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Active and recent deformation at the Southern Alps – Ligurian basin junction

Published online by Cambridge University Press:  01 April 2016

C. Larroque ,
N. Béthoux ,
E. Calais ,
F. Courboulex ,
A. Deschamps ,
J. Déverchère ,
J.-F. Stéphan ,
J.-F. Ritz  and
E. Gilli
C. Larroque
Affiliation:
UMR Géosciences Azur, CNRS-Univ. de Nice Sophia Antipolis, 250 av. Einstein, 06560 Valbonne, France Laboratoire de Sciences de la Terre, Univ. de Reims, CRA, 2 esplanade R. Garros, 51100 Reims, France
N. Béthoux
Affiliation:
UMR Géosciences Azur, CNRS-Univ. de Nice Sophia Antipolis, 250 av. Einstein, 06560 Valbonne, France
E. Calais
Affiliation:
UMR Géosciences Azur, CNRS-Univ. de Nice Sophia Antipolis, 250 av. Einstein, 06560 Valbonne, France
F. Courboulex
Affiliation:
UMR Géosciences Azur, CNRS-Univ. de Nice Sophia Antipolis, 250 av. Einstein, 06560 Valbonne, France
A. Deschamps
Affiliation:
UMR Géosciences Azur, CNRS-Univ. de Nice Sophia Antipolis, 250 av. Einstein, 06560 Valbonne, France
J. Déverchère
Affiliation:
UMR Géosciences Azur, CNRS-Univ. de Nice Sophia Antipolis, 250 av. Einstein, 06560 Valbonne, France
J.-F. Stéphan
Affiliation:
UMR Géosciences Azur, CNRS-Univ. de Nice Sophia Antipolis, 250 av. Einstein, 06560 Valbonne, France
J.-F. Ritz
Affiliation:
UMR Laboratoire de Géophysique, Tectonique et Sédimentologie, CNRS-Univ. de Montpellier II, 34095 Montpellier cedex 5, France
E. Gilli
Affiliation:
Centre d’Etude du Karst, 13 rue Massena, 06000 Nice, France
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Abstract

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The Southern Alps – Ligurian basin junction is one of the most active seismic areas in Western Europe countries. The topographic and the structural setting of this region is complex because of (i) its position between the high topography of the Southern Alps and the deep, narrow Ligurian oceanic basin, and (ii) the large number of structures inherited from the Alpine orogeny. Historical seismicity reveals about twenty moderate-size earthquakes (up to M=6.0), mostly distributed along the Ligurian coast and the Vésubie valley. A recent geodetic experiment shows a significant strain rate during the last 50 years in the area between the Argentera massif and the Mediterranean coastline. Results of this experiment suggest a N-S shortening of about 2-4 mm/yr over the network, this shortening direction is consistent with the seismological (P-axes of earthquakes) and the microtectonic data. The Pennic front (E-NE of the Argentera massif) and the northern Ligurian margin are the most seismically active areas. In the Nice arc and in the Argentera massif, some seismic lineaments correspond to faults identified in the field (such as theTaggia-Saorge fault or the Monaco-Sospel fault). In the western part of the Alpes Maritimes, no seismic activity is recorded in the Castellane arc. In the field, geological evidence, such as offsets of recent alluvial sediments, recent fault breccia, speleothem deformations, radon anomalies and others indicates recent deformation along these faults. Nevertheless, to this date active fault scarps have not been identified: this probably results from a relatively high erosion rate versus deformation rate and from the lack of Quaternary markers. We also suspect the presence of two hidden active faults, one in the lower Var valley (Nice city area) and the other one at the base of the Argentera crustal thrust-sheet. Offshore, along the northern Ligurian margin, the seismic reflection data shows traces of Quaternary extensional deformation, but the accuracy of the data does not yet allow the construction of a structural map nor does it allow the determination of the continuity between the offshore and onshore structures. From these data set we propose a preliminary map of 11 active faults and we discuss the questions which remain unsolved in the perspective of seismic hazard evaluations.

