Abstract
Recent and historical seismicity as well as reliable fault plane solutions are used to study the active deformation caused by the occurrence of intermediate depth (60–170 km) earthquakes of the Vrancea region, Rumania. In this area, located in the southeastern part of the Carpathian arc, the westward subduction of the Carpathian trench has terminated, leaving continental lithosphere, at present, at the arc. The principalT axis of the intermediate depth events trends N159°E and has a plunge of 74°, which is the same as the dip of the subducted plate. TheP axis has a trend of 314° and a shallow plunge of 15°. The analysis of the moment tensor of six focal mechanisms showed that the dominant mode of deformation of the subducted lithosphere is a down-dip extension at a rate of about 2 cm/yr, based on seismicity data.
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References
Aki, K., andRichards, P.,Quantitative Seismology, 2 volumes (W. H. Freeman & Co., San Francisco 1980).
Bleahu, M., Boccaletti, M., Manetti, P., andPeltz, S. (1973),Neogene Carpathian Arc: A Continental Arc Displaying the Features of an “Island Arc,” J. Geophys. Res.78, 5025–5032.
Comninakis, P., andPapazachos, B. (1978),A Catalogue of Earthquakes in the Mediterranean and the Surrounding Area for the Period 1901–1975, Publ. No. 5 of the Geophysical Lab., University of Thessaloniki.
Constantinescu, L., andEnescu, D. (1964),Fault Plane Solutions for Some Rumanian Earthquakes and their Seismotectonic Implications, J. Geophys. Res.69, 667–674.
Constantinescu, L., Ruprechtova, L., andEnescu, D. (1966),Mediterranean-Alpine Earthquake Mechanisms and their Seismotectontic Implications, Geophys. J. R. Astr. Soc.10, 347–368.
Dziewonski, A., andWoodhouse, J. (1983),An Experiment in Systematic Study of Global Seismicity: Centroid-moment Tensor Solutions for 201 Moderate and Large Earthquakes of 1981, J. Geophys. Res.88, 3247–3271.
Dziewonski, A., Ekström, G., Franzen, J., andWoodhouse, J. (1987),Centroid-moment Tensor Solutions for January–March 1986, Phys. Earth Planet. Int.45, 1–10.
Giardini, D. (1984),Systematic Analysis of Deep Seismicity: 200 Centroid-moment Tensor Solutions for Earthquakes between 1977 and 1980, Geophys. J. R. Astr. Soc.77, 883–914.
Gutenberg, B., andRichter, C.,Seismicity of the Earth and Associated Phenomena (Hafner Publ. Co., New York 1954).
Jackson, J., andMcKenzie, D. (1988),The Relationship between Plate Motions and Seismic Moment Tensors, and the Rates of Active Deformation in the Mediterranean and Middle East, Geophys. J. Int.93, 45–73.
Iosif, S., Prochazkova, D., andIosif, T. (1979),Seismic Source Parameters of Large Earthquakes in Vrancea, Tectonophysics,53, 195–201.
Isacks, B., andMolnar, P. (1971),Distribution of Stresses in the Descending Lithosphere from a Global Survey of Focal Mechanism Solutions of Mantle Earthquakes, Rev. Geophys. Space Phys.9, 103–174.
Kanamori, H., andAnderson, D. (1975),Theoretical Basis of Some Empirical Relations in Seismology, Bull. Seismol. Soc. Am.65, 1073–1095.
Karnik, V.,Seismicity of the European Area. Part I (Reidel Publ. Co., Dordrecht, Holland 1969).
Karnik, V.,Seismicity of the European Area. Part II (Reidel Publ. Co., Dordrecht, Holland 1971).
Kiratzi, A. (1991),Rates of Crustal Deformation in the North Aegean Trough-North Anatolian Fault Deduced from Seismicity, Pure Appl. Geophys.136 (3), 421–432.
Kiratzi, A. (1992),A Study on the Active Crustal Deformation on the North and East Anatolian Fault Zones, Tectonophysics, in press.
Kiratzi, A. (1993),Active Deformation of the Italian Peninsula and Sicily, submitted for publication.
Kiratzi, A., andPapazachos, C. (1992),Active Deformation in the Southern Aegean Benioff Zone, submitted for publication.
Kostrov, V. (1974),Seismic Moment and Energy of Earthquakes, and Seismic Flow of Rock, Izv. Acad. Sci. USSR Phys. Solid Earth1, 23–44.
Molnar, P. (1979),Earthquake Recurrence Intervals and Plate Tectonics, Bull. Seismol. Soc. Am.69, 115–133.
Mueller, G., Bonjer, K. P., Stockl, H., andEnescu, D. (1978),The Romanian Earthquake of March 4, 1977, I: Rupture Process Inferred from Fault Plane Solution and Multiple Event Analysis, J. Geophys.44, 203–218.
Oncescu, M. (1984),Deep Structure of the Vrancea Region, Rumania, Inferred from Simultaneous Inversion for Hypocenters and 3-D Velocity Structure, Ann. Geophys.,2, 23–28.
Papazachos, C., andKiratzi, A. (1992),A Formulation for Reliable Estimation of Active Crustal Deformation and its Application to Central Greece, Geophys. J. Int.111, 424–432.
Papazachos, C., Kiratzi, A., andPapazachos, B. (1992)Rates of Active Crustal Deformation in the Aegean and the Surrounding Area, J. Geodynamics16, 147–179.
Purcaru, G. (1979),The Vrancea, Rumania, Earthquake of March 4, 1977: A Quite Successful Prediction, Phys. Earth Planet. Int.18, 274–287.
Purcaru, G., andSpence, B. (1989),Deformation at the SE Carpathian Arc, Rumania, USGS File report20 (2), p. 8.
Radu, C., andPurcaru, G. (1964),Considerations upon Intermediate Earthquake-generating Stress Systems in Vrancea, Bull. Seismol. Soc. Am.54, 79–85.
Radu, C., andOncescu, M. (1985),Temporal Variation of Focal Mechanism of Vrancea Earthquakes, Earthq. Pred. Res.1, 141–146.
Roman, C. (1970),Seismicity in Rumania—Evidence for the Sinking Lithosphere, Nature228, 1176–1178.
Shebalin, N., Karnik, V., andHadzievski, D., eds. (1974),Catalogue of Earthquakes of the Balkan Region, UNDP/UNESCO Survey Seismicity Balkan Region, Skopje, 600 pp.
Sipkin, S., andNeedham, R. (1989),Moment-tensor Solutions Estimated Using Optimal Filter Theory: Global Seismicity, 1984–1987, Phys. Earth and Planet. Int.57, 233–259.
Trifu, C. (1990),Detailed Configuration of Intermediate Depth Seismicity in Vrancea Region, Rev. Geofisica46, 33–40.
Trifu, C., Deschamps, A., Radulian, M., andLyon-Caen, H.,The Vrancea earthquake of May 30, 1990: An estimate of the source parameters. InProc. of the XXII ESC General Assembly (Barcelona, 1990) pp. 449–454.
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Kiratzi, A.A. Active deformation in the Vrancea region, Rumania. PAGEOPH 140, 391–402 (1993). https://doi.org/10.1007/BF00876961
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DOI: https://doi.org/10.1007/BF00876961