COMMENTS

Based on preliminary observations we propose for the Alpago Source the following 
geometrical characteristics:

- the length (18 km) is based on scaling with width, constrained by empirical 
relationship between magnitude and rupture area;

- the down-dip width (9.0 km) is based on the assumptions made concerning the 
minimum and maximum faulting depth, constrained by empirical relationship of 
rupture area with respect to magnitude;

- the strike (N206) is chosen according with the general orientation of mapped 
tectonic structures;

- the fault dips 55 towards the northwest;

- the rake is assumed to be 50 (reverse faulting with left-lateral component) based on 
strike and on general geodynamic considerations;

- the minimum and maximum depth (1.0 and 8.4 km respectively) are constrained by 
subsurface geology and by the lack of evidence of coseismic surface faulting;

The 29 June 1873 earthquake is the only event reported in the current catalogues 
(CPTI, 1999) that can be associated with the Alpago Source based on damage 
distribution.

We propose that the Alpago Source is a segment of the transfer fault linking the 
Maniago reverse fault, which is the southernmost thrust front of the Venetian Alps, 
with the Bassano reverse fault.

The area that experienced the strongest effects is found in the Alpago valley and also 
just south of the Cansiglio. This mesoseismic zone is very similar to that of the 1936 
Cansiglio earthquake.


OPEN QUESTIONS

1) What is the true faulting mechanism of the Alpago Source?

2) What are the relationships between the Alpago Source and the Cansiglio Source?

3) What are the slip rate and the average return time of the Alpago Source?
