COMMENTS

The Gubbio North Source is the northernmost section of an active major tectonic 
structure known as the Gubbio Fault. The identification and description of this source 
are partially based on knowledge available concerning the Gubbio South Source, which 
was the locus of the 29 April 1984 earthquake, and on regional-scale tectonic 
considerations. Unlike the Gubbio South and Gubbio Middle sources, however, this 
source lies outside the Gubbio basin along the presumed northwestward continuation 
of the main seismogenic trend along the crest of the Apennines. The reader is 
encouraged to refer to the Comments and Open Questions text written for the Gubbio 
South Source for generalities about these adjacent sources and for a general discussion 
on the geology and tectonics of the region.


OPEN QUESTIONS

1) Is the Gubbio North Source truly a separate entity from the Gubbio Middle Source, as 
suggested by stratigraphic and structural evidence?

2) Should this source be interpreted as antithetic to the Altotiberina Fault, which 
should mark its bottom level? 

3) What is the true depth of this source? Does the fault extend down-dip enough to 
have the potential for a moderate-size earthquake?
