Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/7883
AuthorsPierdominici, S.* 
Heidbach, O.* 
TitleRECENT TECTONIC STRESS FIELD STATE IN ITALY FROM NUMERICAL MODELLING ANALYSIS
Issue Date2010
URIhttp://hdl.handle.net/2122/7883
KeywordsPresent-day stress field
Tectonics
Stress sources
Numerical modeling analysis
Italy
Subject Classification04. Solid Earth::04.03. Geodesy::04.03.01. Crustal deformations 
04. Solid Earth::04.07. Tectonophysics::04.07.02. Geodynamics 
04. Solid Earth::04.07. Tectonophysics::04.07.04. Plate boundaries, motion, and tectonics 
04. Solid Earth::04.07. Tectonophysics::04.07.05. Stress 
04. Solid Earth::04.07. Tectonophysics::04.07.07. Tectonics 
AbstractWe examine the contemporary stress in Italy studying the present-day maximum horizontal stress orientation to characterize the relationship between active stress, past tectonic setting and the seismicity. The geodynamic setting of Italy is particularly complex. Italy is involved in the N-S convergence of Africa and Eurasian plates and currently undergoing NE-SW extension perpendicular to the Apenninic fold and thrust belt and with the opening of the Tyrrhenian basin (Late Tortonian). This process happens in the presence of still active subduction system extending from Sicily to northern Apennines, as confirmed by recently seismicity. This tectonic setting with highly variable plate boundary events and body forces induced by topography results in an inhomogeneous stress pattern. Here we quantify the spatial changes of the wavelength of the stress pattern by a statistical analysis. As input data we use 600 data of SH records from the World Stress Map database release 2008 and about 100 new data records. The result of this statistical analysis is a mean orientation of the maximum horizontal compressional stress SH on a 0.1° grid and the maximum smoothing radius for which the standard deviation of the mean SH orientation is less than 25°. This latter is the wave-length of the stress pattern and reveals for Italy that the entire region has wave-length less than 200 km for Italy.
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