Short-term vertical velocity field in the Apennines (Italy) revealed by geodetic levelling data

We estimate current vertical movements along the Apennines (Italy) through repeatedly measured high precision levelling routes. In order to highlight regional crustal deformation the analysis of a geodetic database, with a minimum benchmark density of 0.7 bm/km (1943–2003 time period), is carried out. We evaluate systematic and random error and their propagation along the levelling routes. Tests on original raw height data have been carried out to define error propagation. The computed relative vertical rates stand significantly above error propagation. A series of traverses along and across the Apennines and a map of relative vertical velocities reveal a geodetic signal characterised by values up to 2.5–3.0 mm/a and by wavelengths up to 100 km.

[1]  Gianluca Valensise,et al.  Catalogue of Strong Italian Earthquakes from 461 B.C. to 1997 (Appendix to volume 43 N° 4, 2000) , 2000 .

[2]  E. Boschi,et al.  European-Mediterranean regional centroid-moment tensor catalog: solutions for years 2001 and 2002 , 2004 .

[3]  N. D’Agostino,et al.  Interactions between mantle upwelling, drainage evolution and active normal faulting: an example from the central Apennines (Italy) , 2001 .

[4]  S. R. Holdahl.  Readjustment of leveling networks to account for vertical coseismic motions , 1986 .

[5]  L. Crescentini,et al.  Clues of postseismic relaxation for the 1915 Fucino earthquake (central Italy) from modeling of leveling data , 2004 .

[6]  S. R. Holdahl.  A model of temperature stratification for correction of leveling refraction , 1981 .

[7]  S. Arca,et al.  Prima sintesi geodetico-geologica sui movimenti verticali del suolo nell' Italia Settentrionale (1897-1957) , 1985 .

[8]  E. Patacca,et al.  Late thrust propagation and sedimentary response in the thrust-belt—foredeep system of the Southern Apennines (Pliocene-Pleistocene) , 2001 .

[9]  Gianluca Valensise,et al.  Deformation of the 125 ka marine terrace in Italy: tectonic implications , 1999, Geological Society, London, Special Publications.

[10]  Peter J. Clarke,et al.  Geodetic strain in peninsular Italy between 1875 and 2001 , 2002 .

[11]  J. Vignal.  Évaluation de la précision d’une méthode de nivellement , 1936 .

[12]  A. Amato,et al.  Erosional landsurfaces of the Campano–Lucano Apennines (S. Italy): genesis, evolution, and tectonic implications , 1999 .

[13]  A. Dziewoński,et al.  European–Mediterranean regional centroid-moment tensors: 1997–2000 , 2002 .

[14]  Walter H. F. Smith,et al.  New version of the generic mapping tools , 1995 .

[15]  Paolo Baldi,et al.  Crustal velocity and strain-rate fields in Italy and surrounding regions: new results from the analysis of permanent and non-permanent GPS networks , 2005 .

[16]  Claudio Chiarabba,et al.  A new view of Italian seismicity using 20 years of instrumental recordings , 2005 .

[17]  R. Bilham,et al.  Constraints on Himalayan deformation inferred from vertical velocity fields in Nepal and Tibet , 1994 .

[18]  Nicola D'Agostino,et al.  Crustal motion along the Eurasia-Nubia plate boundary in the Calabrian Arc and Sicily and active extension in the Messina Straits from GPS measurements , 2004 .

[19]  G. Vai,et al.  Anatomy of an orogen : the Apennines and adjacent Mediterranean basins , 2001 .

[20]  E. Boschi,et al.  European–Mediterranean Regional Centroid Moment Tensor catalog: Solutions for years 2003 and 2004 , 2007 .

[21]  E. Patacca,et al.  Quaternary kinematic evolution of the Southern Appennines. relationships between surface geological features and deep lithospheric structures , 1993 .