the Levant: Eastern Anatolia, Turkmenistan, and now Georgia, all located east of longitude 30°E. West of this, in the Balkans, field values in the same time are moderate to low. These constraints put geographic limits on the extent of the LIAA and support the hypothesis of an unusually intense regional geomagnetic anomaly during the beginning of the first half of the first millennium B.C.E., comparable in area and magnitude (but of opposite sign) to the presently active South Atlantic anomaly.

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GEOMAGIA50.v3: 2. A new paleomagnetic database for lake and marine sediments

Cited by 63 publications

References 128 publications

GEOMAGIA50.v3: 1. general structure and modifications to the archeological and volcanic database

GEOMAGIA50.v3: 1. general structure and modifications to the archeological and volcanic database

Special issue on “Recent advances in environmental magnetism and paleomagnetism”

Further evidence of the Levantine Iron Age geomagnetic anomaly from Georgian pottery

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