COMMENTS

The Pordenone North source is included in the Database as a 8 km-long, N215-striking, 
30N-dipping thrust fault. Its geometry was extrapolated from neighbouring faults and 
from considerations of regional tectonics.

The Pordenone North Source is associated with the 25 October 1812, Me=5.7 earthquake. 
The solution obtained using intensity data alone and the geological solution are in good 
agreement; both suggest the presence of an active blind thrust front buried in the Veneto 
Plain.

To the southwest the Cansiglio Source, associated with the 1936 Bosco del Cansiglio 
earthquake, is a reverse fault belonging to the pedealpine thrust front, and is located in 
an inner position with respect to the Pordenone North Source.

These observations led to the hypothesis that there may exist two active thrust fronts in 
the Veneto-Friuli region, one located at the mountain front (e.g.: the Cansiglio Source), 
and the other buried in the plain (e.g.: Pordenone North Source).

The distribution of historical earthquakes in the Veneto-Friuli region seems to indicate 
the presence of a gap to the north-east of the Pordenone North Source.


OPEN QUESTIONS

1) What are the relationships between the Pordenone North source and the 
neighbouring seismogenic sources?

2) Are there active buried thrusts to the northeast of the Pordenone North Source?

3) Are there active pedealpine thrusts to the northeast of the Cansiglio Source?

4) Can the hypothesis of a double active thrust front in the Veneto-Friuli area be 
confirmed by additional geological observations?
