A Databank was created using data from 25 local catalogues and 30 special studies
of earthquakes in central, northern and northwestern Europe. Event types were
discriminated, fake events and duplets eliminated, and different magnitudes and
intensities converted to Mw. The conversions require the establishment of regression
equations. The Catalogue contains tectonic events from the Databank within the area
44°N-72°N, 25°W-32°E and the time period 1300-1993 which have Mw magnitudes
of 3.50 and larger. The area is covered by different polygons. Within each polygon
only data from one or a small number of the local catalogues, supplemented by data
from special studies, enter the Catalogue. If there are two or more such catalogues or
studies providing a solution for an event, a priority algorithm selects one entry for
the Catalogue. Then Mw is calculated from one of the magnitude types, or from
macroseismic data, given by the selected entry according to another priority scheme.
The origin time, location, Mw magnitude and reference are specified for each entry
of the Catalogue. So is the epicentral intensity, I0, if provided by the original source.
Following these criteria, a total of about 5,000 earthquakes constitute the Catalogue.
Although originally derived for the purpose of seismic hazard calculation within
GSHAP, the Catalogue provides a data base for many types of seismicity and
seismic hazard studies.