The GEOMAGIA database

01/22/2021: Release of a revision of GEOMAGIA50.v3.4.

(1) 755 entries from 7 publications have been added to the database.

(2) 213 entries were deleted or replaced, 73 were updated. See here.

01/09/2020: Release of GEOMAGIA50.v3.4.

(1) Over 500 new entries from 28 publications primarily from 2019 and 2020 have been added to the database.

(2) 150 entries updated with new age of palaeomagnetic information, see here.

01/06/2019: Release of GEOMAGIA50.v3.3.

There are three main changes to v3.3 of the database:

(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).

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 or 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.

Click here for a log file listing notes on newly added data, entries that were updated between v3.2 and v3.3, a list of entries removed between v3.2 and v3.3.

The output from GEOMAGIA50.v3.3 (24/07/2017) in the form of a csv can be found here.

24/07/2017: Release of GEOMAGIA50.v3.2.

There are two main changes in version 3.2 of GEOMAGIA50:

(1) The inclusion of new and updated directional data from the UK and Ireland. 422 entries already in GEOMAGIA50.v3 were checked and updated where necessary and 487 new directional data were added to GEOMAGIA50. This work was done in collaboration with Cathy Batt (University of Bradford) and coworkers. This new dataset was used to created a temporally continuous spherical harmonic model of geomagnetic field changes over the UK and Ireland from 5000 BCE to 1990 CE. The model named ARCH-UK.1 is available through the "Archeomagnetic and volcanic query form". Predictions of all field components along with uncertainties can be produced for any location within the UK and Ireland.

Further details of the new British dataset can be found in Batt et al., 2017, Journal of Archaeological Science. Please cite this publication along with Brown et al., Earth Planets Space, 2015a, if you use British data or ARCH-UK.1 through GEOMAGIA50.

A log file noting all the changes made to updated British entries as well as useful information on the new British entries added to GEOMAGIA can be found at here. Please also see the "Magnetic Moments in the Past Database" for further site and context information associated with British archaeomagnetic data.

(2) Over 2000 entries have been corrected for small errors. Some new entries have been added and some entries have been removed or partially removed. Click here for a log file listing the changes. This is the first installment of changes in an ongoing effort to improve the quality of the data within GEOMAGIA50.

Elisabeth Schnepp (Montanuniversitaet Leoben, Austria) and Gabrielle Hellio are thanked for correcting some of the entries.

Please cite the latest version of the database as GEOMAGIA50.v3.2 and add the date that you downloaded the data.

The output from GEOMAGIA50.v3.1 (21/07/2015) in the form of a csv can be found here.

Minor Updates:

An additional search option has been added to the first panel of the archaeomagnetic and volcanic query, allowing the user to select whether entries constrained by archeomagnetic or palaeomagnetic dating are returned or not.

Three extra output columns have been included: Uploader, Editor and Last Edit Date.

Models CALS10k.2 and ARCH10k.1 (Constable et al, 2016) and HFM.OL1.AL1 (Constable et al., 2016, Panovska et al, 2015) can now be queried on the "Archeomagnetic and volcanic query form".

An error in plotting and output model uncertainties has been corrected.

The appearance of the plots has been improved.

21/07/2015: Region corrected for data from reference 159 (UID 3545-3550).

07/07/2015: Mary Kovacheva, Gwenaël Hervé and Sanja Panovska noticed duplicated entries. UIDs 8939-8982 from references 503, 504, 505 and 506 have been removed.

Gwenaël Hervé spotted some errors in references 485 (UIDs 8665-8667), 505 and 506 (UIDs 8854-8893), and provided some additional data for references 505 and 506 (UIDs 8854-8893 have been updated and UID 9850 added).

The paper describing the general structure of GEOMAGIA50.v3 and updates to the archaeomagnetic and volcanic database has now been published in Earth Planets Space. Click here for the article.

18/06/2015: The location search for the sediments was improved, e.g., to find all Lake Biwa results the user only needs so enter "Lake Biwa", rather than "Lake Biwa 1" etc.

Some data for the Adriatic, Ionian and Tyrrhenian seas and Lake Biwa were corrected.

22/06/2015: Mary Kovacheva noticed duplicated entries: reference ID 434 (UID 8291-8294) and 509 (UID 9672-9675). Reference ID 434 and UIDs 8291-8294 have now been removed.

The paper describing GEOMAGIA50.v3 sediment database has now been published in Earth Planets Space. Click here for the article.

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 location and 640 general age data from 8 locations.

35 sediments locations now included into the database and pfm9k.1a model of Nilsson et al. (2014) added to the search interface.

29 sediments locations now included into the database.

Structure of the sediment database finalized.

New millenial scale model CALS10K.1b (Korte et al., 2011) and CALS3k.4 (Korte and Constable, 2011) included.
References 445-484 added thanks to collaboration with Stacey Lengyel (Illinois State Museum).

GEOMAGIA50 was updated with the new studies and has a new interface. New features include:

Calculation of various spherical harmonics models at any location
Visualization of data and models using Google Earth

Alexandra Lodge spotted some duplicates and errors.
After this correction the database includes 7902 data from 372 studies.

GEOMAGIA50 Version 2 is online at the Scripps Institution of Oceanography. New features include:

A thorough update to add the directional data
Implementation of multiple selectable query parameter
Selection of longitudes crossing the Prime Meridian
Plotting of all geomagnetic parameters using Python
Saving the CALS7k.2 model as a text file

After the new update the database includes 8044 data.

The article on the VADM variation as studied using the GEOMAGIA database is published in EPSL.

The article describing the functionality of the GEOMAGIA database is published in G3.

The article in PEPI showing a study on the reliability of different materials and methods on the paleointensity determination.

The first article describing the features of GEOMAGIA appears in EOS

GEOMAGIA50 database (Version 1) is available online with 3702 paleointensity estimates from a collection of 159 studies.