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Titolo:
Intraplate deformation in western Europe deduced from an analysis of the International Terrestrial Reference Frame 1997 (ITRF97) velocity field
Autore:
Nocquet, JM; Calais, E; Altamimi, Z; Sillard, P; Boucher, C;
Indirizzi:
CNRS, F-06560 Valbonne, France CNRS Valbonne France F-06560CNRS, F-06560 Valbonne, France Inst Geog Natl, Lab Rech Geodesie, F-77455 Marne La Vallee, France Inst Geog Natl Marne La Vallee France F-77455 55 Marne La Vallee, France
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
fascicolo: B6, volume: 106, anno: 2001,
pagine: 11239 - 11257
SICI:
0148-0227(20010610)106:B6<11239:IDIWED>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
GLOBAL POSITIONING SYSTEM; BASE-LINE INTERFEROMETRY; CURRENT PLATE MOTIONS; NORTH AMERICA MOTION; LOWER RHINE GRABEN; GEODETIC CONSTRAINTS; CRUSTAL DEFORMATION; STATISTICAL TESTS; GPS OBSERVATIONS; TYRRHENIAN AREA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
83
Recensione:
Indirizzi per estratti:
Indirizzo: Nocquet, JM CNRS, 250 Rue A Einstein, F-06560 Valbonne, France CNRS 250 Rue A Einstein Valbonne France F-06560 bonne, France
Citazione:
J.M. Nocquet et al., "Intraplate deformation in western Europe deduced from an analysis of the International Terrestrial Reference Frame 1997 (ITRF97) velocity field", J GEO R-SOL, 106(B6), 2001, pp. 11239-11257

Abstract

Although tectonic deformation in western Europe is essentially concentrated in the Appenines and Alpine (Alps, Pyrenees) mountain ranges, several large historical and instrumentally recorded earthquakes (M >6) are known in the supposedly "stable" part of Europe. Because of its accuracy and internalconsistency at a global scale, the International Terrestrial Reference Frame 1997 (ITRF97) velocity field allows testing of intraplate rigidity in western Europe at a millimeter per year level. Using the full statistical information available on the ITRF97 velocities, we identify a subset of sites located in central Europe that satisfies a rigid cap rotation with residualvelocities <1 mm/yr and therefore provide a stable europe reference frame (SERF). In this reference frame we find residual velocities at European ITRF sites that are consistent with known active tectonic features. We identify a northward motion at. sites located in Italy, with internal deformation of the Adriatic block rather than rigid plate motion and a westward motion of the westernmost part of Europe of the order of 1-2 mm/yr relative to central Europe. The relative motion of the Adriatic block and western Europe agrees with the current extension known in the Tyrrhenian sea and the Apennines, III central Europe, we find active deformation <1 mm/yr in the easternAlps and western Carpathians. In the Alpine range our results indicate E-Wextension across the western Alps and N-S compression across the central and eastern Alps, in agreement with the strain regime deduced from seismotectonic observations, In Belgium and the Netherlands we find residual velocities of 1-1.5 mm/yr to the northwest at all the sites, most likely accommodated along the Upper and Lower Rhine Graben structures. An important outcomeof this study is the identification of internal deformation of the order of 1-2 mm/yr in an area usually interpreted as "stable" Europe. This result should be further checked as new, denser, and more accurate space geodetic data sets with longer observation time spans, become available for Europe.

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Documento generato il 27/01/20 alle ore 01:17:40