Intraplate deformation in western Europe deduced from an analysis of the International Terrestrial Reference Frame 1997 (ITRF97) velocity field

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 internal consistency 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 residual velocities <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. In central Europe, we find active deformation <1 mm/yr in the eastern Alps and western Carpathians. In the Alpine range our results indicate E-W extension 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 outcome of 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.

[1]  Richard G. Gordon,et al.  Statistical tests of additional plate boundaries from plate motion inversions , 1984 .

[2]  J. Ritz.  Evolution du champ de contraintes dans les Alpes du Sud depuis la fin de l'Oligocène : implications sismotectoniques , 1991 .

[3]  H. Philip.  Plio-Quaternary evolution of the stress field in Mediterranean zones of subduction and collision , 1987 .

[4]  Richard G. Gordon,et al.  No-net-rotation model of current plate velocities incorporating plate motion model NUVEL-1 , 1991 .

[5]  G. Panza,et al.  Upper mantle properties of the Tuscan-Tyrrhenian area: A framework for its recent tectonic evolution , 1991 .

[6]  W. Reilly,et al.  Crustal strain in Switzerland 1870–1970 , 1990 .

[7]  Richard G. Gordon,et al.  Current plate motions , 1990 .

[8]  C. Demets.  A reappraisal of seafloor spreading lineations in the Gulf of California: Implications for the transfer of Baja California to the Pacific Plate and estimates of Pacific-North America Motion , 1995 .

[9]  Robert M. Owen,et al.  Statistical Tests for Closure of Plate Motion Circuits (Paper 7L7161) , 1987 .

[10]  James Jackson,et al.  Active tectonics of the Adriatic Region , 1987 .

[11]  S. Stein,et al.  Global Tectonics and Space Geodesy , 1992, Science.

[12]  R. Sabadini,et al.  Modern tectonic regime in the Tyrrhenian area: observations and models , 1997 .

[13]  Robert W. King,et al.  Global Positioning System measurements from eastern Tibet and their implications for India/Eurasia intercontinental deformation , 2000 .

[14]  R. Lacassin,et al.  The Basel 1356 earthquake: which fault produced it? , 1994 .

[15]  Present-day deformation of the French northwestern Alps/southern Jura mountains: comparison between historical triangulations , 1994 .

[16]  F. Jouanne,et al.  Déformation verticale actuelle dans la partie sud du fossé d'Alsace (France) , 1998 .

[17]  C. Boucher,et al.  The ITRF96 realization and its associated velocity field , 1998 .

[18]  Wen-yao Zhu,et al.  Global plate motion models incorporating the velocity field of ITRF96 , 1999 .

[19]  T. James,et al.  A comparison of VLBI data with the Ice‐3G Glacial Rebound Model , 1993 .

[20]  S. Stein,et al.  Decelerating Nazca‐South America and Nazca‐Pacific Plate motions , 1999 .

[21]  A. Rius,et al.  Relative motions in Europe studied with a geodetic VLBI network , 1994 .

[22]  É. Calais,et al.  Continuous GPS measurements across the Western Alps, 1996–1998 , 1999 .

[23]  L. Rivera,et al.  Stress tensor determination in France and neighbouring regions , 1993 .

[24]  Yehuda Bock,et al.  Southern California permanent GPS geodetic array: Error analysis of daily position estimates and site velocities , 1997 .

[25]  F. Thouvenot.  Aspects géophysiques et structuraux des Alpes occidentales et de trois autres orogènes (Atlas, Pyrénées, Oural) , 1996 .

[26]  K. Feigl,et al.  GEODETIC MEASUREMENT OF TECTONIC DEFORMATION IN THE SOUTHERN ALPS AND PROVENCE, FRANCE, 1947-1994 , 1998 .

[27]  N. Pavoni.  Crustal Stresses Inferred from Fault-Plane Solutions of Earthquakes and Neotectonic Deformation in Switzerland , 1980 .

[28]  K. Bonjer.  Seismicity pattern and style of seismic faulting at the eastern borderfault of the southern Rhine Graben , 1997 .

[29]  C. Sue,et al.  Widespread extension in the core of the western Alps revealed by earthquake analysis , 1999 .

[30]  A. Frepoli,et al.  Contemporaneous extension and compression in the Northern Apennines from earthquake fault-plane solutions , 1997 .

[31]  K. Lambeck,et al.  Geological causes of recent (̃100 yr) vertical land movement in the Netherlands , 1998 .

[32]  Thierry Camelbeeck,et al.  Geological and geophysical evidence for large palaeo-earthquakes with surface faulting in the Roer Graben (northwest Europe) , 1998 .

[33]  D. Albarello,et al.  Tectonic interpretation of large scale geodetic measurements (VLBI, SLR) in the Central Mediterranean region: constraints and uncertainties , 1995 .

[34]  Guy Ouillon,et al.  The instrumental seismicity of the western Alps: spatio–temporal patterns analysed with the wavelet transform , 1998 .