Keywords

Active faulthidden faulthistorical seismicityLigurian basinQuaternary deformationseismic hazardSouthern
Type
Research Article
Information
Netherlands Journal of Geosciences , Volume 80 , Issue 3-4 , December 2001 , pp. 255 - 272
Copyright
Copyright © Stichting Netherlands Journal of Geosciences 2001

References

Augliera, P., Béthoux, N., Déverchère, J. & Eva, C., 1994. The Ligurian Sea: new seismotectonic evidence. Boll. Geofis. Teorica Appl., XXXVI (141–144), 363–380.Google Scholar
Azzaro, R., 1999. Earthquake surface faulting at the Mount Etna volcano (Sicily) and implications for active tectonics. J. of Geodynamics, 28, 193–213.CrossRefGoogle Scholar
Basili, R., Bosi, V., Galadini, F., Galli, P., Meghraoui, M., Messina, P., Moro, M. & Sposato, A., 1998. The Colfiorito earthquake sequence of september-october 1997: surface breaks and seismotectonic implications for the Central Apennines (Italy). J. of Earth. Eng., 2, 291–302.Google Scholar
Baubron, J.C., 1987. Compte rendu détaillé, Argentera (Alpes Italiennes). BRGM, diffusion délégation Risques Majeurs, 3 pp.Google Scholar
Baroux, E., Béthoux, N. & Bellier, O., 2000. Analyses of the stress field in southeastern France from earthquake focal mechanisms. In press Geophys. J. Int.CrossRefGoogle Scholar
Bigot-Cormier, F., Poupeau, G. & Sosson, M., 2000. Differential denudations of the Argentera external crystalline massif (SE France) reavaled by fission tracks thermochronology (zircons, apatites). C. R. Acad. Sci. Paris, 330, 363–370.Google Scholar
Béthoux, N., Cattaneo, M., Delpech, P.Y., Eva, C., & Réhault, J.P., 1988. Mécanismes au foyer de séismes en mer Ligure et dans le Sud des Alpes occidentales: résultats et interprétations. C. R. Acad. Sci. Paris, 307, 71–77.Google Scholar
Béthoux, N., Fréchet, J., Guyoton, F. Thouvenot, F., Cattaneo, M., Eva, C., Nicolas, M., & Granet, M., 1992. A closing Ligurian sea, Pure Appl. Geoph., 139, 179–194.Google Scholar
Béthoux, N., Ouillon, G. & Nicolas, M., 1998. The instrumental seismicity of the western Alps: Spatio-temporal pattern. Geophys. J. Int., 135, 177–194.Google Scholar
Borchielini, S., Campredon, R. & Bernat, M., 1991. Ground variation of Radon 222 for location of hidden structural features. Example of the South of France (Alpes Maritimes). Pageoph., 135, 625–638.Google Scholar
Boschi, E., Ferrari, G., Gasperini, P., Guidoboni, E., Smriglio, G. & Valensise, G., 1995. Catalogo dei forti terremoti in Italia dal 461 a.C. al 1980. Istituto Nazionale di Geofisica-Storia Geofísica Ambiente, Bologna, 973 pp.Google Scholar
Boschi, F., Guidoboni, E., Ferrari, G., Valensise, G. & Gasperini, P., 1997. The catalogue of strong Italian Earthquakes on the web. http://storing.ingrm.it/cft/.Google Scholar
Bossolasco, M. & Eva, C., 1965. Il terremoto del 19 luglio 1963 nel mar Ligure. Geofis. e Meteor., 14, 6–18.Google Scholar
Bulard, P.F., Chamagne, B., Dardeau, G., Delteil, J., Gioan, P., Ivaldi, J.P., Laval, F., Perez, J.L. & Polvèche, J., 1975. Sur la genèse et les structures de Tare de Nice. Bull. Soc. Géol. de France, XVII.CrossRefGoogle Scholar
Cabrera, J. & Sébrier, M., 1998. Surface rupture associated with a 5.3 mb earthquake: the 5 April 1986 Cuzco earthquake and kinematics of the Chincheros-Qoricocha faults of the High Andes, Peru. Bull. Seism. Soc. Am., 88, 242–255.Google Scholar
Calais, E., Galisson, L., Stéphan, J.F., Delteil, J., Déverchère, J., Lar-roque, C., Mercier de Lépinay, B., Popoff, M. & Sosson, M., 2000. Crustal strain in the southern Alps, France, 1948–1998. Tectonophysics, 319, 1–17.Google Scholar
Camelbeeck, T., Martin, H., Vanneste, K., Meghraoui, M., Verbeeck, K. & Brondeel, M., 2000. Geomorphic evidence of active faulting in slow deformation area: the exemple of the Lower Rhine Embayment. Workshop «Evaluation of the potential for large earthquakes in region of present-day low seismic activity in Europe», Han sur Lesse, 13–17 March 2000, abstract volume, 31–34.Google Scholar
