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Authors: Valoroso, L.*
Chiaraluce, L.*
Collettini, C.*
Title: Earthquakes and fault zone structure
Title of journal: Geology (Geological Society of America)
Series/Report no.: 4/42 (2014)
Publisher: Geological Society of America
Issue Date: 24-Feb-2014
DOI: 10.1130/G35071.1
Keywords: fault zone structure; damage zone; aftershock sequence
Abstract: The characterization of fault zone structure and its evolution is essential for understanding earthquake mechanics and rupture evolution. Most of our knowledge about fault structure is derived from fi eld studies of ancient faults. By using earthquake locations, we reconstruct the complex structure of a normal fault at a resolution directly comparable with fi eld geological investigations. At the surface conjugate sets of faults are connected with the main fault plane, which with depth shows bending and dilational jogs. Parallel slipping planes occur at the base of the seismogenic volume, and minor synthetic and antithetic structures are widespread. Fault zone thickness ranges from 0.5 to 1.5 km, while the damage density decays exponentially away from the fault plane, with values comparable to those observed on fault outcrops. The strong similarities between seismological and geological images of fault structure indicate that earthquakes have a key role in the evolution of fault architecture
Appears in Collections:04.04.06. Rheology, friction, and structure of fault zones
Papers Published / Papers in press

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