GEOMAGIA50 - Home

Welcome to the GEOMAGIA50.v3 database

NEWS: 01.06.2019
Release of GEOMAGIA50.v3.3.

Major changes to version 3.3 of GEOMAGIA50:

(1) Addition of new data. Over 2350 new entries from over 160 publications have been added to the database. This includes the majority of papers published between 2013 and May 2019, as well as numerous legacy studies. A focus was placed on improving equatorial and southern Hemisphere coverage, as can be seen in the figure below. The new reference IDs are 540, 541 and 730-889. Additional notes on the new entries can be found in the log file here.

(2) 344 entries were either deleted or replaced by new UIDs (see the log file here).

(3) 567 entries were updated with new data. This could be palaeomagnetic data, ages, or other information related to any of the other data or metadata fields (see the log file here).



Map of all archaeomagnetic and volcanic locations in GEOMAGIA50. Red = GEOMAGIA50.v3.2; Blue = GEOMAGIA50.v3.3.

Minor Updates:

(1) Two new fields have been added called CROSS_REF_ID and CROSS_UID. CROSS_REF_ID shows other reference IDs where the same site with different palaeomagnetic or age data has been investigated. CROSS_UID shows specific UIDs where there are different palaeomagnetic or age data from the same site. Some sites have been investigated by multiple researchers and these have been included to highlight were multiple palaeomagnetic data exist for the same site. Please note that these entries are not comprehensive. If you find that there are multiple data entries for the same site, please contact us and we will add cross references.

(2) Back-calculated k values have been removed.

(3) The C14 table has been removed at this time as it requires wholesale revision. Uncalibrated 14C ages for new entries are given in the log file.

All revisions made by Maxwell Brown (University of Iceland) and Gwenaël Hervé (Université Bordeaux Montaigne/Université Renne 1).

Please cite the latest version of the database as GEOMAGIA50.v3.3 and add the date the data were downloaded. The relevant publication to cite remains:

Brown, M.C., F. Donadini, M. Korte, A. Nilsson, K. Korhonen, A. Lodge, S.N. Lengyel and C.G. Constable, GEOMAGIA50.v3: 1. General structure and modifications to the archeological and volcanic database , Earth Planets Space 67:83, doi:10.1186/s40623-015-0232-0.

Please note that there are still likely errors within the database. If you find errors please contact Maxwell Brown (maxwell@hi.is). Through a community effort this will greatly improve the quality of the database.
About GEOMAGIA50
GEOMAGIA50 is an international collaboration to provide easy access to published archeomagnetic/volcanic and sediment paleomagnetic and chronological data for the past 50 ka. It has been funded by the National Science Foundation (NSF and the German Research Foundation (DFG) SPP 1488 and is or has been supported by the following institutions:

GFZ Potsdam, University of California San Diego, University of Freiburg, University of Liverpool and the University of Helsinki.

This web interface allows users to search the database by data type using chronological and geographical constraints.
Updates and Error Checking
Please check the log webpage for corrections and updates to the database.

Current update: 1st June 2019.
Previous update: 24th July 2017.


If you spot any errors in the database please contact Maxwell Brown (University of Iceland). We appreciate any user feedback on the database.
Citations
If you use this database please cite it. Two papers describing the functionality of GEOMAGIA50.v3 have now been published in Earth Planets Space. For queries made from 2015 onwards using the archeo/volcanic database please cite: For the sediment database please cite: For queries made prior to 2015 please cite:
Archeomagnetic and Volcanic Database
At present, the archeomagetic and volcanic database contains over 9000 entries of geomagnetic field directions and intensities.

The GEOMAGIA50 archeomagnetic/volcanic interface allows:
  • selecting and downloading archeomagnetic/volcanic data using various constraints.
  • calculating ARCH3k.1, CALS3k.4, CALS10k.1b, SED3k.1 and pfm9k.1a geomagnetic field model outputs for any location with the option to download the model output as text files. Descriptions of the models can be found here.
  • plotting data and models in time.
  • visualizing data using Google Earth.
Sediment Database
The sediment database currently contains approximately 45,000 individual (specimen/stratigraphic) level data entries from 52 locations, 5000 processed (averaged/smoothed) data entries from 19 locations, 450 radiocarbon ages from 38 locations and 640 general age data from 8 locations. More data will be added with time, so please revisit the database.

The GEOMAGIA50 sediment interface allows:
  • selecting, downloading and online viewing of sediment data using temporal and geographic constraints.
  • calculating and downloading SED3k.1, ARCH3k.1, CALS3k.4, CALS10k.1b and pfm9k.1a geomagnetic field model outputs based on the above constraints. Descriptions of the models can be found here.
If you have comments or suggestions feel free to contact Maxwell Brown (University of Iceland).