Chaumillon, E., Deverchère, J., Rénault, J.P. & Gueguen, E., 1994. Réactivation tectonique et flexure de la marge continentale Ligure (Méditerranée Occidentale). C.R. Acad. Sc, Paris, 319, 675–682.Google Scholar
Clauzon, G., Rubino, J.L. & Suc, J.P., 1996. Les rias pliocènes du Var et de Ligurie: comblement sédimentaire et évolution géodynamique. Field trip book of the Groupe Français d’Etude du Néogène/Groupe Français de Géomorphologie, 36p.Google Scholar
Combes, P., 1984. La tectonique récente de la Provence occidentale: microtectonique, caractéristiques dynamiques et cinématiques. Méthodologie de zonation tectonique en relation avec la sismicité. Thèse de doctorat, Univ. de Strasbourg, 182 pp.Google Scholar
Cosani, L., 1997. Neotectonique et heritage structural entre massif du Mercantour et marge ligure: le secteur de Saorge-Taggia. Géologie Alpine, 128–134.Google Scholar
Courboulex, F, Deschamps, A., Cattaneo, M., Costi, F., Deverchère, J., Virieux, J., Augliera, P., Lanza, V. & Spallarossa, D., 1998. Source study and tectonic implications of the 1995 Ventimiglia (border of Italy and France) earthquakes (ML=4.7). Tectonophysics, 290, 245–257.Google Scholar
Courboulex, F., Duval, A.M., Lomax, A., Deschamps, A. & Larroque, C., 2000. Les enseignements du petit séisme de Peille (Mw=3.4) du 1er novembre 1999 (Alpes Maritimes, France). Congrès Riviera 2000 «Tectonique active et géomorphologie» 18–22 octobre 2000, Villefranche sur Mer, abstract volume, 11.Google Scholar
DeMets, C., Gordon, R.G., Argus, D.F. & Stein, S., 1994. Effect of recent revisions to the geomagnetic reversal time scale on estimates of current plate motions. Geophys. Res. Letters, 21, 2191–2194.Google Scholar
Dubar, M., & Perez, J.L., 1989. Quaternary neotectonics bordering on the subalpine ‘Arc de Nice’. CR. Acad Sci., Paris, 308, 1485–1490.Google Scholar
Dubar, M., Gugliemi, Y. & Falgueres, C., 1992. Néotectonique et sédimentation côtière quaternaire en bordure de Tare subalpin de Nice (Alpes Maritimes, France). Quaternaire, 3, (3–4), 105–110.Google Scholar
Dubar, M. & Gugliemi, Y., 1996. Morphogenèse et mouvements verticaux quaternaires en bordure de l’arc de Nice, essai de quantification. Rev. d’Anal. Spatiale Quant. App., 38, 21–27.Google Scholar
Duval, A.M., 1996. Détermination de la réponse d’un site aux séismes à l’aide du bruit de fond: évaluation expérimentale. Thèse de doctorat de l’Univ. Paris VI, 265 pp.Google Scholar
Eva, C. & Rabinovich, A.B., 1997. The Febuary 23, 1887 tsunami recorded on the Ligurian coast, western Mediterranean. Geophys. Res. Lett., 24, 2211–2214.Google Scholar
Eva, C., Augliera, P., Burgisi, C., Eva, E., Solarino, S. & Spallarossa, D., 2000. New evidences on the seismotectonics of the Saorge-Taggia Line from analysis of the recent seismicity. Europ. Geophys. Soc. 25th general assembly, 26–29 April, Nice.Google Scholar
Fauquette, S., Clauzon, C., Sue, J.P. & Zheng, Z., 1999. A new approach for palaeoaltitude estimates based on pollen records: example of the Mercantour Massif (southeastern France) at the earliest Pliocene. Earth Planet. Sci. Lett., 170, 35–47.Google Scholar
Ferhat, G., Feigl, K., Ritz, J.F. & Souriau, A., 1998. Geodetic measurement of tectonic deformation in the southern Alps and Provence, France, 1887–1994. Earth Planet. Sci. Lett., 159, 35–46.Google Scholar
Ferrari, G., 1991. The 1887 Ligurian earthquake: A detailed study from contemporary scientific observations. Tectonophysics, 193, 131–139.CrossRefGoogle Scholar
Gaffet, S., Larroque, C., Deschamps, A. & Tressols, K., 1998. Dense array experiment for observation of waveform perturbation induced by local structure diffraction. Soil Dynamics and Earthquake Engineering, 17, 475–484.Google Scholar
