This online database contains intensity data for the majority of historical earthquakes in the UK, and also for some modern ones. This resource is still under development; not all earthquakes are represented; particularly, many smaller earthquakes are omitted.Further earthquakes will be added to the database in the future. The intensity scale used throughout is the European Macroseismic Scale (EMS-98). Note that the visualisation software may not work in some older browsers (e.g. versions of Internet Explorer before IE9) without installing a plugin.The database has been developed in the frame of the activities of the EU NERIES project (NA4 module "a Distributed Archive of Historical Earthquake Data"), using the MIDOP software developed by Mario Locati, INGV, whose assistance is gratefully acknowledged.