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Marine palaeoseismology from very high resolution seismic imaging: the Gondola Fault Zone (Adriatic foreland)
Author(s) -
Di Bucci D.,
Ridente D.,
Fracassi U.,
Trincardi F.,
Valensise G.
Publication year - 2009
Publication title -
terra nova
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.353
H-Index - 89
eISSN - 1365-3121
pISSN - 0954-4879
DOI - 10.1111/j.1365-3121.2009.00895.x
Subject(s) - geology , foreland basin , seismology , fault (geology) , anticline , strike slip tectonics , vertical displacement , slip (aerodynamics) , tectonics , active fault , paleontology , physics , thermodynamics
Abstract We present a marine palaeoseismology analysis of a dense network of very high resolution seismic profiles along the Gondola Fault Zone (GFZ), a right‐lateral, E–W‐striking, active fault system in the Adriatic foreland. This case‐study aims to show how time and space variations in the activity of a dominantly right‐lateral fault system can be assessed using the vertical component of slip. The GFZ has been investigated for a length of 50 km. It includes two parallel subvertical fault sets and two main anticlines. The late Middle Pleistocene to Holocene vertical component of displacement along the fault is bell‐shaped, suggesting that in the long‐term the fault zone acts as a single, kinematically coherent structure. Slip rates are 0–0.18 mm a −1 and vary temporally on individual segments. This variability is consistent with a model in which individual fault segments rupture independently during earthquakes with magnitudes up to 6.4 and 1.3–1.8 ka recurrence intervals.