Gèze, B. & Lanteaume, M., 1963. Carte géologique de Menton-Nice, Editions BRGM.Google Scholar
Ghafiri, A., 1995. Paléosismicité de failles actives en contexte de sismiche modérée: application à l’évaluation de l’aléa sismique dans le Sud-Est de la France. Thèse de doctorat, Univ. Paris XI, 373 pp.Google Scholar
Gidon, M., 1977. Notice de la carte géologique de Larche, 1/50 000. Ed. BRGM.Google Scholar
Gidon, M. & Pairis, J.L., 1992. Relations entre le charriage de la Nappe de Digne et la structure de son autochtone dans la vallée du Bès (Alpes de Haute-Provence, France). Eclogae Geol. Helv., 85/2, 327–359.Google Scholar
Gilli, E., 1981. Néotectonique dans les massifs karstiques. D.E.A. Univ. Aix-Marseille, 78 pp.Google Scholar
Gilli, E., 1986. Néotectonique dans les massifs karstiques, un exemple dans les préalpes de Nice: la grotte des Deux Gourdes. Karstologia, 8, FFS-AFK-CNRS, 50–52.Google Scholar
Gilli, E. & Delange, P., 1999. Recent slow and aseismic movement of an overthrust observed in the Abel sink hole (Saint-Vallier-de-Thiey, Alpes Maritimes, France). Geodynamica Acta, Colloque de Han sur Lesse 1998.Google Scholar
Grellet, B., Combes, P., Granier, T. & Philip, H., 1993. Sismotec-tonique de la France Métropolitaine dans son cadre géologique et géophysique. Mem. Soc. Géol. de France, 164, 76 pp.Google Scholar
Hoang-Trong, P. Haessler, H., Holl, J.M. & Legros, Y., 1987. L’essain sismique (oct. 83 – Jan. 84) de la moyenne vallée de la Roya (Alpes Maritimes): activité récente d’un ancien système de failles conjuguées? C.R. Acad. Sci. Paris, 304, 419–424.Google Scholar
Irr, F., 1984. Paléoenvironnements et évolution géodynamique néogènes et quaternaires de la bordure nord du Bassin Méditerranéen Occidental, un système de pente de la paléo-marge provençale. Thèse Université de Nice, 464 pp.Google Scholar
Klaucke, I., Savoye, B. & Cochonat, P., 2000. Patterns and processes of sediment dispersal on the continental slope off Nice, SE France. Marine Geol., 162, 405–422.Google Scholar
Labaume, P., Ritz, J.F. & Philip, H., 1989. Recent normal faults in the southwestern Alps: their relationships with the compression tectonics. C.R.Acad. Sci. Paris 308, série II, 1553–1560.Google Scholar
Lambert, J. & Levret, A., 1996. Mille ans de séismes en France. Ouest Editions Presses Académiques, Nantes, 120 pp.Google Scholar
Larroque, C., Gaffet, S., Cornou, C., Schissele, E., Bertrand, E., Béthoux, N., Bouchon, M., Corrazzi, M., Courboulex, F., Deschamps, A., Duval, A.M., Marón, C., Glot, J.R, Janod, F., Guiguet, R., Vidal, S. &Virieux, J., 1999. Une expérience multi-antennes à Annot pour l’analyse des effets de site en sismologie. C. R. Acad. Sci. Paris, 329, 167–174.Google Scholar
Larroque, C., Béthoux, N., Calais, E., Courboulex, F., Deschamps, A., Deverchère, J., Stéphan, J.F., Ritz, J.F. & Gilli, E., 2000. Joint Multidisciplinary studies of active faults and seismic hazard at the junction between southern French Alps and Ligurian basin. Abstract volume Paleosis, Han sur Lesse (Belgium), 13–17 march 2000, 89–92.Google Scholar
Laurent, O., 1998. Modalités de la structuration d’un prisme de front de chaîne: P example de l’arc de Castellane (chaînes subalpine Méridionales, France). PhD Thesis, Univ. Nice-Sophia Antipolis, 280 pp.Google Scholar
Laurenti, A., 1998. Les tremblements de terre des Alpes Maritimes. Serre, Editeur, Nice, 175 pp.Google Scholar
Lemoine, M., Dardeau, G., Delpech, P., Dumont, T., De Graciansky, C., Graham, R., Jolivet, L., Robert, D. & Tricart, P., 1989. Extension synrift et failles transformantes jurassiques dans les Alpes Occidentales. C.R. Acad. Sci. Paris, 309, 1711–1716.Google Scholar
