COMMENTS

The Adige Plain source is included in the Database as a 15 km-long, N255-striking, 
30N-dipping blind thrust fault. The strike of the fault has been chosen following 
geodynamic and geological considerations, which suggest that the buried front of the 
Alps in the Po Plain changes in strike in the Mantova-Verona area and then merges 
with the pedealpine fronts of the Veneto Plain.

The source location was constrained through geomorphological observations 
(diversion of the Adige River and other anomalies in hierarchically subordinate 
streams) and topographic anomalies. More specifically, down-valley from Verona the 
Adige River  flows following a ESE direction instead of along the largest regional 
topographic gradient (directed towards the SSE). The main river diversion and the 
presence of paleo-channels of the Adige south of it are both consistent with progressive 
tectonic uplift of the area between San Giovanni Lupatoto and Ronco all'Adige, which is 
interpreted to lie on top of the anticline.

The 3 January  1117 earthquake occurred in the region between Verona and Ronco 
all'Adige, although the uncertainty in the location of such an old earthquake is quite 
large. Nevertheless, the current epicentral location from the CPTI catalogue is 
consistent with the location of the growing structure described above.

This source, together with the Orzinuovi and Mantova sources, would be part of a
south-verging thrust system that represents the southernmost active front of the back-
chain of the Southern Alps.


OPEN QUESTIONS

1) What are the relationships between the Adige Plain and neighbouring seismogenic 
sources?

2) Is the Adige Plain source the easternmost structure of the buried Alps thrust 
front of the Po Plain? What is the role played by the nearby Schio-Vicenza Line?

3) Is the Adige Plain Source truly he causative fault of the 1117 earthquake in the
Verona area?