[35]  T. Dixon,et al.  GPS geodetic constraints on Caribbean‐North America Plate Motion , 2000 .

[36]  Maurizio Ripepe,et al.  The 1997 Umbria‐Marche, Italy, Earthquake Sequence: A first look at the main shocks and aftershocks , 1998 .

[37]  W. Peltier.  VLBI baseline variations from the Ice-4G Model of postglacial rebound , 1995 .

[38]  W. Reilly,et al.  Crustal strain in Friuli 1949-1977 , 1987 .

[39]  W. N. Venables,et al.  Estimation of Variance Components and Applications. , 1990 .

[40]  T. Camelbeeck,et al.  Late Quaternary earthquake-related soft-sediment deformation along the Belgian portion of the Feldbiss Fault, Lower Rhine Graben system , 1999 .

[41]  Richard G. Gordon,et al.  Evidence for motion between Nubia and Somalia along the Southwest Indian ridge , 1999, Nature.

[42]  Michael B. Heflin,et al.  Plate motion and crustal deformation estimated with geodetic data from the Global Positioning System , 1995 .

[43]  Arthur L. Lerner-Lam,et al.  Geodetic constraints on the rigidity and relative motion of Eurasia and North America , 2000 .

[44]  Robert W. King,et al.  Global Positioning System measurements of present‐day crustal movements in the Arabia‐Africa‐Eurasia plate collision zone , 1997 .

[45]  É. Calais,et al.  Crustal strain in the Southern Alps, France, 1948–1998 , 2000 .

[46]  Steven N. Ward,et al.  Constraints On the Seismotectonics of the Central Mediterranean From Very Long Baseline Interferometry , 1994 .

[47]  K. Lambeck,et al.  Natural causes of recent (~100 yr) vertical land movement in the Netherlands. , 1998 .

[48]  M. Cushing,et al.  Atlas of macroseismic maps for French earthquakes with their principal characteristics , 1994 .

[49]  M. Kasser,et al.  Global Positioning System Network monitors the western Alps , 1995 .

[50]  J. Ritz.  Tectonique récente et sismotectonïque des Alpes du Sud : analyses en termes de contraintes , 1992 .

[51]  D. Argus,et al.  Tests of the rigid-plate hypothesis and bounds on intraplate deformation using geodetic data from very long baseline interferometry , 1996 .

[52]  R. Bayer,et al.  Regal : réseau GPS permanent dans les Alpes occidentales. Configuration et premiers résultats , 2000 .

[53]  G. J. Mets,et al.  Crustal deformations in the Mediterranean Area computed from SLR and GPS observations , 1996 .

[54]  H. Philip,et al.  Modern tectonic stress field in the Mediterranean region: evidence for variation in stress directions at different scales , 1992 .

[55]  John Langbein,et al.  Correlated errors in geodetic time series: Implications for time‐dependent deformation , 1997 .

[56]  T. Dumont,et al.  First paleomagnetic data from the sedimentary cover of the French Penninic Alps: evidence for Tertiary counterclockwise rotations in the Western Alps , 1999 .

[57]  David E. Smith,et al.  Horizontal crustal motion in the central and eastern Mediterranean inferred from satellite laser ranging measurements , 1994 .

[58]  T. Dixon,et al.  Noise in GPS coordinate time series , 1999 .

[59]  D. Jongmans,et al.  Active faulting and paleoseismology along the Bree fault, lower Rhine graben, Belgium , 2000 .

[60]  T. Dixon,et al.  New kinematic models for Pacific‐North America motion from 3 Ma to present, I: Evidence for steady motion and biases in the NUVEL‐1A Model , 1999 .

[61]  A. Ghafiri,et al.  Paleoseismicity in France: Fault trench studies in a region of moderate seismicity , 1997 .

[62]  Richard G. Gordon,et al.  Effect of recent revisions to the geomagnetic reversal time scale on estimates of current plate motions , 1994 .

[63]  T. Dixon,et al.  Relative motion between the Caribbean and North American plates and related boundary zone deformation from a decade of GPS observations , 1998 .

[64]  Jean-François Crétaux,et al.  Present‐day tectonic plate motions and crustal deformations from the DORIS space system , 1998 .

[65]  D. Jackson,et al.  Contemporary crustal deformation in east Asia constrained by Global Positioning System measurements , 2000 .

[66]  H. Philip,et al.  Le séisme du 26 décembre 1989 en Méditerranée, au large de la Côte d'Azur : tectonique active en compression, perturbation de contraintes et inversion tectonique au niveau d'une marge continentale , 1990 .

[67]  S. Stein,et al.  How rigid is the stable interior of the North American Plate , 1996 .

[68]  P. Delpech,et al.  Intraplate seismicity : new seismotectonic data in Western Europe , 1990 .

[69]  Jeffrey T. Freymueller,et al.  Global Plate Velocities from the Global Positioning System , 1997 .