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Seismic constraints on the present‐day kinematics of the Gargano foreland, Italy, at the transition zone between the southern and northern Apennine belts
Author(s) -
Milano Girolamo,
Di Giovambattista Rita,
Ventura Guido
Publication year - 2005
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2005gl024604
Subject(s) - foreland basin , geology , seismology , induced seismicity , transition zone , discontinuity (linguistics) , front (military) , lithosphere , geomorphology , geophysics , tectonics , mathematical analysis , oceanography , mathematics
The 1995–2004 seismicity in the Gargano Promontory (hereafter GP) foreland at the transition zone between Southern and Northern Apennine belts (Italy) is analyzed with the aim to put constraints on the present‐day kinematics of this key‐area of the foreland. The spatial distribution of earthquakes and 54 calculated focal mechanisms show that that the main GP ruptures develop along E‐W striking, right‐lateral strike‐slip faults and NW‐SE, normal to left‐lateral second‐order faults that move in response to a prevailing NW‐SE compression (i.e. NE‐SW extension). Tacking into account the depth of the relocated seismicity and the available geological information, we propose that the GP shear zone represents an E‐W striking, major crustal discontinuity separating sectors of the foreland that move in response to the higher, northeastward propagation velocity of the thrust front of the Northern Apennines with respect to that of the Southern Apennines.