Logs

July 2017:
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.
July 2015:
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).
June 2015:
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.
May 2015:
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.
July 2014:
35 sediments locations now included into the database and pfm9k.1a model of Nilsson et al. (2014) added to the search interface.
December 2013:
29 sediments locations now included into the database.
August 2013:
Structure of the sediment database finalized.
October 2011:
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).
June 2010:
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
December 2008:
Alexandra Lodge spotted some duplicates and errors.
After this correction the database includes 7902 data from 372 studies.
June 2008:
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.
June 2008:
The article on the VADM variation as studied using the GEOMAGIA database is published in EPSL.
22.04.2008:
The article describing the functionality of the GEOMAGIA database is published in G3.
16.04.2007:
The article in PEPI showing a study on the reliability of different materials and methods on the paleointensity determination.
14.04.2006:
The first article describing the features of GEOMAGIA appears in EOS
6.11.2006:
GEOMAGIA50 database (Version 1) is available online with 3702 paleointensity estimates from a collection of 159 studies.