A CLUSTER OF EARTHQUAKES IN THE APENNINES AT THE END OF 13TH-CENTURY

The assessment of seismicity in many areas of Italy hinges on poorly k nown earthquakes listed by the seismic catalogue on the grounds of sin gle, poor quality data taken from seismological compilations which, in most cases, did not adopt a consistently critical outlook in processi ng their miscellaneous information. Starting from such datasets it was easy to misunderstand, lose and duplicate evidence and events. This s tudy was initiated to see whether better results might be attained by a more careful reprocessing of the same data already gathered by compi lations. Six important, but poorly known, earthquakes were listed by t he Italian catalogue in the selected time-window (1292-1294): accordin g to the results of the study one of them is to be back-dated by a cen tury, three others should be reduced to one, another can be confirmed and the last one is a fake.