Active deformation in Southern Italy, Sicily and southern Sardinia from GPS velocities of the Peri-Tyrrhenian Geodetic Array (PTGA)

Giuseppe Avellone, Raimondo Catalano, Fabrizio Pepe, Attilio Sulli, Gerardo Pappone, Ennio Marsella, Laura Maschio, John S. Oldow, Luigi Ferranti, Bruno D'Argenio, David Lewis

Risultato della ricerca: Article

45 Citazioni (Scopus)

Abstract

Campaign measurement (1995-2000) of Global Positioning System(GPS) site velocities in southern Italy, Central Mediterraneanarea, document differential displacements within the orogens rimmingthe Tyrrhenian Sea. Within the Southern Apennines, GPSvelocities define two laterally juxtaposed belts of deformation, withtranspression in the east and transtension in the west. In the east,~8 mm/yr convergence between northern Murge-Gargano block andthe International GPS System (IGS) site MATE is partitioned across~east-west striking right-lateral faults, consistent with seismicityand with the offshore geological record. To the south, in northernCalabria, site velocities relative to MATE indicate transpression at~5 mm/yr, not recorded by seismicity but consistent with the on-landand offshore geological record. In contrast, site velocities along theTyrrhenian Sea coast to the west diverge from MATE at 2-3.5 mm/yr,and are consistent with the crustal extension documented by seismicityand fault slip studies. The transpressional belt is tracked southwardacross the Ionian Sea by oblique convergence of central Sicilysites (2-6 mm/yr) relative to the IGS site NOTO in the Hyblean block.North-western Sicily sites display clockwise rotation, a patternreflected in the geological and paleomagnetic record. Ssignificanthorizontal motion accompanies rotation in north-western Sicily andis probably accommodated by west-northwest – east-southeast andnortheast-southwest-striking right- and left-oblique faults, respectively,consistent with a regional ~north-northwest – south-southeasttrending shortening axis. The ~east-west striking belt of contractionalearthquakes observed offshore northern Sicily is consistent with upto ~10 mm/yr geodetic convergence between Sicily and Sardinia.Southern Sardinia sites exhibits differential velocities relative to theIGS site CAGL, suggesting internal deformation which is notrecorded by seismicity and might signal incipient fragmentation ofthe Sardinia margin in response to relative convergence with Sicily.
Lingua originaleEnglish
pagine (da-a)299-316
Numero di pagine17
RivistaBOLLETTINO DELLA SOCIETÀ GEOLOGICA ITALIANA
Volume127
Stato di pubblicazionePublished - 2008

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GPS
geological record
seismicity
oblique fault
transtension
transpression
fault slip
fragmentation
coast
sea

All Science Journal Classification (ASJC) codes

  • Geology

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Active deformation in Southern Italy, Sicily and southern Sardinia from GPS velocities of the Peri-Tyrrhenian Geodetic Array (PTGA). / Avellone, Giuseppe; Catalano, Raimondo; Pepe, Fabrizio; Sulli, Attilio; Pappone, Gerardo; Marsella, Ennio; Maschio, Laura; Oldow, John S.; Ferranti, Luigi; D'Argenio, Bruno; Lewis, David.

In: BOLLETTINO DELLA SOCIETÀ GEOLOGICA ITALIANA, Vol. 127, 2008, pag. 299-316.

Risultato della ricerca: Article

Avellone, Giuseppe ; Catalano, Raimondo ; Pepe, Fabrizio ; Sulli, Attilio ; Pappone, Gerardo ; Marsella, Ennio ; Maschio, Laura ; Oldow, John S. ; Ferranti, Luigi ; D'Argenio, Bruno ; Lewis, David. / Active deformation in Southern Italy, Sicily and southern Sardinia from GPS velocities of the Peri-Tyrrhenian Geodetic Array (PTGA). In: BOLLETTINO DELLA SOCIETÀ GEOLOGICA ITALIANA. 2008 ; Vol. 127. pagg. 299-316.
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title = "Active deformation in Southern Italy, Sicily and southern Sardinia from GPS velocities of the Peri-Tyrrhenian Geodetic Array (PTGA)",
abstract = "Campaign measurement (1995-2000) of Global Positioning System(GPS) site velocities in southern Italy, Central Mediterraneanarea, document differential displacements within the orogens rimmingthe Tyrrhenian Sea. Within the Southern Apennines, GPSvelocities define two laterally juxtaposed belts of deformation, withtranspression in the east and transtension in the west. In the east,~8 mm/yr convergence between northern Murge-Gargano block andthe International GPS System (IGS) site MATE is partitioned across~east-west striking right-lateral faults, consistent with seismicityand with the offshore geological record. To the south, in northernCalabria, site velocities relative to MATE indicate transpression at~5 mm/yr, not recorded by seismicity but consistent with the on-landand offshore geological record. In contrast, site velocities along theTyrrhenian Sea coast to the west diverge from MATE at 2-3.5 mm/yr,and are consistent with the crustal extension documented by seismicityand fault slip studies. The transpressional belt is tracked southwardacross the Ionian Sea by oblique convergence of central Sicilysites (2-6 mm/yr) relative to the IGS site NOTO in the Hyblean block.North-western Sicily sites display clockwise rotation, a patternreflected in the geological and paleomagnetic record. Ssignificanthorizontal motion accompanies rotation in north-western Sicily andis probably accommodated by west-northwest – east-southeast andnortheast-southwest-striking right- and left-oblique faults, respectively,consistent with a regional ~north-northwest – south-southeasttrending shortening axis. The ~east-west striking belt of contractionalearthquakes observed offshore northern Sicily is consistent with upto ~10 mm/yr geodetic convergence between Sicily and Sardinia.Southern Sardinia sites exhibits differential velocities relative to theIGS site CAGL, suggesting internal deformation which is notrecorded by seismicity and might signal incipient fragmentation ofthe Sardinia margin in response to relative convergence with Sicily.",
keywords = "GPS velocities, Sicily, Southern Italy, active orogenic deformation, southern Sardinia, transpression and transtension fronts",
author = "Giuseppe Avellone and Raimondo Catalano and Fabrizio Pepe and Attilio Sulli and Gerardo Pappone and Ennio Marsella and Laura Maschio and Oldow, {John S.} and Luigi Ferranti and Bruno D'Argenio and David Lewis",
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TY - JOUR

