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Role and effects of pore fluid pressure in thrusting: The case history of the Umbria‐Marche Apennines, central Italy
Author(s) -
Cello Giuseppe,
Deiana Giovanni
Publication year - 1995
Publication title -
tectonics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.465
H-Index - 134
eISSN - 1944-9194
pISSN - 0278-7407
DOI - 10.1029/95tc00928
Subject(s) - geology , wedge (geometry) , thrust , tectonics , deformation (meteorology) , seismology , petrology , fold and thrust belt , fluid pressure , geometry , mechanics , oceanography , physics , mathematics , thermodynamics , foreland basin
Structure, timing and rates of deformation, and the aspect ratio of the external zones of the Umbria‐Marche thrust system (UMTS) have been investigated with the aim of comparing features and processes occurring during the growth of a tectonic wedge with those inferred from mechanically based model predictions. The results of the UMTS test seem to support the idea that most of the characteristic features of a thrust system may be considered as the result of the incremental, transient increase of the pore fluid pressure ( Pf ) as a consequence of the amount of shortening of a crustal section. The strong dependence of Pf on strain rates and on the thickness of the rock mass involved in the deformation may also help to explain local and/or regional variations in the aspect ratio of the deformed‐state profiles of different fold and thrust belts.