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.
(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.
Concurrently, the production of new archeomagnetic data strongly increased as a result of the European AARCH project (2002 to 2006) (Figure 1), which aimed to improve European regional reference curves for geomagnetic dating of archeological materials (e.g., Gómez-Paccard et al. In June 2008, archeo/volcanic directions and intensity data with increased metadata were made accessible through an updated data model in GEOMAGIA50.v2 ( which included global data sets compiled for specific modeling purposes (Constable et al. In contrast, the simpler structure and web query interface provided by GEOMAGIA50 provides a straightforward way to recover selected but extremely useful results with specific attributes from identified locations and age ranges.
(2006a); Márton and Ferencz (2006); Schnepp and Lanos (2006); Tema et al. Mag IC also accepts these more limited data sets, and since 2007, the collaborative intent has been to share information between GEOMAGIA50 and Mag IC, so that effort expended in populating one database does not need to be duplicated later.
(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.
Furthermore, variations in the rock magnetic properties of sediments can reflect changes in environment, climate, and anthropogenic impact. 2015) address updates and extensions to the most recent version of the GEOMAGIA50 database and web portal (GEOMAGIA50.v3). (2011); Tema and Kondopoulou (2011)) or in comparing magnetic field variations in sediment records from different locations (e.g., Nilsson et al. This has led to the expansion of the chronological metadata included in the latest version of the database.
Greater detail on the applications of data within GEOMAGIA50 are described in the ‘Applications of archeomagnetic and volcanic data from GEOMAGIA50’ section and a companion paper (Brown et al. 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. A recognition of issues concerning the fidelity of archeological materials and lavas to accurately record the intensity of the geomagnetic field led to the inclusion of detailed metadata on paleointensity methods. (2010) give recent overviews of data types and experimental methods employed to gain magnetic field information from archeological material, lavas and sediments, in particular for the Holocene epoch. In parallel with the development of GEOMAGIA50, databases under the Magnetics Information Consortium (Mag IC; Constable et al.
Modern databases serve as digital libraries for research, with data archived at multiple levels and sophisticated search and analysis tools that allow users to find, visualize, and analyze a greater amount of data than ever before.