Levret, A., Cushing, M. & Peyridieu, G., 1996. Etude des caractéristiques des séismes historiques en France. IPSN, Paris, 399 pp.Google Scholar
Masana, E., Villamarin, J.A., Sanchez Cabañero, J., Plaza J. & Santanach, P., 2000. Seismological behaviour of a fault with no historical seismicity: El Camp fault (northeastern Iberian peninsula). Workshop «Evaluation of the potential for large earthquakes in region of present-day low seismic activity in Europe», Han sur Lesse, 13–17 March 2000, abstract volume, 101–104.Google Scholar
Madeddu, B., Béthoux, N. & Stephan, J.F., 1996. Déformations et champs de contraintes récents à actuel dans les Alpes sud-occidentales: approche sismotectonique. Bull. Soc. Géol. de France, 167, 797–810.Google Scholar
McKenzie, D., 1969. The relation between fault plane solutions for earthquakes and the directions of the principal stresses. Bull. Seism. Soc. Am., 59, 591–601.CrossRefGoogle Scholar
Meghraoui, M., Bosi, V., & Camelbeek, T., 1999. Fault fragment control in the 1997 Umbria-Marche, central Italy, earthquake sequence. Geophys. Res. Lett., 26(8),1069–1072.Google Scholar
Nicolas, M., Béthoux, N. & Maddedu, B., 1998. Instrumental seismicity of the Western Alps. Pure Appl. Geophys., 152, 707–731.Google Scholar
Okada, Y., 1993. Surface deformation to shear and tensile faults in a half space. Bull. Seism. Soc. Am. 75, 148–142.Google Scholar
Perez, J.L., 1975. La zone limite entre l’arc de Nice et l’arc de la Roya (Alpes Maritimes). Bull. Soc. Géol. de France, 7, 930–938.Google Scholar
Rebaï, S., 1988. Le champ de contrainte actuel en Europe et dans les régions méditerranéennes. Etude du décrochement senestre plio-quaternaire de Laghet-Peille. D.E.A., Univ. de Montpellier, 36 pp.Google Scholar
Rebaï, S., Philip, H. & Taboada, A., 1992. Modern tectonic stress field in the Mediterranean region: evidence for variation in stress direction at different scales. Geophys. J. Int., 110, 106–140.Google Scholar
Ritz, J.F., 1991. Evolution du champ de contraintes dans les Alpes du Sud depuis la fin de l’Oligocene. Thèse de doctorat, Univ. de Montpellier, 187 pp.Google Scholar
Ritz, J.F., 1992. Tectonique récente et sismotectonique des Alpes du Sud, analyse en termes de contraintes. Quaternaire, 3, 111–124.Google Scholar
Saunders, I. & Young, A., 1983. Rate of surface processes on slopes, slope retreat and denudation. Earth Surf. Proc. and landforms, 8, 473–501.Google Scholar
Sauret, B. & Terrier, M., 1987. Compte rendu de mission Argentera. BRGM, note BS/GR 87, 175.Google Scholar
Schroetter, J.M., 1998. L’enregistrement sédimentale de la déformation mio-plio-quaternaire sur la bordure ouest de Fare de Nice: analyse sedimento-morpho-structurale. Géologie Alpine, 74, 146–149.Google Scholar
Siddans, A., Henry, P., Kligfield, B., Lowrie, W., Hirt, A. & Percevault, M., 1984. Finite strain patterns and their significance in permian rocks of the Alpes Maritimes (France). J. Struc.Geol., 6, 339–368.Google Scholar
Sue, C., Thouvenot, F., Fréchet, J. &Tricart, P., 1999. Widespread extension in the core of the Western Alps revealed by earthquake analysis. J. Geophys. Res., 104, 25611-25622.Google Scholar
Vogt, J., 1981. Carte sismotectonique de la France au 1/1 000 000. CEA/EDF/BRGM/ Ministère de l’Industrie, Mém. BRGM, 111.Google Scholar
Wells, D.L. & Coppersmith, K.J., 1994. New empirical relationships among magnitude, rupture length, rupture width, rupture area and surface displacement. Bull. Seism. Soc. Am., 84, 974–1002.Google Scholar
Westphal, M., Orsini, J. & Vellutini, P., 1976. Le microcontinent corso-sarde, sa position initiale, données paléomagnétiques et raccords géologiques. Tectonophysics, 30, 41–57.Google Scholar
Working Group CPTI, 1999. Catalogo paramétrico dei Terremoti Italiani. ING, GNDT, SGA, SSN, Bologna, 92pp. http://emidius.itim.mi.cnr.it/CPTI/home.html.Google Scholar