T1 - Active deformation in Southern Italy, Sicily and southern Sardinia from GPS velocities of the Peri-Tyrrhenian Geodetic Array (PTGA)

AU - Avellone, Giuseppe

AU - Catalano, Raimondo

AU - Pepe, Fabrizio

AU - Sulli, Attilio

AU - Pappone, Gerardo

AU - Marsella, Ennio

AU - Maschio, Laura

AU - Oldow, John S.

AU - Ferranti, Luigi

AU - D'Argenio, Bruno

AU - Lewis, David

PY - 2008

Y1 - 2008

N2 - Campaign measurement (1995-2000) of Global Positioning System(GPS) site velocities in southern Italy, Central Mediterraneanarea, document differential displacements within the orogens rimmingthe Tyrrhenian Sea. Within the Southern Apennines, GPSvelocities define two laterally juxtaposed belts of deformation, withtranspression in the east and transtension in the west. In the east,~8 mm/yr convergence between northern Murge-Gargano block andthe International GPS System (IGS) site MATE is partitioned across~east-west striking right-lateral faults, consistent with seismicityand with the offshore geological record. To the south, in northernCalabria, site velocities relative to MATE indicate transpression at~5 mm/yr, not recorded by seismicity but consistent with the on-landand offshore geological record. In contrast, site velocities along theTyrrhenian Sea coast to the west diverge from MATE at 2-3.5 mm/yr,and are consistent with the crustal extension documented by seismicityand fault slip studies. The transpressional belt is tracked southwardacross the Ionian Sea by oblique convergence of central Sicilysites (2-6 mm/yr) relative to the IGS site NOTO in the Hyblean block.North-western Sicily sites display clockwise rotation, a patternreflected in the geological and paleomagnetic record. Ssignificanthorizontal motion accompanies rotation in north-western Sicily andis probably accommodated by west-northwest – east-southeast andnortheast-southwest-striking right- and left-oblique faults, respectively,consistent with a regional ~north-northwest – south-southeasttrending shortening axis. The ~east-west striking belt of contractionalearthquakes observed offshore northern Sicily is consistent with upto ~10 mm/yr geodetic convergence between Sicily and Sardinia.Southern Sardinia sites exhibits differential velocities relative to theIGS site CAGL, suggesting internal deformation which is notrecorded by seismicity and might signal incipient fragmentation ofthe Sardinia margin in response to relative convergence with Sicily.

AB - Campaign measurement (1995-2000) of Global Positioning System(GPS) site velocities in southern Italy, Central Mediterraneanarea, document differential displacements within the orogens rimmingthe Tyrrhenian Sea. Within the Southern Apennines, GPSvelocities define two laterally juxtaposed belts of deformation, withtranspression in the east and transtension in the west. In the east,~8 mm/yr convergence between northern Murge-Gargano block andthe International GPS System (IGS) site MATE is partitioned across~east-west striking right-lateral faults, consistent with seismicityand with the offshore geological record. To the south, in northernCalabria, site velocities relative to MATE indicate transpression at~5 mm/yr, not recorded by seismicity but consistent with the on-landand offshore geological record. In contrast, site velocities along theTyrrhenian Sea coast to the west diverge from MATE at 2-3.5 mm/yr,and are consistent with the crustal extension documented by seismicityand fault slip studies. The transpressional belt is tracked southwardacross the Ionian Sea by oblique convergence of central Sicilysites (2-6 mm/yr) relative to the IGS site NOTO in the Hyblean block.North-western Sicily sites display clockwise rotation, a patternreflected in the geological and paleomagnetic record. Ssignificanthorizontal motion accompanies rotation in north-western Sicily andis probably accommodated by west-northwest – east-southeast andnortheast-southwest-striking right- and left-oblique faults, respectively,consistent with a regional ~north-northwest – south-southeasttrending shortening axis. The ~east-west striking belt of contractionalearthquakes observed offshore northern Sicily is consistent with upto ~10 mm/yr geodetic convergence between Sicily and Sardinia.Southern Sardinia sites exhibits differential velocities relative to theIGS site CAGL, suggesting internal deformation which is notrecorded by seismicity and might signal incipient fragmentation ofthe Sardinia margin in response to relative convergence with Sicily.

KW - GPS velocities

KW - Sicily

KW - Southern Italy

KW - active orogenic deformation

KW - southern Sardinia

KW - transpression and transtension fronts

UR - http://hdl.handle.net/10447/41687

M3 - Article

VL - 127

SP - 299

EP - 316

JO - Bollettino della Societa Geologica Italiana

JF - Bollettino della Societa Geologica Italiana

SN - 0037-8763

ER -